Electric Traction Quiz | Electric Traction Short Questions and Answers

41 The return circuit for tramcars is through
A neutral wire
B rails
C cables
D common earthing

Answer: rails
42 Overhead lines for power supply to tramcars are at a minimum height of
A 3 m
B 6 m
C 10 m
D 15 m

Answer: 10 m
43 In case of ________ free running and coasting periods are generally long.
A main-line service
B urban service
C sub-urban service
D all of the above

Answer: main-line service
44 Specific energy consumption is affected by which of the following factors ?
A Retardation and acceleration values
B Gradient
C Distance between stops
D All of the above

Answer: All of the above
45 have maximum unbalanced forces
A Diesel shunters
B Steam locomotives
C Electric locomotives
D Diesel locomotives

Answer: Steam locomotives
46 An ideal traction system should have
A easy speed control
B high starting tractive effort
C equipment capable of with standing large temporary loads
D all of the above

Answer: all of the above
47 Energy consumption in propelling the train is required for which of the following?
A Work against the resistance to motion
B Work against gravity while moving up the gradient
C Acceleration
D All of the above

Answer: All of the above
48 When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
A wheel base of axles is more
B degree of curvature is more
C both (a) and (b)
D none of the above

Answer: both (a) and (b)
49 Series motor is not suited for traction duty due to which of the following account ?
A Less current drain on the heavy load torque
B Current surges after temporary switching off supply
C Self relieving property
D Commutating property at heavy load

Answer: Current surges after temporary switching off supply
50 Locomotive having monomotor bogies
A has better coefficient of adhesion
B are suited both for passanger as well as freight service
C has better riding qualities due to the reduction of lateral forces
D has all above qualities

Answer: has all above qualities
51 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

Answer: all of the above
52 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

Answer: all of the above
53 For three-phase induction motors which of the following is the least efficient method of speed control ?
A Cascade control
B Pole changing
C Rheostat control
D Combination of cascade and pole changing

Answer: Rheostat control
54 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

Answer: 600 to 750 V
55 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

Answer: cleaned with sand
56 method can bring the locomotive to dead stop.
A Plugging braking
B Rheostatic braking
C Regenerative braking
D None of the above

Answer: Plugging braking
57 Battery operated trucks are used in
A steel mills
B power stations
C narrow gauge traction
D factories for material transportation

Answer: factories for material transportation
58 The resistance encountered by a train in 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

Answer: all of the above
59 Vacuum is created by which of the following?
A Vacuum pump
B Ejector
C Any of the above
D None of the above

Answer: Any of the above
60 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

Answer: Vacuum system