A. resistance offered by air
B. friction at the track
C. friction at various parts of the rolling stock
D. all of the above
Related Mcqs:
- The air resistance to the movement of the train is proportional to_____________?
A. speed
B. (speed)
C. (speed)
D. 1/speed - The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
A. R Ω
B. 2R Ω
C. 4R Ω
D. 8R Ω - In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?
A. RC + RL
B. RC || RL
C. RL
D. RC - If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?
A. RL + RC
B. RC || RL
C. RL – RC
D. RC - The wheels of a train, engine as well as bogies, are slightly tapered to_____________?
A. reduce friction
B. increase friction
C. facilitate braking
D. facilitate in taking turns - The speed of a superfast train is______________?
A. 60 kmph
B. 75 kmph
C. 100 kmph
D. more than 100 kmph - The specific energy consumption of a train depends on which of the following ?
A. Acceleration and retardation
B. Gradient
C. Distance covered
D. All of the above - Energy consumption in propelling the train is required for which of the following?
A. Work against the resistance to motion
B. Work against gravity while moving up the gradient
C. Acceleration
D. All of the above - Power for lighting in passanger coach, in a long distance electric train, is provided_________________?
A. directly through overhead electric line
B. through individual generator of bogie and batteries
C. through rails
D. through locomotive - Series motor is not suited for traction duty due to which of the following account ?
A. Less current drain on the heavy load torque
B. Current surges after temporary switching off supply
C. Self relieving property
D. Commutating property at heavy load
