# Describe the method of setting out simple curve by using the method of offset from long chord with sketch.

Describe the method of setting out simple curve by using the method of offset from long chord with sketch.

Given data: Direction of two straights, chainage of point of intersection, radius of curve.

Procedure:

1) Set theodolite over B and measure deflection angle Ф

2) Calculate tangent length by formula R x tan (ϕ/2).

3) Locate first tangent T1 point by measuring backward along BA distance equal to tangent length and second tangent point T2 by measuring forward along BC distance equal to tangent length.

4) Divide long chord into even number of equal parts.

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Description : State the meaning of degree of curve and long chord.

Last Answer : Degree of curve : The angle subtended at the centre by a standard chord of 30 m length, is known as degree of curve. Long Chord : The straight line joining rear tangent point and forward tangent point is called as long chord of curve.

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Last Answer : Sketch of simple circular curve and show notation there on :

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Description : For setting out a simple curve, using two theodolites.  (A) Offsets from tangents are required  (B) Offsets from chord produced are required  (C) Offsets from long chord are required  (D) None of these

Last Answer : (D) None of these

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Description : If the radius of a simple curve is R, the length of the chord for calculating offsets by the method of  chords produced, should not exceed.  (A) R/10  (B) R/15  (C) R/20  (D) R/25

Last Answer : (C) R/20

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Last Answer : Procedure for setting offset with open cross staff : 1. Keep the ranging rods at point P(fixed on survey line) and at point A1 approximately. 2. The cross staff with stadia rod is fixed ... can be fixed and perpendicular offset AB is said to be set to given survey line PQ in left side.

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Last Answer : The errors eliminated by repetition method are : 1) Errors due to eccentricity of verniers and centers are eliminated by taking the both vernier readings and averaging them. 2) Errors due to ... bisection of object may compensate each other. 5) Errors due to improper levelling can be minimized

Description : State the procedure of measurement of horizontal angle by repetition method.

Last Answer : The horizontal angle is measured very precisely using method of repetition as follows : 1) Set-up the theodolite over station O and level it properly. 2) Set the vernier A and vernier B at 0°0'0 ... repeat the same procedure. 9) The mean of both angles gives the horizontal angle AOB.

Description : State the procedure for measuring a horizontal angle by method of repetition.

Last Answer : Procedure : 1. Set up the instrument over Q and level it accurately with the telescope in the normal position. 2. Set the vernier A to 360o. Loosen the lower clamp direct the telescope ... final reading by three. 14. By taking average of both the face, horizontal angle PQR is obtained.

Description : State Direct & indirect method of contouring.Explain tacheometric method.

Last Answer : Method of contouring are: 1.Direct method 2 Indirect methods which include a)by cross section b)by squares c) tachometric contouring method. Tachometric contouring method. 1.This method ... calculated by tacheometry formulae. 4 The survey is plotted and then contour lines are interpolated.

Description : Describe the use of digital theodolite for measurement of horizontal and vertical angle.

Last Answer : I) Procedure for measurement of horizontal angle with digital theodolite: 1) Taking out digital theodolite for box and fix it on tripod over required station. 2) Approximate leveling by leg adjustment and ... and take the reading at B. 9) Difference of two angle gives required vertical angle AOB

Description : Describe the temporary adjustment of digital level.

Last Answer : Temporary adjustment of digital level:- 1) Setup stability:- The digital level should be fixed by rotating its screw head on top of tripod stand. Set tripod legs wide apart to increase the stability ... several times if required. 5) Focus the telescope properly to get clear image of cross hairs .

Description : Describe the procedure for setup of total station.

Last Answer : Following steps are followed for the set up of total station 1. Set up the tripod approximately over the station point. 2. Remove the plastic cap from tripod and make tripod nearly level by stretching ... 7.Focusing of object glass. 8.Check the plate level from time to time during measurement .

Description : Describe the procedure to locate grade contour in field

Last Answer : Line joining the point along the same gradient is called contour gradient or grade contour. All the points on a contour have the same elevation. But all the points on a contour gradient do not ... on contour of RL 64. Similarly others points are established to obtain the grade contour on field.

Description : Describe the temporary adjustment of theodolite

Last Answer : Temporary adjustment of theodolite:- The following operations should be done as temporary adjustments before taking readings on any theodolite. 1. Setting of theodolite on tripod stand - The theodolite ... .e. cross hairs and object) simultaneously focussing of telescope is said to be completed.

Description : If is the length of a sub-chord and is the radius of simple curve, the angle of deflection  between its tangent and sub-chord, in minutes, is equal to  (A) 573 S/R (B) 573 R/S (C) 1718.9 R/S (D) 1718.9 S/R

Last Answer : (D) 1718.9 S/R

Description : If the radius of a simple curve is 600 m, the maximum length of the chord for calculating offsets, is  taken  (A) 15 m  (B) 20 m  (C) 25 m  (D) 30 m

Last Answer : (D) 30 m

Description : The radius of a simple circular curve is 300 m and length of its specified chord is 30 m. The degree of the curve is (A) 5.73° (B) 5.37° (C) 3.57° (D) 3.75°

Last Answer : (A) 5.73°

Description : State the possible error while using planimeter for finding area of an irregular figure.

Last Answer : Possible error while using planimeter for finding area of an irregular figure: 1) Instrumental Error i) Roller of planimeter which must rotate the axis freely and withot vibrations, if not, then ... vi) Error in setting of arm length. vii) Overlapping or repetition in tracing boundary.

Description : How the layout is done using total station?

Last Answer : Layout total station: 1. On the plan supplied by an architect, number the column serially from left to right and top to bottom starting from top left corner. 2. Work out ... of setting out by comparing the diagonal distance between the extreme column centres to their calculated values.