A. 200 V D.C.
B. 25 kV single phase A.C.
C. 25 kV two phase A.C.
D. 25 kV three phase A.C.
Related Mcqs:
- 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 - Long distance transmission is easy for________________?
A. D.C voltage
B. A.C voltage
C. Half A.C voltage
D. Half D.C voltage - For long distance transmission the transformer used is_____________?
A. Step down
B. Input voltage and output voltage remain same
C. Step up
D. Amplifier is used - Electric intensity at infinite distance from the point charge is_____________?
A. zero
B. infinite
C. positive
D. negative - Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
A. 1/4th of its original value
B. 1/8th of its original value
C. 4 times of its original value
D. 8 times of its original value - If the distance between the two point charges become half then force between them becomes______________?
A. double
B. half
C. four times
D. remains same - Due to which of the following co-efficient of adhesion improves ?
A. Rust on the rails
B. Dust on the rails
C. Sand on the rails
D. All of the above - Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
A. it has longer free running period
B. it has longer coasting period
C. accelerating and braking periods are comparatively smaller
D. all of the above - Which of the following is the disadvantage of electric traction over other systems of traction ?
A. Corrosion problems in the under-ground pipe work
B. Short time power failure interrupts traffic for hours
C. High capital outlay in fixed installations beside route limitation
D. Interference with communication lines
C. All of the above - Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
A. Reduced current method
B. Tap changing control of transformer
C. Series parallel operation of motors
D. All of the above
