Electric Traction On Tramways Multiple Choice Questions and Answers
31. In tramways
A. The power is supplied at 600 V DC is from a single overhead conductor of positive polarity
B. The speed is controlled by field weakening or series parallel control
C. Rheostatic and mechanical breaking are employed for normal service
D. All of the above
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D. All of the above
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32. For tramways the return circuit is
A. Track rails
B. Neutral where
C. Common earthing
D. Cables
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33. Unlike a tramway a trolley bus needs no
A. Driving axles
B. Running rail
C. Hand breaks
D. Overhead contact wire
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34. Ordinary tramway is the most economical means of transport for
A. Very dense traffic in large cities
B. Rural services
C. Suburban services
D. All of the above
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35. For 600 V DC line for tram cars, track is connected to the
A. Positive of the supply
B. Negative of the supply
C. Midvoltage of 300 V
D. None of the above
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