Railway Engineering Questions and Answers – Circular Curves

This set of Railway Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Circular Curves”.

1. Degree of curve is the angle subtended at its centre by a _______ chord.
a) 30.5ft
b) 100m
c) 30.5cm
d) 100ft
View Answer

Answer: d
Explanation: A curve is defined by its radius or by its degree. The degree of curve is the angle subtended at the curve’s centre by a 100ft or 30.5m chord.

2. Which of the following is the correct formula for the degree of curve?
a) 1750/R
b) 3500/R
c) 5370/R
d) 2000/R
View Answer

Answer: a
Explanation: Angle subtended by a 30.5m chord or degree of curve is given as 360°x30.5/2πR. This when simplified is equal to 1750/R, where R is in metres.

3. The maximum permissible degree of a curve on a track does not depend on which of the following?
a) Gauge
b) Wheel base
c) Maximum Permissible superelevation
d) Speed of train
View Answer

Answer: d
Explanation: The maximum permissible degree of curve on a track is determined by factors like gauge, wheel base and maximum permissible superelevation. After this the permissible speed of the train on track is determined.
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4. According to Tangential offset method which of the following is the correct relation between offset and length of chord?
a) On = Cn2/4R
b) On = Cn2/2R
c) On = Cn2/6R
d) On = Cn2/R
View Answer

Answer: b
Explanation: When we have to set out a short curve of length of around 100m, Tangential offset method can be used. The relation between offset and length of chord can be given as On = Cn2 /2R.

5. In Long chord offset method, how is the Versine V is calculated from long chord?
a) V = C2/πR
b) V = C2/8R
c) V = C2/5R
d) V = C2/18R
View Answer

Answer: b
Explanation: Versine is calculated as V = C2/8R, where C is the length of the long chord. The long chord is divided into 8 parts and then values of perpendicular offsets are calculated.
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6. Which of the following is also known as Rankine’s method?
a) Chord deflection method
b) Versine method
c) Theodolite method
d) Long chord offset method
View Answer

Answer: c
Explanation: Theodolite method is also known as Rankine’s method. It is particularly used when high accuracy is required. Curve is set with the help of Theodolite and a chain or tape.

7. If higher precision is required in Rankine’s method, 2 theodolites can also be used.
a) True
b) False
View Answer

Answer: a
Explanation: The theodolite is set at a point and rotated through deflection angles which are already calculated. For higher precision two Theodolites can be used instead of one.
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Sanfoundry Global Education & Learning Series – Railway Engineering.

To practice all areas of Railway Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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