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.Management Sciences
Category: Electric Traction
Power for lighting in passanger coach, in a long distance electric train, is provided_________________?
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A. directly through overhead electric line
B. through individual generator of bogie and batteries
C. through rails
D. through locomotive
Long distance railways use which of the following ?
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.
If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
A. 0.3
B. 0.26
C. 0.225
D. 0.16
Which of the following is the voltage for single phase A.C. system ?
A. 22 V
B. 440 V
C. 5 kV
D. 15 kV
E. None of the above
The friction at the track is proportional to________________?
A. 1/speed
B. l/(speed)2
C. speed
D. none of the above
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
For 25 kV single phase system power supply frequency is_______________?
A. 60 Hz
B. 50 Hz
C. 25 Hz
D. 16 Hz
The overall efficiency of steam locomotive is around_____________?
A. 5 to 10 percent
B. 15 to 20 percent
C. 25 to 35 percent
D. 35 to 45 percent
In case of steam engines the steam pressure is_______________?
A. 1 to 4 kgf/cm2
B. 5 to 8 kgf/cm2
C. 10 to 15 kgf/cm2
D. 25 to 35 kgf/cm2
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