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Free download in PDF Electric Traction Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
The return circuit for tramcars is through
[A]
neutral wire
[B]
rails
[C]
cables
[D]
common earthing
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
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
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
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
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
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
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
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
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
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
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
59
Vacuum is created by which of the following?
[A]
Vacuum pump
[B]
Ejector
[C]
Any of the above
[D]
None 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
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