Deck 11: Locomotives and Train Systems

Question 1

For diesel locomotives the range of horsepower is

A)50 to 200
B)500 to 1000
C)1500 to 2500
D)3000 to 5000

Answer 1

1500 to 2500

Question 2

_______ locomotive has the highest operational availability.

A)Electric
B)Diesel
C)Steam
D)none

Answer 2

Electric

Question 3

The horsepower of steam locomotives is

A)upto 1500
B)1500 to 2000
C)2000 to 3000
D)3000 to 4000

Answer 3

upto 1500

Question 4

The overall efficiency of steam locomotive is around

A)5 to 10 percent
B)15 to 20 percent
C)25 to 35 percent
D)35 to 45 percent

Question 5

In tramways which of the following motors is used ?

A)D.C.shunt motor
B)D.C.series motor
C)A.C.three phase motor
D)AC.single phase capacitor start motor

Question 6

In a steam locomotive electric power is provided through

A)overhead wire
B)battery system
C)small turbo-generator
D)diesel engine generator

Question 7

Which of the following drives is suitable for mines where explosive gas exists ?

A)Steam engine
B)Diesel engine
C)Battery locomotive
D)Any of the above

Question 8

Overload capacity of diesel engines is usually restricted to

A)2 percent
B)10 percent
C)20 percent
D)40 percent

Question 9

The wheels of a train, engine as well as bogies, are slightly tapered to

A)reduce frietion
B)increase friction
C)facilitate braking
D)facilitate in taking turns

Question 10

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

Question 11

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

Question 12

Which of the following braking systems on the locomotives is costly ?

A)Regenerative braking on electric locomotives
B)Vacuum braking on diesel locomo-tives
C)Vacuum braking on steam locomo-tives
D)All braking systems are equally costly

Question 13

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

Question 14

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

Question 15

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

Question 16

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 instal-lations beside route limitation
D)Interference with communication lines

Question 17

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

Question 18

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

Question 19

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

Question 20

The friction at the track is proportional to

A)1/speed
B)l/(speed)2
C)speed
D)none of the above

Question 21

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

Question 22

Battery operated trucks are used in

A)steel mills
B)power stations
C)narrow gauge traction
D)factories for material transportation

Question 23

method can bring the locomotive to dead stop.

A)Plugging braking
B)Rheostatic braking
C)Regenerative braking
D)None of the above

Question 24

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

Question 25

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