Deck 12: Traction Systems and Locomotive Performance

Question 1

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 1

all of the above

Question 2

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 2

all of the above

Question 3

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 3

has all above qualities

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

have maximum unbalanced forces

A)Diesel shunters
B)Steam locomotives
C)Electric locomotives
D)Diesel locomotives

Question 9

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

Question 10

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

Question 11

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

Question 12

The return circuit for tramcars is through

A)neutral wire
B)rails
C)cables
D)common earthing

Question 13

_______ frequency is not common in low frequency traction system

A)40 Hz
B)25 Hz
C)16 Hz
D)all of the above

Question 14

For 25 kV single phase system power supply frequency is

A)60 Hz
B)50 Hz
C)25 Hz
D)16 Hz

Question 15

Power for lighting in passanger coach, in a long distance electric train, is provided

A)directly through overhead electric line
B)through individual generator of bogie and batteries
C)through rails
D)through locomotive

Question 16

In India, electrification of railway track was done for the first time in which of the following years ?

A)1820-1825
B)1880-1885
C)1925-1932
D)1947-1954

Question 17

Which of the following happens in Kando system ?

A)Three phase A.C.is converted into D.C.
B)Single phase A.C.is converted into D.C.
C)Single phase supply is converted into three phase system
D)None of the above

Question 18

For which of the following locomotives the maintenance requirements are the least?

A)Steam locomotives
B)Diesel locomotives
C)Electric locomotives
D)Equal in all of the above

Question 19

Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?

A)Reduced current method
B)Tap changing control of transformer
C)Series parallel operation of motors
D)All of the above

Question 20

The most suitable servo-motor application is __________

A)AC series motor
B)DC series motor
C)AC two-phase induction motor
D)DC shunt motor

Question 21

the value of the frequency of the DC supply.

A)0 Hz
B)50 Hz
C)20 Hz
D)10 Hz