Electrical Engineering MCQs

Page No. 48

Which of the following braking systems is used on steam locomotives ?


aHydraulic system


b Pneumatic system


c Vacuum system


dNone of the above


View Answer None of the above

The rate of acceleration on suburban orurban services is restricted by the consideration of______________?


aEngine power


bTrack curves


c Passenger Discomfort


dTrack size


View Answer Track size

The friction at the track is proportional to________________?


a1/speed


bl/(speed)2


cspeed


dnone of the above


View Answer speed

The normal value of adhesion friction is______________?


a0.12


b 0.25


c0.40


d0.75


View Answer 0.75

Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?


ait has longer free running period


b it has longer coasting period


caccelerating and braking periods are comparatively smaller


d all of the above



The specific energy consumption of a train depends on which of the following ?


aAcceleration and retardation


bGradient


cDistance covered


dAll of the above


View Answer All of the above

The air resistance to the movement of the train is proportional to_____________?


aspeed


b(speed)


c(speed)


d1/speed


View Answer (speed)

The pulsating torque exerted by steam locomotives causes which of the following ?


aJolting and skidding


bHammer blow


c Pitching


d All of the above


View Answer Jolting and skidding

Co-efficient of adhesion reduces due to the presence of which of the following ?


aSand on rails


bDew on rails


cOil on the rails


dboth B. and C.


View Answer both B. and C.

Tractive effort is required to_____________?


aovercome the gravity component of train mass


bovercome friction, windage and curve resistance


c accelerate the train mass


ddo all of the abovedo all of the above


View Answer do all of the above

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