Electric Traction MCQ

101. Overhead lines for power supply to tram cars are at a minimum height of a

(a) 10 m
(b) 8 m
(c) 5 m
(d) 15 m


102. The current collector that can be employed with different speeds under all wind conditions and stiffness of OHE is known as the

(a) messenger collector.
(b) pantograph collector.
(c) trolley collector.
(d) bow collector.


103. DC track circuit consists of

(a) amplitude modulation equipment.
(b) a negative booster, feeding points and signals.
(c) insulated joint and track, track bonding, regulating resistance, track battery to track relay.
(d) all of the above.


104. In case of bow and pantograph current collectors

(a) the pantograph current collector is employed for large currents at higher speeds.
(b) the pantograph current collector is employed for large currents at lower speeds.
(c) the bow current collector is employed for large currents at higher speeds.
(d) the bow current collector is employed for large currents at lower speeds.


105. Contact with wire is maintained by

(a) air pressure in both bow and pantograph current collectors.
(b) springs in both bow and pantograph current collectors.
(c) spring in case of bow and air pressure in case of pantograph.
(d) spring in case of pantograph and air pressure in case of bow collectors.


106. Factors affecting quality of current collection in pantograph is/are

(a) contact pressure.
(b) effective mass of frame and span.
(c) adequate damping in the frame.
(d) all of the above.


107. Advantages of two-stage pantograph is/are

(a) inertia forces are reduced.
(b) takes care of variation in contact height and displacement of contact wire between supports.
(c) takes care of low amplitude displacement of contact wire between droppers.
(d) all of the above.


108. Span length between supports in electric traction is determined by

(a) weight of wire per unit length.
(b) maximum wind pressure.
(c) permissible tension in the wire and speed of train.
(d) all of the above.


109. Electrical circuit breaker is

(a) connected between the current collector and the main wiring.
(b) provided on the electric locomotive to protect the electrical equipment against excessive overloads automatically.
(c) provided with a handle to trip it when it is moved to the OFF position by hand.
(d) all of the above.


110. The characteristics of OHE depend on

(a) loss of contact and its duration.
(b) temperature and wear of contact wire.
(c) quality of current collection and pantograph pressure on contact wire.
(d) height, stagger, push up of an gradient of contact wire.
(e) all of the above.


111. Insulated overlaps are employed in electric traction to provide

(a) protection of transmission equipment in electric locomotives.
(b) isolating facilities required for the maintenance and operation of OHE.
(c) protection of signals in EMU trains.
(d) gap between adjacent terminal sections of railways.


112. Neutral sections are provided in single-phase ac traction as

(a) to protect the system from lightning strokes.
(b) supply cannot be maintained from adjacent substations at reduced voltage drops.
(c) adjacent substations tap different phases of three-phase system to achieve balancing.
(d) to provide return section for the communication purpose.


113. Use of booster transformers is restricted to urban areas because

(a) there are no earth and water currents.
(b) they are subjected to densely populated areas and so need protection.
(c) they complicate the OHE and cause more faults in the system and thus reduce the system reliability.
(d) they increase the impedance and need feeding posts to be located at close intervals.
(e) both (c) and (d).
(f) all of the above.


114. Negative booster

(a) is a separately-excited generator whose armature is connected to negative busbar and far end of the track through negative feeder.
(b) creates low voltage level in the track to allow all currents to flow through it.
(c) provides protection against earth fault currents.
(d) causes additional voltage drop necessary smooth operation.
(e) both (a) and (b).


115. In long distance electric trains power for lighting in passenger coaches is provided

(a) through rails.
(b) through locomotive.
(c) through individual generator of bogie and batteries.
(d) directly from overhead electric lines.


116. Power requirements of a train lighting and air-conditioning is met by

(a) servo generators.
(b) chargeable batteries in each compartment.
(c) axle driven generators in conjunction with batteries.
(d) either of (b) or (c).


118. Coach air-conditioning equipment includes

(a) standard refrigeration equipment.
(b) mechanical power generating equipment.
(c) electrical equipment for control with accessories.
(d) an air-conditioner with its standard accessories.
(e) all of the above except (d).


119. Requirement(s) of a railway coach air-conditioning is/are

(a) to provide heating/cooling.
(b) to supply clean, fresh air at a controlled uniform temperature.
(c) sufficient power requirement.
(d) to account for charging passenger traffic.
(e) all of the above.


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