1. Where should the centre of gravity of the rail section be located?
a) Near to the bottom of the rail
b) close to the upper portion
c) close to the mid height
d) Can be anywhere between the section
Explanation: Huge number of stresses act on the railway track. For balancing the tensile and compressive stresses the centre of gravity of the rail section should be located near the mid height of the rail.
2. Which of the following is not a component of the rail?
a) Head
b) Web
c) Ballast
d) Foot
Explanation: The rail consists of three parts, a head, a web and a foot. Ballast is a separate component which is not a part of the rail section.
3. What is the reason that the head should have sufficient depth?
a) To sustain vertical wear
b) For lateral stiffness
c) To make it cheap
d) For proper maintenance
Explanation: For enduring vertical wear the head should have sufficient depth. For desired lateral stiffness it is made wider.
4. Why is the foot made wide?
a) To avoid corrosion
b) To avoid overturning
c) For making it cost efficient
d) For easy manufacturing
Explanation: The foot should be made wide enough to provide stability to the rail. It should resist the forces applied and should not be overturned.
5. The Factors like heaviest axle load, max permissible speed, depth of Ballast cushion are considered for deciding the _____ of the rail.
a) weight
b) length
c) section
d) weight and section
Explanation: A rail is designated by its weight per unit length. Its weight and section are decided after considering factors like heaviest axle load, speed, Ballast cushion etc.
6. What will be the maximum axle load (in tonnes) for rails of 52kg/m?
a) 29.12t
b) 30t
c) 37.62t
d) 22.5t
Explanation: Maximum axle load=560 x sectional weight of rail
=560 x 52kg/m
=29120kg
=29.12tonnes.
7. Shorter rails are economical and provide more comfort?
a) true
b) false
Explanation: Longer rails are much more economical and comfortable for rides. This is because longer rails reduce the number of joints, fittings and overall maintenance cost.
8. Which of the following is not true about Long rails?
a) It’s difficult to manufacture long rails
b) More internal stresses in long rails
c) Easy transportation facilities for long rails
d) Longer rails are economical
Explanation: The longer rails are difficult to be transported. They are economical but have disadvantages like heavy internal stresses and difficult manufacturing.
9. What can be done to prevent Hogging of rails?
a) Tilting of rails
b) Shovel packing
c) Scabbing of rails
d) Interchanging rails
Explanation: Hogging of rail can happen because of poor maintenance, faulty fastenings, etc. It can be prevented by measured shovel packing.
10. In which type of defect patches of metal fall from the rail table?
a) Scabbing of rails
b) Hogging of rails
c) Wheel burns
d) Corrugation of rails
Explanation: A metal chunk generally falls from the rail in case of scabbing of rails. An elliptical depression is created with cracks surrounding it.