Electric Traction Objective type Questions and Answers pdf

41.    Which of the following braking systems is used on steam locomotives ?
(a)     Hydraulic system
(b)     Pneumatic system
(c)    Vacuum system
(d)    None of the above
Ans: c

42.    Vacuum is created by which of the following?
(a)     Vacuum pump
(b)     Ejector
(c)    Any of the above
(d)    None of the above
Ans: c

43.    The resistance encountered by a trainin motion is on account of
(a)    resistance offered by air
(b)    friction at the track
(c)    friction at various parts of the rolling stock
(d)    all of the above
Ans: d

44.   Battery operated trucks are used in
(a)     steel mills 
(b)     power stations
(c)    narrow gauge traction
(d)    factories for material transportation
Ans: d

45    method can bring the locomotive to dead stop.
(a)     Plugging braking
(b)     Rheostatic braking
(c)     Regenerative braking
(d)     None of the above
Ans: a

46.    The value of co-efficient of adhesion will be high when rails are
(a)     greased 
(b)     wet
(c)    sprayed with oil
(d)    cleaned with sand
Ans: d

47.    The voltage used for suburban trains in D.C. system is usually
(a)     12 V 
(b)     24 V
(c)     220 V 
(d)     600 to 750 V
Ans: d

48.    For three-phase induction motors which of the following is the least efficient method of speed control ?
(a)     Cascade control
(b)     Pole changing
(c)    Rheostatic control
(d)    Combination of cascade and pole changing
Ans: c

49.    Specific energy consumption becomes
(a)      more on steeper gradient
(b)      more with high train resistance
(c)    less if distance between stops is more
(d)    all of the above
Ans: d

50.    In main line service as compared to urban and suburban service
(a)    distance between the stops is more
(b)    maximum speed reached is high
(c)    acceleration and retardation rates are low
(d)    all of the above
Ans: d

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