Compound Curve Setting - Surveying Questions and Answers

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Setting out Compound Curve”.

1. The observations made for setting a compound curve must be equal to_________
a) 180-(Δ/2)
b) 180-(Δ1/2)
c) 180-(Δ2/2)
d) 180+(Δ/2)
View Answer

Answer: a
Explanation: The points which are plotted for setting a compound curve involve a check at the last for determining the errors. The check can be given as 180-(Δ/2). Here, Δ is the deflection angle at P.I.

2. A compound curve can be set by which of the following methods?
a) Two-theodolite method
b) Deflection angles
c) Bisection of arcs
d) Tacheometric method
View Answer

Answer: b
Explanation: Since a compound curve involves a combination of both long and short curves, it is best to adopt the deflection angles method so that work can be completed with accurate values.

3. In a compound curve, the point at which both the long curve and short curve will meet is called_________
a) Point of radius
b) Point of curvature curve
c) Point of compound curve
d) Point of deflection curve
View Answer

Answer: c
Explanation: The point at which both the long curve and short curve will meet is determined as point of compound curve or P.C.C. It is the point where point of intersection lies perpendicular to P.C.C.

4. For setting a compound curve, the theodolite is first placed at______________
a) P.I
b) P.C.C
c) P.T
d) P.C
View Answer

Answer: d
Explanation: Generally, a compound curve can be set by the method of deflection angles. In this method, the theodolite is placed at point of curve (P.C) and later at P.C.C for obtaining long curve.

5. Find the value of radius of curvature, if the degree of the curve is given as 7˚.
a) 136.71 m
b) 163.17 m
c) 163.71 m
d) 613.71 m
View Answer

Answer: c
Explanation: The radius of curvature can be determined by
R = 1146 / D. On substitution, we get
R = 1146 / 7˚
R = 163.71 m.

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6. Determine the value of long curve length of a compound curve, if the radius of curvature is given as 56.87m and the deflection angle is given as 65˚43ꞌ.
a) 56.22m
b) 65.22m
c) 65.44m
d) 69.22m
View Answer

Answer: b
Explanation: The long curve length can be determined by using the formula,
t = R*θ*π/180. On substitution, we get
t = 56.87*65˚43ꞌ*π/180
t = 65.22m.

7. Find the value of the chainage of T1 by using the chainage of P.I and the tangent distance is given as 1024.31m and 707.57m.
a) 616.74m
b) 313.74m
c) 613.74m
d) 316.74m
View Answer

Answer: d
Explanation: The chainage of T1 can be calculated as,
Chainage of T1 = chainage of P.I – T_s. On substitution, we get
Chainage of T1 = 1024.31-707.57
Chainage of T1 = 316.74m.

8. Determine the short curve tangent distance by using the short curve and long curve tangent lengths given as 54.98m and 89.32m. The deflection angles at P.I and at long curve are given as 86˚45ꞌ and 43˚31ꞌ.
a) 154.5 m
b) 145.5 m
c) 514.5 m
d) 451.5 m
View Answer

Answer: a
Explanation: The short curve tangent distance can be determined by using the formula,
\(T = t_s + (t_s + t_l)* \frac{sin θ_2}{sin θ}.\) On substitution, we get
\(T = 54.98 + (54.98 + 89.32)* \frac{sin 43˚31ꞌ}{sin 86˚45ꞌ}\)
T = 154.5 m.

9. Find the chainage of second tangent point, if the chainage at the point of compound curve is given as 2345.87m and the curve length can be given as 568.54m.
a) 2941.41 m
b) 9214.41 m
c) 2914.14 m
d) 2914.41 m
View Answer

Answer: d
Explanation: The chainage at T₂ can be given as,
Chainage at T₂ = chainage at P.C.C + curve length. On substitution, we get
Chainage at T₂ = 2345.87 + 568.54
Chainage at T₂ = 2914.41 m.

10. All the necessary calculations will be done before setting the curve.
a) True
b) False
View Answer

Answer: b
Explanation: The determination of tangent length, curve length, tangent distance will be done after setting of the curve, but not before. The curve setting process actually involves in the determination of these. By using the required data further process can be done.

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