Questions
42
Overhead lines for power supply to tramcars are at a minimum height of
Answer: 10 m
43
In case of ________ free running and coasting periods are generally long.
Answer: main-line service
44
Specific energy consumption is affected by which of the following factors ?
Answer: All of the above
47
Energy consumption in propelling the train is required for which of the following?
Answer: All of the above
48
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
Answer: both (a) and (b)
49
Series motor is not suited for traction duty due to which of the following account ?
Answer: Current surges after temporary switching off supply
51
In main line service as compared to urban and suburban service
Answer: all of the above
53
For three-phase induction motors which of the following is the least efficient method of speed control ?
Answer: Rheostat control
54
The voltage used for suburban trains in D.C. system is usually
Answer: 600 to 750 V
55
The value of co-efficient of adhesion will be high when rails are
Answer: cleaned with sand
57
Battery operated trucks are used in
Answer: factories for material transportation
58
The resistance encountered by a train in motion is on account of
Answer: all of the above
60
Which of the following braking systems is used on steam locomotives ?
Answer: Vacuum system
