Points, Crossings, Signals and Bridges

JKSSB Junior Engineer (Civil) · Railway Engineering · 22 practice questions with answers and explanations: 19 Easy, 1 Medium, 2 Hard.

Sample questions

Sample Easy question 1

The purpose of interlocking is to:

  1. Reduce the gauge
  2. Increase the train speed
  3. Lubricate the points
  4. Prevent conflicting signals and point settings
Show answer

Answer: D. A signal cannot be cleared unless the route is safe.

Sample Easy question 2

In the railway colour light signals, a yellow aspect means:

  1. Shunt
  2. Caution, be ready to stop at the next signal
  3. Proceed at full speed
  4. Stop
Show answer

Answer: B. Green means proceed and red means stop.

Sample Easy question 3

A culvert is a bridge with a span of up to:

  1. 6 m
  2. 0.6 m
  3. 60 m
  4. 600 m
Show answer

Answer: A. Larger spans are minor and major bridges.

Sample Medium question 4

A 1 in 12 crossing has a crossing angle of about:

  1. 2.4°
  2. 9.5°
  3. 0.08°
  4. 4.8°
Show answer

Answer: D. The angle α satisfies cot α = 12, so α = 4.76°.

Sample Hard question 5

By Lacey's formula the normal scour depth is R = 0.473 (Q ÷ f)^(1/3). For Q = 1,400 m³/s and a silt factor f = 1, R is about:

  1. 2.6 m
  2. 17.7 m
  3. 5.3 m
  4. 10.6 m
Show answer

Answer: C. R = 0.473 × (1,400)^(1/3) = 5.29 m. The foundation is taken below the maximum scour depth.

Sample Hard question 6

A 1 in 12 crossing compared with a 1 in 8.5 crossing is:

  1. Gentler, allowing higher speed
  2. Sharper, allowing lower speed
  3. The same
  4. Used only for narrow gauge
Show answer

Answer: A. A larger number means a smaller angle of crossing.

More Railway Engineering topics for JKSSB Junior Engineer (Civil)