The air resistance to the movement of the train is proportional to_____________?
(A) speed
(B) (speed)
(C) (speed)
(D) 1/speed
The pulsating torque exerted by steam locomotives causes which of the following ?
(A) Jolting and skidding
(B) Hammer blow
(C) Pitching
(D) All of the above
Co-efficient of adhesion reduces due to the presence of which of the following ?
(A) Sand on rails
(B) Dew on rails
(C) Oil on the rails
(D) both
Battery operated trucks are used in________________?
(A) steel mills
(B) power stations
(C) narrow gauge traction
(D) factories for material transportation
Vacuum is created by which of the following ?
(A) Vacuum pump
(B) Ejector
(C) Any of the above
(D) None of the above
_______________method can bring the locomotive to dead stop?
(A) Plugging braking
(B) Rheostatic braking
(C) Regenerative braking
(D) None of the above
The voltage used for suburban trains in D.C. system is usually_______________?
(A) 12 V
(B) 24 V
(C) 220 V
(D) 600 to 750 V
Specific energy consumption becomes________________?
(A) more on steeper gradient
(B) more with high train resistance
(C) less if distance between stops is more
(D) all of the above
The value of co-efficient of adhesion will be high when rails are_________________?
(A) greased
(B) wet
(C) sprayed with oil
(D) cleaned with sand
For three-phase induction motors which of the following is the least efficient method of speed control ?
(A) Cascade control
(B) Pole changing
(C) Rheostat control
(D) Combination of cascade and pole changing