Gauges, Rails and Sleepers

JKSSB Junior Engineer (Civil) · Railway Engineering · 19 practice questions with answers and explanations: 16 Easy, 2 Medium, 1 Hard.

Sample questions

Sample Easy question 1

The broad gauge is wider than the metre gauge by:

  1. 676 mm
  2. 435 mm
  3. 576 mm
  4. 914 mm
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Answer: A. 1,676 − 1,000 = 676 mm.

Sample Easy question 2

The gauge of a railway track is measured between:

  1. The inner faces of the two rails, 13 mm below the rail top
  2. The centres of the two rails
  3. The outer faces of the rails
  4. The sleepers
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Answer: A. It is the distance between the running faces of the rails.

Sample Easy question 3

A fish plate is used to:

  1. Hold the rail to the sleeper
  2. Guide the wheel flange
  3. Join the ends of two rails
  4. Carry the ballast
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Answer: C. Fish bolts and nuts hold the fish plates to the rail ends.

Sample Medium question 4

A 13 m rail of 52 kg/m section weighs:

  1. 260 kg
  2. 676 kg
  3. 52 kg
  4. 1,352 kg
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Answer: B. 52 × 13 = 676 kg.

Sample Medium question 5

The narrow gauges used in India are 762 mm and:

  1. 1,000 mm
  2. 1,435 mm
  3. 610 mm
  4. 914 mm
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Answer: C. They are used on hill and light railways.

Sample Hard question 6

A rail of 13 m (13,000 mm) expands by αLΔT for a rise of 40°C with α = 11.5 × 10⁻⁶ per °C. The expansion is about:

  1. 6 mm
  2. 60 mm
  3. 0.6 mm
  4. 12 mm
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Answer: A. ΔL = 11.5 × 10⁻⁶ × 13,000 × 40 = 5.98 mm, which is why an expansion gap is left between rails.

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