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
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
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
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
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
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
have maximum unbalanced forces_______________?
(A) Diesel shunters
(B) Steam locomotives
(C) Electric locomotives
(D) Diesel locomotives
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
The return circuit for tramcars is through_______________?
(A) neutral wire
(B) rails
(C) cables
(D) common earthing
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