Important Electric Traction Multiple Choice Questions and Answers

41.  Longer coasting period for a train results in

   A. Higher schedule speed

   B. Lower specific energy consumption

   C. Higher retardation

   D. Higher acceleration

42.  The method of speed control adopted in 25KV, single phase, 50 HZ traction is

   A. Tap changing control of transformer

   B. Reduced current method

   C. Series parallel control

   D. Rheostatic control

43.  In motor generator locomotive control

   A. Rheostatic control is used

   B. Series parallel control is used

   C. The output voltages of generator is regulated by means of a field control from exciter

   D. Any of the above

44.  The preferable method of speed control of linear induction motor is

   A. Variable flux control

   B. PAM Control

   C. Variable frequency and a constant voltage control

   D. Variable frequency and variable voltage control

45.  Which off the following braking systems on the locomotives is costly ?

   A. Vacuum breaking on steam locomotives

   B. Vacuum breaking on diesel locomotives

   C. Regenerative breaking on electric locomotives

   D. All braking systems are equally costly

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