Important Electric Traction Multiple Choice Questions and Answers
46. Vacuum is created by
A. Vacuum pumps
B. Ejector
C. Vacuum pump or ejector
D. None of the above
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C. Vacuum pump or ejector
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47. Overhead lines for power supply to tram cars are at a minimum height of a
A. 10 m
B. 8 m
C. 5 m
D. 15 m
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48. DC track circuit consists of
A. Amplitude modulation equipment
B. A negative booster, feeding points and signals
C. Insulated joint and track, track bonding, regulating resistance
D. All of the above
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49. Advantages of two stage pantograph is
A. Inertia forces are reduced
B. Takes care of variation in contact height and displacement of contact wire between supports
C. Takes care of low amplitude displacement of contact wire between droppers
D. All of the above
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50. Span length between supports in electric traction is determined by
A. Weight of wire per unit length
B. Maximum wind pressure
C. Permissible tension in the wire and speed of train
D. All of the above
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