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This set of Railway Engineering Multiple Choice Questions on “Concrete Sleepers”.
1. Which of the following is not an advantage of Concrete sleepers?
a) They have long lifespans
b) They can be mass produced
c) They have high scrap value
d) They are not liable to corrosion
Answer: c
Clarification: Concrete sleepers have long service life and do not corrode. But they have no scrap value because concrete once set hard cannot be remoulded or reused.
2. Why concrete sleepers can be used in Track circuited areas?
a) They are heavy
b) They are bad conductors of electricity
c) They do not corrode
d) They are easy to handle
Answer: b
Clarification: Concrete sleepers are inflammable and do not corrode. They are bad conductors of electricity and thus can be used in track circuited areas.
3. The monoblock prestressed concrete sleepers are similar to which sleepers?
a) German B-58
b) PCS-12 and PCS-14
c) Cast Iron sleepers
d) Mono block post-tension concrete
Answer: a
Clarification: The mono-block prestressed concrete sleepers have a length of 2750mm and 270kg weight. They are similar to German B-58 type of sleeper.
4. What is the general 28-day crushing strength of concrete for mono block prestressed concrete type sleeper?
a) 525kg/cm2
b) 600kg/cm2
c) 1676kg/cm2
d) 100kg/cm2
Answer: a
Clarification: The 28-day crushing strength of concrete for this sleeper should not be less than 525kg/cm2. The initial prestressing of steel is 100kg/cm2.
5. The two-block concrete sleepers have longer life than mono block sleepers.
a) True
b) False
Answer: b
Clarification: In two-block concrete sleepers the tie has shorter life span. Thus mono block sleepers have longer life than two-block concrete sleepers.
6. Why is the manufacturing cost of mono-block prestressed concrete sleepers more?
a) They have ties
b) They require prestressed concrete
c) They have long life
d) They break easily
Answer: b
Clarification: Two-block concrete sleepers require simple RCC for manufacturing. Thus they are cheap than mono-block prestressed concrete sleepers.
7. What guides the train from one line of rail tracks to another?
a) Turnout
b) Ballast
c) Gauge
d) Fastenings
Answer: a
Clarification: Turnout is a mechanism which enables the trains to move from one track to another. Fastenings are used to hold various components of the track together.
8. In post tensioned type of sleeper how is the force transferred to the concrete?
a) Through positive anchors
b) Through bonds
c) Through bonds and positive anchors
d) Through fastenings
Answer: a
Clarification: In post tensioned type of sleeper the force transferred to the concrete is only through positive anchors. But in pre-tensioned it is through bonds and positive anchors.
9. Which method is used for manufacturing of mono-block concrete sleepers?
a) Short-line method
b) Long-line method
c) Lorry method
d) Ultimate stress method
Answer: b
Clarification: Mono-block concrete sleepers are usually manufactured by Long-line method. Sometimes stress bench method is adopted.
10. Concrete sleepers should not be laid at new formations unless specially compacted.
a) True
b) False
Answer: a
Clarification: The concrete sleepers are very heavy and can cause harm to new formations. Thus laying them at new formations is generally avoided.