Dear Readers, Welcome to CHAIN SURVEYING Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of CHAIN SURVEYING. These CHAIN SURVEYING Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.
In surveying the measurements are taken in horizontal plane, but in leveling they are taken in the vertical plane.
In Plane surveying, the curvature of the earth is not considered. But in Geodetic surveying, the curvature of the earth is considered.
A map which shows the natural features of a country such as rivers, hills, roads, railways, villages, towns, etc. is known as topographical map, and one which shows the boundaries of estates, fields, houses, etc. is known as a cadastral map.
The fundamental principle of surveying is to work from the whole to the part.
In order to fold the chain, a chainman moves forward by pulling the chain at the middle so that two halves come side by side. Then he places the pair of links on his left hand with his right hand until the two brass handles appear at the top.
To unfold the chain: A chain man holds the two brass handles in his left hand and throws the bunch with his right hand. Then one chain man stands at a station holding one handle and another chainman moves forward by holding the other handle.
The chain man at the forward end of the chain who drags the chain is known as the leader and the one at the rear end of the chain is known as the follower.
The stepping method.
The ranging is to be done by the reciprocal method.
The tension at which the measured distance is equal to the correct distance (i.e; when sag correction is neutralized by pull correction) is known as normal tension.
The ratio of the distance on the drawing to the corresponding actual length of the object is known as RF.
The plain scale represents two successive units. The diagonal scale represents three successive units.
When one chain length is measured on slopping ground then it shows a shorter distance on the horizontal distance is known as the hypotenusal allowance.
At least three ranging rods required for direct ranging and at least four for indirect ranging.
The 20m chain is divided in to 100 links. So, one link is 0.2m. i.e; 20cm. long.
The Principle of chain surveying is triangulation.
The method of dividing an area into a number of triangles is known as triangulation.
The triangle is preferred just it is a simple figure which can be drawn by just knowing the lengths of its sides.
The apex point of an ill conditioned triangle is not well defined and sharp. This may cause some confusion while marking the actual point correctly on the map.
The preliminary inspection of the area to be surveyed is known as reconnaissance survey.
During reconnaissance survey a neat hand sketch is prepared showing the frame work of the survey. This sketch is known as index sketch.
Department of Civil Engineering
Base line is the back bone of the survey. The frame work of the survey is prepared on this line.
The north line of the chain survey map is fixed by taking the magnetic bearings of the base line by prismatic compass.
In chain survey, whole area is to be divided into a number of triangles. But the formation of triangles is not possible in a crowded area. So I would reject the proposal.
The maximum length of the offset should be within the length of the tape used. Generally it should not be more than 15m.
The station is marked on the ground by a wooden peg and with a cross on the station point.
If the station peg is removed by some one the station can be located accurately with the help of measurements shown in reference sketch.
By forming triangle in the ratio 3:4:5 using the chain and tape.
The chain man at the forward end of the chain who drags the chain is known as the leader. The one at the rear end of the chain is known as the follower.
If the field book is opened lengthwise, it becomes easy to maintain the continuation of a chain line.
The paper on which the map is drawn may shrink or expand due to various reasons. If the scale is plotted on the map, then it is also reduced or enlarged proportionately. So the distance on the map measured by this scale remains unaltered.
Tallies are provided in a chain for the facility to counting some fractional length of the chain, when the full chain length is not required.
An equilateral triangle is said to be ideal.
If you have studied the Surveying or if you are still studying, then this is the one of the first question which you should know. When ever you have to do any kind of survey you have to do it from whole to parts.
It is the first principle of Surveying. Initially main control points are established with very high accuracy at the far distances to cover whole the area and then using these points as the reference points you establish the secondary and tertiary control points.
Second principle of Surveying which you should know is that any point can be established or located precisely with reference to a minimum of two another reference points. That means you need at least two reference points to locate one another point.
You must know that if you have to do the survey only with the help of chaining then it is done by triangulation. You have to divide the area into a numbers of triangles and measure its sides with the chain or tape.
I think you will be rarely asked this question but putting a variety of ammunition always helps. Generally the height of a ranging rod is 2.4m but it may be varied up to 6m and its diameter is generally 1 inch. There are strips in red and white or red and yellow in the longitudinal direction which are generally 1ft length(30.5cm).
You know that level can be used for the levelling or sometimes for contouring too. So the basic purpose of a level is to provide a horizontal line of sight.
You have to measure the horizontal and vertical angles using the Theodolite, so you must know that least count is 10" to 20" (seconds) for a vernier theodolite but for a micro-meter theodolite least count may be as small as 0.l" .
First of all you must know that this term is related to the compass survey. Sometimes when you are doing the compass survey at places where there are materials which attract a magnetic needle of the compass, the magnetic needle fails to show the magnetic North accurately due to the attraction forces of these materials and therefore it will be deflected from true magnetic meridian.
It is important for you to know such materials which, may cause this error, right? This material can be a chain, a wrist band, a ring in your finger, belt tide to your trouser, a hair band, a nearby electric pole or anything which attracts a magnet, so it might be needed for you know about magnets too.
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