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Free download in PDF Electric Traction Objective Type 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.
(21)
The pulsating torque exerted by steam locomotives causes which of the following?
[A]
Jolting and skidding
[B]
Hammer blow
[C]
Pitching
[D]
All of the above
Answer: Jolting and skidding
(22)
The normal value of adhesion friction is
[A]
0.12
[B]
0.25
[C]
0.40
[D]
0.75
(23)
The air resistance to the movement of the train is proportional to
[A]
speed
[B]
(speed)
[C]
1/speed
[D]
None of the above
(24)
The friction at the track is proportional to
[A]
1/speed
[B]
l/(speed)2
[C]
speed
[D]
none of the above
(25)
The specific energy consumption of a train depends on which of the following ?
[A]
Acceleration and retardation
[B]
Gradient
[C]
Distance covered
[D]
All of the above
(26)
The rate of acceleration on suburban orurban services is restricted by the consideration of
[A]
Engine power
[B]
Track curves
[C]
Passenger Discomfort
[D]
Track size
Answer: Passenger Discomfort
(27)
Speed-time curve of main line service differs from those of urban and suburban services on following account
[A]
it has longer free running period
[B]
it has longer coasting period
[C]
accelerating and braking periods are comparatively smaller
[D]
All of the above
(28)
Co-efficient of adhesion is
[A]
high in case of D.C. traction than in the case of AC. traction
[B]
low in case of D.C. traction than in the case of AC. traction
[C]
equal in both AC. and D.C. traction
[D]
any of the above
Answer: low in case of D.C. traction than in the case of AC. traction
(29)
Which of the following is the disadvantage of electric traction over other systems of traction ?
[A]
Corrosion problems in the under-ground pipe work
[B]
Short time power failure interrupts traffic for hours
[C]
High capital outlay in fixed installations beside route limitation
[D]
Interference with communication lines
Answer: High capital outlay in fixed installations beside route limitation
(30)
Quadrilateral speed-time curve pertains to which of the following services ?
[A]
Main line service
[B]
Urban service
[C]
Sub-urban service
[D]
Urban and sub-urban service
Answer: Urban and sub-urban service
31
Due to which of the following co-efficient of adhesion improves ?
[A]
Rust on the rails
[B]
Dust on the rails
[C]
Sand on the rails
[D]
All of the above
32
Co-efficient of adhesion reduces due to the presence of which of the following ?
[A]
Sand on rails
[B]
Dew on rails
[C]
Oil on the rails
[D]
both (b) and (c)
33
For given maximum axle load tractive efforts of AC. locomotive will be
[A]
less than that of D.C. locomotive
[B]
more than that of D.C. locomotive
[C]
equal to that of D.C. locomotive
[D]
none of the above
Answer: more than that of D.C. locomotive
34
Tractive effort is required to
[A]
overcome the gravity component of train mass
[B]
overcome friction, windage and curve resistance
[C]
accelerate the train mass
[D]
do all of the above
Answer: do all of the above
35
Which of the following braking systems on the locomotives is costly ?
[A]
Regenerative braking on electric locomotives
[B]
Vacuum braking on diesel locomotives
[C]
Vacuum braking on steam locomotives
[D]
All braking systems are equally costly
Answer: Regenerative braking on electric locomotives
36
Which of the following is the advantage of electric braking ?
[A]
It avoids wear of track
[B]
Motor continues to remain loaded during braking
[C]
It is instantaneous
[D]
More heat is generated during braking
Answer: It avoids wear of track
37
Which of the following state capitals is not on broad gauge track ?
[A]
Lucknow
[B]
Bhopal
[C]
Jaipur
[D]
Chandigarh
38
The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to
[A]
5
[B]
10
[C]
14
[D]
17
39
The speed of a superfast train is
[A]
60 kmph
[B]
75 kmph
[C]
100 kmph
[D]
more than 100 kmph
Answer: more than 100 kmph
40
The efficiency of diesel locomotives is nearly
[A]
20 to 25 percent
[B]
30 to 40 percent
[C]
45 to 55 percent
[D]
60 to 70 percent
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