Free Printable CAT2_traction and drives

1.

1. The main function of an electric drive is.................................

a)

Generate electricity

b)

Convert electrical energy into mechanical energy

c)

Store energy

d)

Transmit signals

2.

For high starting torque applications, the motor preferred is........................................

a)

SRM Motors

b)

stepper motor

c)

dc shunt motor

d)

dc series motor

3.

Which of the following is a disadvantage of group drive?

a)

Higher efficiency

b)

Independent speed control

c)

Breakdown of one motor affects all machines

d)

Reduced cost

4.

The term “plugging” in drives means.....................................?

a)

Switching off the motor

b)

Reversing supply polarity for braking

c)

Reducing motor speed gradually

d)

Starting with reduced voltage

5.

The main advantage of DC series motor in traction is..............................?

a)

High efficiency

b)

Uniform torque

c)

High starting torque

d)

Low cost

6.

The device used to collect current from overhead wire is..............................?

a)

a) Transformer

b)

b) Collector gear

c)

c) Pantograph

d)

d) Relay

7.

Which ensures proper mechanical strength of overhead line ?

a)

Contact wire

b)

Catenary

c)

Dropper

d)

Pantograph

8.

The height of overhead wire in Indian Railways is approx.........................

a)

3 m

b)

4.5–5.5 m

c)

10 m

d)

15 m

9.

. The speed-time curve is used to determine.............................

a)

Average speed

b)

Acceleration

c)

Energy consumption

d)

All of these

10.

For suburban services, the speed-time curve is approximated to..........................

a)

Rectangular

b)

Triangular

c)

Quadrilateral

d)

None

11.

Acceleration during starting of train is limited by...........................

a)

Adhesion

b)

Torque

c)

Voltage

d)

Speed

12.

The method used for starting traction motor is:

a)

Direct on line

b)

Series-parallel starting

c)

Star-delta

d)

None

13.

In series-parallel starting, motors are initially connected in.....................

a)

Parallel

b)

Series

c)

Star

d)

Delta

14.

booster transformers are used in traction system to........

a)

step up voltage

b)

reduce voltage drop

c)

reduce EMI by Earth return current

d)

safety

15.

a traction system having crest speed 120kmph, for attaining crest speed from 40kmph in 8 sec what is the acceleration must apply

a)

10kmph/s

b)

14 m/s2

c)

11kmph/s

d)

12kmph/s

16.

usually mainline services distance ranging from

a)

0 to 5km

b)

0 to 1km

c)

< 1km

d)

10km <

17.

dynamic braking in 3Phase Induction motor is achieved by

a)

switching off the supply

b)

reversing any two phases

c)

injecting DC for longer duration

d)

injecting DC for shorter duration

18.

Energy efficiency of series parallel transition is

a)

80.11%

b)

76.66%

c)

66.66%

d)

33.33%

19.

MAGLEV (magnetic levitation)trains operate using

a)

SR Motor

b)

synchronous motor

c)

AC series motor

d)

3 Phase Linear Induction motor

20.

The speed of MAGLEV trains can go up to....................

a)

120kmph

b)

350kmph

c)

600kmph

d)

1200kmph

CAT2_traction and drives

Total questions: 20

Worksheet time: 7mins

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