Most Importants Interview Questions of Fluid Mechanics in 2018..!!

Fluid mechanics Interview Questions & Answers

Question 1. How Cavitation Can Be Eliminated In A Pump?

Answer :
Cavitation means bubbles are forming in the liquid.
To avoid Cavitation, we have to increase the Pump size to One or Two Inch;
To increase the pressure of the Suction Head, or
Decrease the Pump Speed.


Question 2. Which Pump Is More Efficient Centrifugal Pump Or Reciprocating Pump?
Answer :
Centrifugal pump. Because flow rate is higher compared to reciprocating pump. Flow is smooth and it requires less space to install. Lower initial cost and lower maintenance cost.

Question 3. Why Centrifugal Pump Is Not Called As A Positive Displacement Type Of Pump?
Answer :
The centrifugal has varying flow depending on pressure or head, whereas the Positive Displacement pump has more or less constant flow regardless of pressure.
Likewise viscosity is constant for positive displacement pump where centrifugal pump have up and down value because the higher viscosity liquids fill the clearances of the pump causing a higher volumetric efficiency. When there is a viscosity change in supply there is also greater loss in the system. This means change in pump flow affected by the pressure change.
One more example is, positive displacement pump has more or less constant efficiency, where centrifugal pump has varying efficiency rate.

Question 4. Why The Centrifugal Pump Is Called High Discharge Pump?
Answer :
Centrifugal pump is a kinetic device. The centrifugal pump uses the centrifugal force to push out the fluid. So the liquid entering the pump receives kinetic energy from the rotating impeller. The centrifugal action of the impeller accelerates the liquid to a high velocity, transferring mechanical (rotational) energy to the liquid. So it discharges the liquid in high rate. It is given in the following formulae:
Centrifugal force F= (M*V2)/R.
Where,
M-Mass
V-Velocity
R-Radius

Question 5. Why Cavitation Will Occur In Centrifugal Pumps And Not In Displacement Pumps?
Answer :
The formation of cavities (or bubbles) is induced by flow separation, or non-uniform flow velocities, inside a pump casing. In centrifugal pumps the eye of the pump impeller is smaller than the flow area of pipe. This decrease in flow area of pump results in increase in flow rate. So pressure drop happened between pump suction and the vanes of the impeller. Here air bubbles or cavities are formed because of liquid vapour due to increase in temperature in impeller. This air bubbles are transmitted to pump which forms cavitation.

Question 6. What Is A Radialflow Turbine?
Answer :
In a radialflow turbine, steam flows outward from the shaft to the casing. The unit is usually a reaction unit, having both fixed and moving blades.

Question 7. What Are Four Types Of Turbine Seals?
Answer :
Carbon rings fitted in segments around the shaft and held together by garter or retainer springs.
Labyrinth mated with shaft serration’s or shaft seal strips.
Water seals where a shaft runner acts as a pump to create a ring of water around the shaft. Use only treated water to avoid shaft pitting.
Stuffing box using woven or soft packing rings that are compressed with a gland to prevent leakage along the shaft.

Question 8. What Are Two Types Of Clearance In A Turbine?
Answer :
Radial – clearance at the tips of the rotor and casing.
Axial – the foreandaft
clearance, at the sides of the rotor and the casing.

Question 9. What Is The Function Of A Thrust Bearing?
Answer :
Thrust bearings keep the rotor in its correct axial position.


Question 10. What Is A Stage In A Steam Turbine?
Answer :
In an impulse turbine, the stage is a set of moving blades behind the nozzle. In a reaction turbine, each row of blades is called a "stage." A single Curtis stage may consist of two or more rows of moving blades.

Question 11. What Is A Diaphragm?
Answer :
Partitions between pressure stages in a turbine’s casing are called diaphragms. They hold the vaneshaped nozzles and seals between the stages. Usually labyrinthtype seals are used. Onehalf of the diaphragm is fitted into the top of the casing, the other half into the bottom.

Question 12. What Are The Two Basic Types Of Steam Turbines?
Answer :
Impulse type.
Reaction type.

Question 13. What Are Topping And Superposed Turbines?
Answer :
Topping and superposed turbines arc highpressure, noncondensing units that can be added to an older, moderatepressure plant. Topping turbines receive highpressure steam from new highpressure boilers. The exhaust steam of the new turbine has the same pressure as the old boilers and is used to supply the old turbines.

Question 14. What Is A Combination Thrust And Radial Bearing?
Answer :
This unit has the ends of the Babbitt bearing extended radically over the end of the shell. Collars on the rotor face these thrust pads, and the journal is supported in the bearing between the thrust collars.

Question 15. What Is Cavitation?
Answer :
Cavitation is the formation of vapor cavities (Air bubbles) in a liquid.

Question 16. What Is Positive Displacement Pump?
Answer :
Positive displacement pumps are those that operate by forcing a fixed volume of fluid from the inlet pressure section of the pump into the discharge zone of the pump.

Question 17. What Is Kinematic Viscosity?
Answer :
The kinematic viscosity is the ratio of absolute viscosity to the density of the liquid.

Question 18. Differentiate Between The Uniform Flow And Non-uniform Flow?
Answer :
Uniform Flow: The flow is defined as uniform flow when in the flow field the velocity and other hydrodynamic parameters do not change from point to point at any instant of time.
Non-Uniform Flow: When the velocity and other hydrodynamic parameters changes from one point to another the flow is de􀃡ned as non-uniform flow.

Question 19. What Is The Difference Between The Unsteady Uniform Flow And Steady Uniform Flow?
Answer :
Unsteady uniform flow - changes with time.
Steady uniform flow - does not change with time.



Question 20. What Is Coefficient Of Contraction?
Answer :
Coefficient of contraction is the ratio of area of jet at vena contracta to the area of orifice.
The typical value may be taken as 0.64 for a sharp orifice (concentric with the flow channel). The smaller the value, the more effect the vena contracta has.

Data Link Protocol in Linux ....!!

High Level Data Link Protocol in Linux

X.25 was the first protocol suite to incorporate a generic Layer 2 protocol for its link layer definition. The generic family of Layer 2 protocols used for WANs are called High Level Data Link Protocols (HDLCs). Originally, when layered protocols were new, “high level” meant that the protocol was dealing with anything more abstract than the electrical details of physical transmission. HDLC is still the basis of many data communication protocols in common use today with the exception of ATM and optical protocols. There are a few variants on the basic theme of HDLC, and most of these variants are governed by ISO standards. However, there are also a few HDLC-type protocols specified by ITU and IEEE standards ISO 3300 and ISO 4335.See Table for a list of various HDLC derivative protocols. It is important to point out that although these HDLC variants are similar in the way they work, they do not expect interoperation between variants because the framing details are different.

HDLC Protocol Variants


HDLC Types and Configurations
This section shows the HDLC protocol in more detail. All the variants of HDLC are functionally similar. They might differ in the precise lengths of the address, control, or FCS fields, but this section is largely applicable to each variant. HDLC supports three types of stations and two types of configuration. The three types of stations are:

Primary: Controlling station on the link.

Secondary: Slaves to primary stations.

Combined: Act as either primary or secondary stations.
In addition to the three types of stations, HDLC specifies two types of configurations. The configurations can be thought of as modes of service. The two types of configurations are:

Balanced: In a balanced configuration, there are two stations connected with a point-to-point link. In this configuration, each station acts as a combined station.

Unbalanced: With the unbalanced configuration, there are two or more stations. One station acts as a primary station. Two or more other stations act as secondary stations. Figure illustrates the unbalanced configuration, and Figure shows the balanced configuration. With the balanced configuration, the stations are peers. Each station can send both commands and responses. The balanced configuration is used primarily for point-to-point links. In contrast, with the unbalanced configuration, the primary station is the controlling station on the link and the secondary stations are slaves. The primary station is the only one that can send commands, and the secondary stations answer with responses.

HDLC unbalanced configuration




Figure .HDLC balanced configuration.



HDLC Framing
As we have seen, there are many variants of HDLC. The HDLC framing detailed in this section shows framing that is generally common to all of the HDLC variants. Table shows HDLC framing that applies to most of the variants. There are three types of formats in an HDLC frame:

• Information format for carrying user data.
• Supervisory format for control functions.
• Unnumbered format forcontrol and management.

General HDLC Framing



The primary distinguishing factor for each type of frame is the control field. The control field has different values for each type of framing, which is determined by the first 2 bits in the control field. In the 8-bit control format, bit 5 is the poll/final bit. It is treated as the poll bit if it is part of a frame sent by the primary station, and it is called the final bit if it is encountered in a frame sent by the secondary station. Although the HDLC variants are similar, the specific use of the control field is somewhat different for each type of HDLC. For example, Section on PPP shows a specific variant of HDLC called LAPB. The control field can be either 8 or 16 bits in length. Tables and show the format of the Control field for each type of frame. Table shows the information format. This format is used to transmit user data. The “I” type frames or information frames are sequenced or numbered frames for providing a connection oriented service. The transmitted frames include sequence numbers, and the response frames include expected sequence numbers.

Information Format



Tableshows the supervisory format. This format is for control functions only, primarily acknowledgment and requests for retransmissions. Outgoing information frames are not sequenced, but the n(r) field might contain the number of an acknowledged frame.

Supervisory Format

The format for commands used with the supervisory format is shown in Table

Supervisory Format Commands



Table shows the unnumbered format of HDLC. This format is used for control functions and management functions such as link establishment. Table shows some key unnumbered format commands.

Unnumbered Format

Unnumbered Commands



------------------------------------------------------------------------------------------------------------------------

Asynchronous & Synchronous Data in Linux..!!!

Asynchronous Versus Synchronous Data Transmission in Linux

It is important to differentiate between asynchronous and synchronous methods of data transmission. Asynchronous data transmission has more overhead and doesn’t scale to higher rates the way synchronous methods do. The early methods discussed on the history of data communications were done by sending sequences of characters in a sequential linear fashion. If transmission is done this way, every character transmitted adds to the overhead. Each character has framing bits adding to the amount of data that needs to be transmitted. In addition, with asynchronous methods, there are no synchronizing external clock sources, nor are there are any synchronizing pulses embedded within the data stream. Each character is separately framed with start and stop bits. The receiving station must resynchronize on each character, which is why the maximum speeds are limited.
In contrast, synchronous data transmission methods don’t frame every character with individual start and stop bits. Instead, the characters are grouped together in sequence into frames, and the frames are transmitted as a stream of bits or characters. Each frame consists of a sequence of beginning bits or characters, followed by a data payload and then followed by a terminating sequence of bits or characters. The overhead is far higher for asynchronous methods and could be as high as 25% depending on the character length and how many framing bits there are for each character. However, the overhead for synchronous protocols is far lower and could be as little as 5%.

Flow
 Control and Reliable Transmission
Flow control and reliable transmission are really two topics. In this section, we discuss these topics in the context of low-level transmission control. At the lower layers, we are concerned with how to provide acknowledged frames for error recovery and sequenced delivery. In addition, we maintain queues at the transmission side to accumulate data waiting to be sent and provide an even flow of information. Before we begin, it is important to note that TCP/IP does not require either reliable or sequenced packet delivery service. TCP/IP is designed to work with LANs that don’t implement retransmission in the case of dropped packets at the lower layers.
The method of low-level flow control used is different with simple character-oriented protocols than when it is used with faster synchronous-oriented protocols. Character-oriented protocols in their simplest form provide the most basic method of flow control. The sending station must wait for an Acknowledge (ACK) from the receiving station before sending the next character. This mechanism is known as stop and wait acknowledgment. With this method, it is impossible to fully use the channel’s bandwidth because one station sometimes has to send empty sync characters or otherwise mark time while waiting to receive an acknowledgment of an earlier frame. This problem is solved with bit-synchronous protocols by using a technique called slidingwindows, which is far more efficient. The sliding windows technique has less overhead by using multiple acknowledgments where one ACK can collectively acknowledge multiple incoming frames. After sending the first frame, the sending station can continue to send additional frames without stopping to wait for the receiving station to acknowledge the first frame.
The data link layer typically provides a link status indication to be used with flow control. Queues of frames waiting for transmission are maintained below the network layer but above the data link layer. When the higher layer has a packet ready, it is added to the end of the queue. When the lower layer is ready to transmit a packet, it removes the next packet from the bottom of the queue. This ensures that higher layers continue processing independently from the lowerlayer link status.

Linux interview Questions

LINUX interview Question And Answers..

Question 1. What Is Linux Shell?
Answer :
Linux shell is a user interface used for executing the commands. Shell is a program the user uses for executing the commands. In UNIX, any program can be the users shell. Shell categories in Linux are:
Bourne shell compatible, C shell compatible, nontraditional, and historical.

Question 2. What Is Shell Script?
Answer :
A shell script, as the name suggests, is a script written for the shell. Script here means a programming language used to control the application. The shell script allows different commands entered in the shell to be executed. Shell script is easy to debug, quicker as compared to writing big programs. However the execution speed is slow because it launches a new process for every shell command executed. Examples of commands are cp, cn, cd.

Question 3. What Is Kernel? Explain The Task It Performs. 
Answer :
Kernel is used in UNIX like systems and is considered to be the heart of the operating system. It is responsible for communication between hardware and software components. It is primarily used for managing the systems resources as well.
Kernel Activities:
The Kernel task manager allows tasks to run concurrently.
Managing the computer resources: Kernel allows the other programs to run and use the resources.
Resources include i/o devices, CPU, memory.
Kernel is responsible for Process management. It allows multiple processes to run simultaneously allowing user to multitask.
Kernel has an access to the systems memory and allows the processes to access the memory when required.
Processes may also need to access the devices attached to the system. Kernel assists the processes in doing so.
For the processes to access and make use of these services, system calls are used.

Question 4. What Are Pipes? 
Answer :
A pipe is a chain of processes so that output of one process (stdout) is fed an input (stdin) to another. UNIX shell has a special syntax for creation of pipelines. The commands are written in sequence separated by |. Different filters are used for Pipes like AWK, GREP.
e.g. sort file | lpr ( sort the file and send it to printer)

Question 5. Explain Trap Command; Shift Command, Getopts Command Of Linux
Answer :
Trap command: controls the action to be taken by the shell when a signal is received.
Trap [OPTIONS] [ [arg] signspec..]
Arg is the action to be taken or executed on receiving a signal specified in signspec.
e.g. trap “rm $FILE; exit” // exit (signal) and remove file (action).
Shift Command: Using shift command, command line arguments can be accessed. The command causes the positional parameters shift to the left. Shift [n] where n defaults to 1. It is useful when several parameters need to be tested.
Getopts command: this command is used to parse arguments passed. It examines the next command line argument and determines whether it is a valid option.
Getopts {optstring} {variable1}. Here, optsring contains letters to be recognized if a letter is followed by a colon, an argument should be specified. E.g (whether the argument begins with a minus sign and is followed by any single letter contained inside options ) If not, diagnostic messages are shown. It is usually executed inside a loop.


Question 6. What Stateless Linux Server? What Feature It Offers?
Answer :
A stateless Linux server is a centralized server in which no state exists on the single workstations. There may be scenarios when a state of a partilcuar system is meaningful (A snap shot is taken then) and the user wants all the other machines to be in that state. This is where the stateless Linux server comes into picture.
Features:
It stores the prototypes of every machine.
It stores snapshots taken for those systems.
It stores home directories for those system.
Uses LDAP containing information of all systems to assist in finding out which snapshot (of state) should be running on which system.

Question 7. What Does Nslookup Do? Explain Its Two Modes.
Answer :
Nslookup is used to find details related to a Domain name server. Details like IP addresses of a machine, MX records, servers etc. It sends a domain name query packet to the corresponding DNS.
Nslookup has two modes. Interactive and non interactive. Interactive mode allows the user to interact by querying information about different hosts and domains.
Non interactive mode is used to fetch information about the specified host or domain.
Interactive mode:
Nslookup [options] [server]

Question 8. What Is Bash Shell?
Answer :
Bash is a free shell for UNIX. It is the default shell for most UNIX systems. It has a combination of the C and Korn shell features. Bash shell is not portable. any Bash-specific feature will not function on a system using the Bourne shell or one of its replacements, unless bash is installed as a secondary shell and the script begins with #!/bin/bash. It supports regular and expressions. When bash script starts, it executes commands of different scripts.

Question 9. What Are The Process States In Linux?
Answer :
Process states in Linux:
Running: Process is either running or ready to run.
Interruptible: a Blocked state of a process and waiting for an event or signal from another process.
Uninterruptible:- a blocked state. Process waits for a hardware condition and cannot handle any signal.
Stopped: Process is stopped or halted and can be restarted by some other process.
Zombie: process terminated, but information is still there in the process table.

Question 10. What Is A Zombie? 
Answer :
Zombie is a process state when the child dies before the parent process. In this case the structural information of the process is still in the process table. Since this process is not alive, it cannot react to signals. Zombie state can finish when the parent dies. All resources of the zombie state process are cleared by the kernel.

Question 11. Explain Each System Calls Used For Process Management In Linux. 
Answer :
System calls used for Process management:
Fork () :- Used to create a new process
Exec() :- Execute a new program
Wait():- wait until the process finishes execution
Exit():- Exit from the process
Getpid():- get the unique process id of the process
Getppid():- get the parent process unique id
Nice():- to bias the existing property of process
Question 12. How Do You List Files In A Directory?
Answer :
ls - list directory contents
ls -l (-l use a long listing format)
Question 13. How Do You List All Files In A Directory, Including The Hidden Files?
Answer :
ls -a (-a, do not hide entries starting with .)
Question 14. How Do You Find Out All Processes That Are Currently Running?
Answer :
ps -f (-f does full-format listing.)
Question 15. How Do You Find Out The Processes That Are Currently Running Or A Particular User?
Answer :
ps -au Myname (-u by effective user ID (supports names)) (a - all users)
Question 16. How Do You Kill A Process?
Answer :
kill -9 8 (process_id 8) or kill -9 %7 (job number 7)
kill -9 -1 (Kill all processes you can kill.)
killall - kill processes by name most (useful - killall java)
Question 17. What Would You Use To Edit Contents Of The File?
Answer :
vi screen editor or jedit, nedit or ex line editor
Question 18. What Would You Use To View Contents Of A Large Error Log File?
Answer :
tail -10 file_name ( last 10 rows)
Question 19. How Do You Log In To A Remote Unix Box?
Answer :
Using telnet server_name or ssh -l ( ssh - OpenSSH SSH client (remote login program))
Question 20. How Do You Get Help On A Unix Terminal?
Answer :
man command_name
info command_name (more information)
Question 21. How Do You List Contents Of A Directory Including All Of Its Subdirectories, Providing Full Details And Sorted By Modification Time?
Answer :
ls -lac
-a all entries
-c by time
Question 22. What Is A Filesystem?
Answer :
Sum of all directories called file system.
A file system is the primary means of file storage in UNIX. File systems are made of inodes and superblocks.
Question 23. How Do You Get Its Usage (a Filesystem)?
Answer :
By storing and manipulate files.
Question 24. How Do You Check For Processes Started By User 'pat'?
Answer :
ps -fu pat (-f -full_format u -user_name )
Question 25. How Do You Start A Job On Background?
Answer :
bg %4 (job 4)
Question 26. What Utility Would You Use To Replace A String '2001' For '2002' In A Text File?
Answer :
Grep, Kde( works on Linux and Unix)
Question 27. What Utility Would You Use To Cut Off The First Column In A Text File?
Answer :
awk, kde
Question 28. How To Copy File Into Directory?
Answer :
cp /tmp/file_name . (dot mean in the current directory)
Question 29. How To Remove Directory With Files?
Answer :
rm -rf directory_name
Question 30. What Is The Difference Between Internal And External Commands?
Answer :
Internal commands are stored in the; same level as the operating system while external commands are stored on the hard disk among the other utility programs.
Question 31. List The Three Main Parts Of An Operating System Command:
Answer :
The three main parts are the command, options and arguments.
Question 32. What Is The Difference Between An Argument And An Option (or Switch)?
Answer :
An argument is what the command should act on: it could be a filename, directory or name. An option is specified when you want to request additional information over and above the basic information each command supplies.
Question 33. What Is The Purpose Of Online Help?
Answer :
Online help provides information on each operating system command, the syntax, the options, the arguments with descriptive information.
Question 34. Name Two Forms Of Security.
Answer :
Two forms of security are Passwords and File Security with permissions specified.
Question 35. What Command Do You Type To Find Help About The Command Who?
Answer :
$ man who
Question 36. What Is The Difference Between Home Directory And Working Directory?
Answer :
Home directory is the directory you begin at when you log into the system. Working directory can be anywhere on the system and it is where you are currently working.
Question 37. Which Directory Is Closer To The Top Of The File System Tree, Parent Directory Or Current Directory?
Answer :
The parent directory is above the current directory, so it is closer to the root or top of the file system.
Question 38. What Are Two Subtle Differences In Using The More And The Pg Commands?
Answer :
With the more command you display another screenful by pressing the spacebar, with pg you press the return key.
The more command returns you automatically to the UNIX shell when completed, while pg waits until you press return.
Question 39. When Is It Better To Use The More Command Rather Than Cat Command?
Answer :
It is sometimes better to use the more command when you are viewing a file that will display over one screen.
Question 40. What Are Two Functions The Move Mv Command Can Carry Out?
Answer :
The mv command moves files and can also be used to rename a file or directory.
Question 41. Name Two Methods You Could Use To Rename A File?
Answer :
Two methods that could be used:
a. use the mv command
b. copy the file and give it a new name and then remove the original file if no longer needed.
Question 42. List All The Files Beginning With A?
Answer :
To list all the files beginning with A command: ls A*
Question 43. Which Of The Quoting Or Escape Characters Allows The Dollar Sign ($) To Retain Its Special Meaning?
Answer :
The double quote (") allows the dollar sign ($) to retain its special meaning. Both the backslash (\) and single quote (') would remove the special meaning of the dollar sign.
Question 44. What Is A Faster Way To Do The Same Command? Mv Fileo.txt Newdir Mv Filel.txt Newdir Mv File2.txt Newdir Mv File3.txt Newdir?
Answer :
A shortcut method would be: mv file?.txt newdir
Question 45. List Two Ways To Create A New File:
Answer :
a.Copy a file to make a new file.
b. Use the output operator e.g. ls -l > newfile.txt
Question 46. What Is The Difference Between > And >> Operators?
Answer :
The operator > either overwrites the existing file (WITHOUT WARNING) or creates a new file.
The operator >> either adds the new contents to the end of an existing file or creates a new file.
Question 47. How Can You See All Mounted Drives?
Answer :
mount -l
Question 48. How Can You Find A Path To The File In The System?
Answer :
locate file_name (locate - list files in databases that match a pattern)
Question 49. What Linux Hotkeys Do You Know?
Answer :
Ctrl-Alt-F1 Exit to command prompt
Ctrl-Alt-F7 or F8 Takes you back to KDE desktop from command prompt
Crtl-Alt-Backspace Restart XWindows
Ctrl-Alt-D Show desktop
Question 50. What Can You Tell About The Tar Command?
Answer :
The tar program is an immensely useful archiving utility. It can combine an entire directory tree into one large file suitable for transferring or compression.
Question 51. What Types Of Files You Know?
Answer :
Files come in eight flavors:
Normal files
Directories
Hard links
Symbolic links
Sockets
Named pipes
Character devices
Block devices
Question 52. How You Will Uncompress The File?
Answer :
Use tar command (The GNU version of the tar archiving utility):
tar -zxvf file_name.tar.gz
Question 53. What Does Grep() Stand For?
Answer :
General Regular Expression Parser.
Question 54. What Does The Top Command Display?
Answer :
Top provides an ongoing look at processor activity in real time.It displays a listing of the most CPU-intensive tasks on the system, and can provide an interactive inter¬ face for manipulating processes. (q is to quit)
Question 55. How To Find Difference In Two Configuration Files On The Same Server?
Answer :
Use diff command that is compare files line by line
diff -u /usr/home/my_project1/etc/ABC.conf /usr/home/my_project2/etc/ABC.conf
Question 56. What Is The Best Way To See The End Of A Logfile.log File?
Answer :
Use tail command - output the last part of files
tail -n file_name ( the last N lines, instead of the last 10 as default)
Question 57. Please Write A Loop For Removing All Files In The Current Directory That Contains A Word 'log'?
Answer :
for i in *log*; do rm $i; done
Question 58. How To Switch To A Previously Used Directory?
Answer :
cd -
Question 59. How Many Vi Editor Modes Do You Know?
Answer :
Three modes -
Command mode: letters or sequence of letters interactively command vi.
Insert mode: Text is inserted.
Command line mode: enter this mode by typing ":" and entry command line at the foot of the screen.
Question 60. How Can You Terminate Vi Session?
Answer :
Use command: ZZ that is save changes and quit.
Use command line: ":wq" that is write changes and quit.
Use command line: ":q!" to ignore changes and quit.
Question 61. How Can You Copy Lines Into The Buffer In Command Mode?
Answer :
yy - copy a single line defined by current cursor position
3yy - copy 3 lines. Current line and two lines below it.
Question 62. We Saw The Mention On The Linux Bios Website About One Million Devices Shipped With Linux Bios. Could You Tell Us More About These Devices? 
Answer :
Yes, these are internet terminals that were built in India, based on the [x86 system-on-chip] STPC chip, I am told; also, there evidently is a Turkish-built digital TV that runs Linux BIOS. I have also heard that there are routers and many other embedded devices running Linux BIOS. I think at this point that 1 million is a low number. I am in contact with other set-top box vendors that are talking about numbers in the lOs of millions for their products. These numbers actually make the OLPC numbers seem small, which is in it amazing.
Question 63. What's Your Goal For Your Talk At Fosdem? 
Answer :
I’d like to communicate the basic ideas — that Linux is a good BIOS, and why; why Linux BIOS is built the way it is; where we are going; and how people can help. Most importantly, why it all matters — and it really matters a lot. We’re on the verge of losing control of the systems we buy, and we need to make a conscious effort, as a community, to ensure this loss of control does not happen. That effort will not be without some sacrifice, but if we are to maintain our ability to use and program our machines, and have fun with them, we have to act now. Because, if the computing business stops being fun, what’s the point$
Question 64. What Are Mysql Transactions? 
Answer :
A set of instructions/queries that should be executed or rolled back as a single atomic unit.
Question 65. Explain Multi-version Concurrency Control In Mysql?
Answer :
Each row has two additional columns associated with it - creation time and deletion time, but instead of storing timestamps, MySQL stores version numbers.
Question 66. Explain Mysql Locks. 
Answer :
Table-level locks allow the user to lock the entire table, page-level locks allow locking of certain portions of the tables (those portions are referred to as tables), row-level locks are the most granular and allow locking of specific rows.
Question 67. Explain Mysql Architecture. 
Answer :
The front layer takes care of network connections and security authentications, the middle layer does the SQL query parsing, and then the query is handled off to the storage engine. A storage engine could be either a default one supplied with MySQL (MyISAM) or a commercial one supplied by a third-party vendor (ScaleDB, InnoDB, etc.)
Question 68. List The Main Applications Of 8 Bit Microprocessors? 
Answer :
8 bit microprocessors are used in a variety of applications such as appliances automobiles ,industrial process and control applications.
Question 69. What Is Nv-ram? 
Answer :
Nonvolatile Read Write Memory, also called Flash memory. It is also know as shadow RAM.
Question 70. Can Rom Be Used As Stack? 
Answer :
ROM cannot be used as stack because it is not possible to write to ROM.
Question 71. What Is Stack? 
Answer :
Stack is a portion of RAM used for saving the content of Program Counter and general purpose registers.
Question 72. What Is Flag? 
Answer :
Flag is a flip-flop used to store the information about the status of a processor and the status of the instruction executed most recently .
Question 73. Which Processor Structure Is Pipelined? 
Answer :
All x86 processors have pipelined structure.
Question 74. What Is A Compiler? 
Answer :
Compiler is used to translate the high-level language program into machine code at a time. It doesn’t require special instruction to store in a memory, it stores automatically. The Execution time is less compared to Interpreter.
Question 75. Differentiate Between Ram And Rom? 
Answer :
RAM: Read / Write memory, High Speed, Volatile Memory. ROM: Read only memory, Low Speed, Non Voliate Memory.
Question 76. Which Transistor Is Used In Each Cell Of Eprom? 
Answer :
Floating .gate Avalanche Injection MOS (FAMOS) transistor is used in each cell of EPROM.
Question 77. What Is Called .scratch Pad Of Computer.? 
Answer :
Cache Memory is scratch pad of computer.
Question 78. What Is Cache Memory? 
Answer :
Cache memory is a small high-speed memory. It is used for temporary storage of data & information between the main memory and the CPU (center processing unit). The cache memory is only in RAM.
Question 79. What Is Interrupt? 
Answer :
Interrupt is a signal send by external device to the processor so as to request the processor to perform a particular work.
Question 80. Difference Between Static And Dynamic Ram? 
Answer :
Static RAM: No refreshing, 6 to 8 MOS transistors are required to form one memory cell, Information stored as voltage level in a flip flop.
Dynamic RAM: Refreshed periodically, 3 to 4 transistors are required to form one memory cell, Information is stored as a charge in the gate to substrate capacitance.
Question 81. What Is The Difference Between Primary & Secondary Storage Device? 
Answer :
In primary storage device the storage capacity is limited. It has a volatile memory. In secondary storage device the storage capacity is larger. It is a nonvolatile memory. Primary devices are: RAM / ROM. Secondary devices are: Floppy disc I Hard disk.
Question 82. Why Does Microprocessor Contain Rom Chips? 
Answer :
Microprocessor contain ROM chip because it contain instructions to execute data.
Question 83. What Is Meant By Latch? 
Answer :
Latch is a D- type flip-flop used as a temporary storage device controlled by a timing signal, which can store 0 or 1. The primary function of a Latch is data storage. It is used in output devices such as LED, to hold the data for display.
Question 84. What Is The Difference Between Microprocessor And Microcontroller? 
Answer :
In Microprocessor more op-codes, few bit handling instructions. But in Microcontroller: fewer op-codes, more bit handling Instructions, and also it is defined as a device that includes micro processor, memory, & input / output signal lines on a single chip.
Question 85. What Is The Disadvantage Of Microprocessor? 
Answer :
It has limitations on the size of data. Most Microprocessor does not support floating-point operations.
Question 86. Is The Data Bus Is Bi-directional? 
Answer :
The data bus is Bi-directional because the same bus is used for transfer of data between Micro Processor and memory or input / output devices in both the direction.
Question 87. Is The Address Bus Unidirectional? 
Answer :
The address bus is unidirectional because the address information is always given by the Micro Processor to address a memory location of an input I output devices.
Question 88. Define Hcmos? 
Answer :
High-density n- type Complimentary Metal Oxide Silicon field effect transistor.
Question 89. What Is 1st / 2nd / 3rd / 4th Generation Processor? 
Answer :
The processor made of PMOS I NMOS / HMOS I HCMOS technology is called 1st / 2nd / 3rd / 4th generation processor, and it is made up of 4 / 8 / 16 / 32 bits.
Question 90. Why 8085 Processor Is Called An 8 Bit Processor? 
Answer :
Because 8085 processor has 8 bit ALU (Arithmetic Logic Review). Similarly 8086 processor has 16 bit ALU.
Question 91. Give Examples For 8 I 16 / 32 Bit Microprocessor? 
Answer :
8-bit Processor - 8085 I Z80 / 6800; 16-bit Processor - 8086 / 68000 / Z8000; 32-bit Processor - 80386 I 80486.
Question 92. What Is A Microprocessor? 
Answer :
Microprocessor is a program-controlled device, which fetches the instructions from memory, decodes and executes the instructions. Most Micro Processor is single- chip devices.
Question 93. What Command Would You Use To Create An Empty File Without Opening It To Edit It? 
Answer :
You use the touch command to create an empty file without needing to open it. Answers a and e point to invalid commands, though either of these might actually be aliased to point to a real command. Answers b and c utilize editors, and so do not satisfy the requirements of the question. actually touch is used to change the timestamps of a file if its exits, otherwise a new file with current timestamps will be created.
Question 94. What Do You Type To Stop A Hung Process That Resists The Standard Attempts To Shut It Down? 
Answer :
The kill command by itself tries to allow a process to exit cleanly. You type kill -9 PID, on the other hand, to abruptly stop a process that will not quit by any other means. Also, pressing CtrI+C works for many programs. Answers b and d are only valid in some contexts, and even in those contexts will not work on a hung process.
Question 95. Which Two Commands Can You Use To Delete Directories? 
Answer :
You can use rmdir or rm -rf to delete a directory. Answer a is incorrect, because the rm command without any specific flags will not delete a directory, it will only delete files. Answers d and e point to a non-existent command.
Question 96. What Is Difference Between At And Cron? 
Answer :
Cron command is used to schedule the task daily at the same time repeatedly ,“at” command is used to schedule the task only once i.e. to run only one time.
Question 97. Which Of The Following Tasks Cannot Be Accomplished With The Touch Command? 
Answer :
The touch command is usually used to modify either a file’s access or modification time. It can also be used to create a new file.
Question 98. You Want To Copy The User's Home Directories To A New Location. Which Of The Following Commands Will Accomplish This? 
Answer :
The -r option tells the cp command to recurs the directories. The -P option retains the original permissions.
Question 99. You Read An Article That Lists The Following Command: Dd If=/dev/fdo Bs=512 Of=/new What Does This Accomplish? 
Answer :
The dd command is a special copy command often used for floppy disks and tapes. The if= option specifies the source; the bs= is the block size; and the of= option is the output.
Question 100. You Attempt To Delete A File Called Sales.mem Using The Rm Command But The Command Fails. What Could Be The Problem? 
Answer :
In order to delete a file, you must have write rights to the directory containing the file.
Question 101. You Want To Search For Sale And Sales. What Regular Expression Should You Use? 
Answer :
Use the asterick (*) to match to zero or more characters. The ‘$‘ matches to any one character so sale$ would not find sale.
Question 102. You Want To Know How Many Lines In The Kickoff File Contains 'prize'. Which Of The Following Commands Will Produce The Desired Results? 
Answer :
Using the -c option with the grep command will show the total number of lines containing the specified pattern rather than displaying the lines containing the pattern.
Question 103. You Want To Verify Which Lines In The File Kickoff Contain 'bob'. Which Of The Following Commands Will Accomplish This? 
Answer :
The -n option when used with sed prints only the lines containing the pattern. In this case, the pattern is ‘Bob’ and the file to be searched is kickoff.
Question 104. You Have A File Called Docs.z But Do Not Know What It Is. What Is The Easiest Way To Look At The Contents Of The File? 
Answer :
The .Z extension indicates that this is a file that has been compressed using the compress utility. The zcat utility provides the ability to display the contents of a compressed file.
Question 105. After Copying A File To A Floppy Disk, What Should You Do Before Removing The Disk? 
Answer :
If you do not unmount the floppy before removing it, the files on the floppy may become corrupted.
Question 106. You Have Set Quotas For All Your Users But Half Of Your Users Are Using More Space Than They Have Been Allotted. Which Of The Following Could Be The Problem? 
Answer :
Quotas are set on a partition by partition basis. If your users have home directories on different partitions, you will need to configure quotas for each partition.
Question 107. What Command Should You Use To Check The Number Of Files And Disk Space Used And Each User's Defined Quotas? 
Answer :
The repquota command is used to get a report on the status of the quotas you have set including the amount of allocated space and amount of used space.
Question 108. You Have A Large Spreadsheet Located In The /data Directory That Five Different People Need To Be Able To Change. How Can You Enable Each User To Edit The Spreadsheet From Their Individual Home Directories? 
Answer :
By creating a link to the file in each user’s home directory, each user is able to easily open and edit the spreadsheet. Also, any changes that are made are seen by all the users with access.
Question 109. You Have A File Called Sales Data And Create Symbolic Links To It In Bob's Home Directory. Bob Calls You And Says That His Link No Longer Works. How Can You Fix The Link? 
Answer :
Because the link in bob’s directory is a symbolic link, if the file sales data in the /data directory is deleted, the symbolic link will no longer work.
Question 110. What Is Meant By Sticky Bit? 
Answer :
When the sticky bit is set on a world writable directory, only the owner can delete any file contained in that directory.
Question 111. Your Default Umask Is 002. What Does This Mean? 
Answer :
The digits of your umask represent owner, group and others in that order.
The 0 gives read and write for files and the 2 gives read only for files.
Question 112. Which Of The Following Commands Will Replace All Occurrences Of The Word Rate With The Word Speed In The File Racing? 
Answer :
When using sed to do a search and replace, its default action is to only replace the first occurrence in each line. Adding the ‘g’ makes sed replace all occurrences of the search term even when it occurs multiple times on the same line.
Question 113. You Have A Tab Delimited File Called Phonenos And Want To Change Each Tab To Four Spaces. What Command Can You Use To Accomplish This? 
Answer :
By default, expand converts tabs to eight spaces. Use the -t option to change this behavior.
Question 114. You Issue The Command Head * What Would The Resulting Output Be?
Answer :
If the number of lines to display is not specified, the first ten lines of the specified file are displayed. The asterick tells head to display the content of each file in the present working directory.
Question 115. What Text Filter Can You Use To Display A Binary File In Octal Numbers? 
Answer :
The od text filter will dumpt the contents of a file and display it in 2-byte octal numbers.
Question 116. What Would Be The Result Of The Command Paste -s Dog Cat? 
Answer :
The paste text filter usually joins two files separating the corresponding lines with a tab. The -s option, however, will cause paste to display the first file, dog, then a new line character, and then the file cat.
Question 117. You Wish To Print The File Vacations With 60 Lines To A Page. Which Of The Following Commands Will Accomplish This? 
Answer :
The default page length when using pr is 66 lines. The -l option is used to specify a different length.
Question 118. What Would Be The Result Of Issuing The Command Cat Phonenos? 
Answer :
The tac text filter is a reverse cat. It displays a file starting with the last line and ending with the first line.
Question 119. You Need To See The Last Fifteen Lines Of The Files Dog, Cat And Horse. What Command Should You Use? 
Answer :
The tail utility displays the end of a file. The -15 tells tail to display the last fifteen lines of each specified file.
Question 120. What Is The Real Mean Of Dhcp? 
Answer :
Dynamic addressing simplifies network administration because the s/w keeps track of IP addresses rather than requiring an administrator to manage the task. That means new computer can be added to the network without any risk of manually assigning unique IP address.
Question 121. What Is Nfs? What Is Its Job? 
Answer :
NFS stands for Network File System. NFS enables filesystems physically residing on one computer system to be used by other computers in the network, appearing to users on the remote host as just another local disk.
Question 122. In Linux Os, What Is The File Server? 
Answer :
The file server is a machine that shares its disk storage and files with other machines on the network.
Question 123. What Are The Techniques That You Use To Handle The Collisions In Hash Tables? 
Answer :
We can use two major techniques to handle the collisions. They are open addressing and separate chaining. In open addressing, data items that hash to a full array cell are placed in another cell in the array. In separate chaining, each array element consists of a linked list. All data items hashing to a given array index are inserted in that list.
Question 124. What Is The Major Advantage Of A Hash Table? 
Answer :
The major advantage of a hash table is its speed. Because the hash function is to take a range of key values and transform them into index values in such a way that the key values are distributed randomly across all the indices of a hash table.
Question 125. What Is Write Command? 
Answer :
The write command enables you to write an actual message on the other terminal online. You have to issue the write command with the login ID of the user with whom you want to communicate. The write command informs the user at the other end that there is a message from another user. write pastes that message onto the other user’s terminal if their terminal’s write permissions are set. Even if they are in the middle of an edit session, write overwrites whatever is on the screen. The edit session contents are not corrupted; you can restore the original screen on most editors with Ctrl-L. write is mostly used for one-way communication, but you can have an actual conversation as well.
Question 126. Why You Shouldn't Use The Root Login? 
Answer :
The root login does not restrict you in any way. When you log in as root, you become the system. The root login is also sometimes called the super user login. With one simple command, issued either on purpose or by accident, you can destroy your entire Linux installation. For this reason, use the root login only when necessary. Avoid experimenting with commands when you do log in as root.
Question 127. How Big Should The Swap-space Partition Be? 
Answer :
Swap space is used as an extension of physical RAM, the more RAM you have, the less swap space is required. You can add the amount of swap space and the amount of RAM together to get the amount of RAM Linux will use. For example, if you have 8MB of RAM on your machine’s motherboard, and a 16MB swap-space partition, Linux will behave as though you had 24MB of total RAM.
Question 128. Which Field Is Used To Define The User's Default Shell? 
Answer :
command-The last field, called either command or login command, is used to specify what shell the user will use when he logs in.
Question 129. When You Create A New Partition, You Need To Designate Its Size By Defining The Starting And Ending? 
Answer :
cylinders-When creating a new partition you must first specify its starting cylinder. You can then either specify its size or the ending cylinder.
Question 130. What Can You Type At A Command Line To Determine Which Shell You Are Using? 
Answer :
echo $SHELL-The name and path to the shell you are using is saved to the SHELL environment variable. You can then use the echo command to print out the value of any variable by preceding the variable’s name with $. Therefore, typing echo $SHELL will display the name of your shell.
Question 131. In Order To Display The Last Five Commands You Have Entered Using The Fc Command, You Would Type? 
Answer :
fc -5-The fc command can be used to edit or rerun commands you have previously entered. To specify the number of commands to list, use -n.
Question 132. What Command Should You Use To Check Your File System? 
Answer :
fsck-The fsck command is used to check the integrity of the file system on your disk.
Question 133. What File Defines The Levels Of Messages Written To System Log Files? 
Answer :
kernel.h-To determine the various levels of messages that are defined on your system, examine the kernel.h file.
Question 134. What Account Is Created When You Install Linux? 
Answer :
root-Whenever you install Linux, only one user account is created. This is the super user account also known as root.
Question 135. What Daemon Is Responsible For Tracking Events On Your System? 
Answer :
Syslogd-The syslogd daemon is responsible for tracking system information and saving it to specified log flies.
Question 136. Where Standard Output Is Usually Directed? 
Answer :
To the screen or display-By default, your shell directs standard output to your screen or display.
Question 137. What Utility Can You Use To Show A Dynamic Listing Of Running Processes? 
Answer :
Top-The top utility shows a listing of all running processes that is dynamically updated.
Question 138. Who Owns The Data Dictionary? 
Answer :
The SYS user owns the data dictionary. The SYS and SYSTEM users are created when the database is created.
Question 139. What Command Can You Use To Review Boot Messages?
Answer :
dmesg
The dmesg command displays the system messages contained in the kernel ring buffer.
By using this command immediately after booting your computer, you will see the boot messages.
Question 140. What Is The Minimum Number Of Partitions You Need To Install Linux?
Answer :
2
Linux can be installed on two partitions, one as / which will contain all files and a swap partition.

Most Important's Surveying Interview Questions in 2018....

Surveying Interview Questions & Answers







Question 1. What Is Surveying?

Answer :
The profession or work of examining and recording the area and features of a piece of land so as to construct a map, plan, or detailed description of it.

Question 2. What Is A Surveyor?

Answer :
Surveyors update boundary lines and prepare sites for construction so that legal disputes are prevented. Surveyors make precise measurements to determine property boundaries. They provide data relevant to the shape and contour of the Earth's surface for engineering, mapmaking, and construction projects.

Question 3. What Is A Property Surveyor?

Answer :
It is important, therefore, that you employ a surveyor yourself to undertake a thorough inspection of the property you wish to buy. The types of surveys available. There are two main types of structural survey available for those buying a property: a Homebuyer's Report or a Full Building Survey.

Question 4. What Is A Marine Surveyor?

Answer :
A Marine surveyor (including "Yacht & Small Craft Surveyor", "Hull & Machinery Surveyor" and/or "Cargo Surveyor") is a person who conducts inspections, surveys or examinations of marine vessels to assess, monitor and report on their condition and the products on them, as well as inspects damage caused to both vessels .

Question 5. What Is An Automatic Level?

Answer :
A dumpy level, builder's auto level, leveling instrument, or automatic level is an optical instrument used to establish or verify points in the same horizontal plane. It is used in surveying and building with a vertical staff to measure height differences and to transfer, measure and set heights.


Question 6. What Is The Use Of Dumpy Level?

Answer :
A dumpy level is a surveying tool that measures horizontal lines. It is used to determine relative height and distance among different locations. In modern times, it is most commonly used to obtain measurements for buildings rather than to gather information on large tracts of land.

Question 7. What Does It Mean To Survey A Boat?

Answer :
Basically, it is a detailed inspection of a boat, hopefully done by a qualified, diligent, intelligent and honest surveyor, for the purpose of determining its current condition and seaworthiness.

Question 8. What Is A Chartered Quantity Surveyor?

Answer :
Members and Fellows of the RICS entitled to use the designation (and a number of variations such as "Chartered Building Surveyor" or "Chartered Quantity Surveyor" or "Chartered Civil Engineering Surveyor" depending on their field .

Question 9. What Is A Level Staff?

Answer :
A level staff, also called levelling rod, is a graduated wooden or aluminum rod, used with a levelling instrument to determine the difference in height between points or heights of points above a datum surface.



Question 10. What Is A Transit Tool?

Answer :
A transit level is an optical instrument, or a telescope, complete with a built-in spirit level that is mounted on a tripod. Transit levels are used mainly for surveying and building, but they can be used to determine the relative position of lines and objects as well.

Question 11. What Is An Abney Level Used For?

Answer :
An Abney level and clinometer, is an instrument used in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale.

Question 12. What Is A Total Station?

Answer :
A Total Station is a modern surveying instrument that integrates an electronic theodolite with an electronic distance meter. A theodolite uses a movable telescope to measure angles in both the horizontal and vertical planes.

Question 13. What Is Meant By Hydrographic Survey?

Answer :
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/offshore oil drilling and related activities.

Question 14. How Long Does It Take To Become A Chartered Surveyor?

Answer :
Most states require a degree along with an internship, to become a professional land surveyor. Most degrees are a four year college degree in surveying or geomatics or a 2 year associate degree. After college you then have to become licensed in whichever state you want to practice surveying in.

Question 15. How Does A Theodolite Work?

Answer :
A theodolite works by combining optical plummets (or plumb bobs), a spirit (bubble level), and graduated circles to find vertical and horizontal angles in surveying. An optical plummet ensures the theodolite is placed as close to exactly vertical above the survey point.

Question 16. What Is A Surveyor's Transit?

Answer :
A vernier compass has an adjustable scale that allows for the "setting off" of the magnetic declination and the compass can then directly read true north. The Transit and Theodolite. Transit. Theodolite. The transit and theodolite are used by the surveyor to measure both horizontal and vertical angles.

Question 17. What Is An Optical Square?

Answer :
An optical square is a square refracting block which refracts an incident beam at an angle of 90 degrees.It can be used with an autocollimator for measuring squareness of a workpiece.

Question 18. What Is An Edm In Surveying?

Answer :
A total station or TST (total station theodolite) is an electronic/optical instrument used in modern surveying and building construction. The total station is an electronic theodolite (transit) integrated with an electronic distance meter (EDM) to read slope distances from the instrument to a particular point.

Question 19. What Is A Digital Theodolite Used For?

Answer :
In addition to measuring horizontal and vertical angles, digital theodolite are used to establish straight lines, to establish horizontal and vertical distances through the use of stadia, and to establish elevations when used as a level.

Question 20. What Is A Bathymetric Survey?

Answer :
Bathymetry is the study of the "beds" or "floors" of water bodies, including the ocean, rivers, streams, and lakes. The term "bathymetry" originally referred to the ocean's depth relative to sea level, although it has come to mean “submarine topography,” or the depths and shapes of underwater terrain.

Question 21. What Is An Intermediate Survey?

Answer :
Intermediate Survey—The inspection of a vessel by a classification society surveyor which takes place between two and three years before and after each Special Survey for such vessel pursuant to the rules of international conventions and classification societies.

Question 22. What Is The Rics?

Answer :
The Royal Institution of Chartered Surveyors (RICS) is a professional body that accredits professionals within the land, property and construction sectors worldwide. Members holding RICS qualifications may use the following designations after their name: MRICS (Member), FRICS (Fellow), AssocRICS (Associate).

Question 23. What Is The Apc?

Answer :
The APC – assessment of professional competence – is the training scheme that graduates need to complete on the job to qualify as a chartered surveyor. Becoming chartered with the Royal Institution of Chartered Surveyors (RICS) is a key milestone in a surveyor's professional development.

Question 24. What Is A Graphometer?

Answer :
The graphometer, semicircle or semicircumferentor is a surveying instrument used for angle measurements. It consists of a semicircular limb divided into 180 degrees and sometimes subdivided into minutes. The limb is subtended by the diameter with two sights at its ends.

Question 25. What Is The Basic Principle Of Chain Surveying?

Answer :
Chain surveying is the type of surveying in which only linear measurements are made in the field. The main principle of chain surveying or chain triangulation is to provide a framework consist of number of well-conditioned triangles or nearly equilateral triangles. It is used to find the area of the field.

Question 26. What Is The Chain Survey?

Answer :
Chain survey is the simplest method of surveying. In this survey only measurements are taken in the field, and the rest work, such as plotting calculation etc. are done in the office. This is most suitable adapted to small plane areas with very few details.

Question 27. What Is The Tool Surveyors Use?

Answer :
The main surveying instruments in use around the world are the theodolite, measuring tape, total station, 3D scanners, GPS/GNSS, level and rod. Most instruments screw onto a tripod when in use. Tape measures are often used for measurement of smaller distances.

Question 28. What Is A Chartered Surveyor?

Answer :
Chartered surveyors in the core of the profession may offer mortgage valuations, homebuyer's survey and valuations, full building surveys, building surveyors' services, quantity surveying, land surveying, auctioneering, estate management and other forms of survey- and building-related advice.

Question 29. What Is The Purpose Of Hydrographic Surveying?

Answer :
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/offshore oil drilling and related activities.



Question 30. What Is A Tacheometer?

Answer :
Tacheometry, from the Greek "quick measure", is a system of rapid surveying, by which the positions, both horizontal and vertical, of points on the earth's surface relatively to one another are determined without using a chain or tape or a separate leveling instrument.
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