1. What is Photo-elastic method used for?
a) For measuring stresses on the rail
b) For measuring strain of the rail
c) For calculating depth of ballast
d) For Reconnaissance survey
Explanation: Photo-elastic method is used for measuring stresses on the rail. Indian railway mostly uses Electric resistance strain gauge method for the measurement of stresses.
2. What is the objective of coning of wheels?
a) To save material
b) For easy manufacturing of wheels
c) For easy movement on curves
d) For Aesthetic look
Explanation: Rather than making the wheels flat they are sloped like a cone. This is done so that the wheels can traverse curves easily.
3. What is the value of Slope provided to the wheels?
a) 1 in 30
b) 1 in 20
c) 1 in 40
d) 1 in 15
Explanation: The inner diameter of the wheels of the locomotive is greater than the outer diameter. The value of this slope is 1 in 20.
4. What would be the result without coning of wheels?
a) Trains would have travelled slower
b) The flange would have touched the rail
c) Carrying capacity of the train would have reduced
d) Passengers would feel more comfortable
Explanation: Without coning of wheels the flat wheels might slip on the tracks during traversing a curve. This would lead to contact of flange and rail track. This would lead to uncomfortable journey.
5. What is the reason that disables the leading axle to take full advantage of the coning of wheels?
a) Rigidity of the frame
b) Unequal diameter of wheels
c) Sharp curves
d) More speed
Explanation: Because of the rigidity of the frame, while moving on a horizontal curve the rear axle moves inwards. Due to this the front axle is unable to take full advantage of coning of wheels.
6. Coning of wheels helps the outer wheel to travel a longer distance than inner wheel.
a) true
b) false
Explanation: When the locomotive travels a curve centrifugal force acts on it. Due to this the outer wheel moves outwards and has to travel longer distance as compared to the inner wheel. Thus coning of wheels is done.
7. Which among the following is the correct formula for calculating the slip?
a) Slip=(2πθ/360)xG
b) Slip=(πθ/360)xG
c) Slip=(4πθ/360)xG
d) Slip=(2πθ/360)xG2
Explanation: The slip can be calculated as Slip=(2πθ/360)xG, where G is the gauge in metres. The approximate value of the slip for broad gauge is 0.029 metre per degree of the curve.
8. The rails are tilted at a slope which is twice the slope of the wheel cone.
a) true
b) false
Explanation: The rails are tilted at a slope of 1 in 20 which is same as that of the wheel cone.
9. What is the reason for development of Lateral Bending stresses in the rail?
a) Tilting of rails
b) Coning of wheels
c) Centrifugal forces
d) Eccentric loading of rails
Explanation: The load of the wheel acts at a distance from the axis of the wheel. This creates eccentric loading which causes development of Lateral Bending stresses in the rail.
10. Why are the rails Tilted?
a) To reduce wear and tear
b) For cost efficiency
c) For manufacturing ease
d) To keep them in position
Explanation: Maximum load of the wheel acts near the inner edge of the rail. This causes wear and tear of rails. For the reduction of wear and tear the rails are tilted.