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Electric Traction
Electric Traction
For three-phase induction motors which of the following is the least efficient method of speed control?
Combination of cascade and pole changing
Pole changing
Cascade control
Rheostat control
Combination of cascade and pole changing
Pole changing
Cascade control
Rheostat control
Answer
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Electric Traction
Which of the following is the advantage of electric braking?
It avoids wear of track
It is instantaneous
Motor continues to remain loaded during braking
More heat is generated during braking
It avoids wear of track
It is instantaneous
Motor continues to remain loaded during braking
More heat is generated during braking
Answer
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Electric Traction
Locomotives with monometer bogies have
Lot of skidding
Suitability for passenger as well as freight service
Uneven distribution of tractive effect
Low coefficient of adhesion
Lot of skidding
Suitability for passenger as well as freight service
Uneven distribution of tractive effect
Low coefficient of adhesion
Answer
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Electric Traction
Speed-time curve of main line service differs from those of urban and suburban services on following account
All of the listed here
It has longer free running period
Accelerating and braking periods are comparatively smaller
It has longer coasting period
All of the listed here
It has longer free running period
Accelerating and braking periods are comparatively smaller
It has longer coasting period
Answer
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Electric Traction
The efficiency of diesel locomotives is nearly
60 to 70 percent
30 to 40 percent
20 to 25 percent
45 to 55 percent
60 to 70 percent
30 to 40 percent
20 to 25 percent
45 to 55 percent
Answer
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