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CE- Transformer-MCQ

Total questions: 15

Worksheet time: 5mins

Name
Class
Date
1.

Which of the following does not change in a transformer...........

a)

Current

b)

Voltage

c)

Frequency

d)

All of the above

2.

In a transformer the energy is converted from primary to secondary..............

a)

Through the cooling coil

b)

Through air

c)

By the flux

d)

None of the above

3.

The path of a magnetic flux in a transformer should have.............

a)

High resistance

b)

High reluctance

c)

Low resistance

d)

Low reluctance

4.

The degree of mechanical vibrations produced by the lamination of a transformer depends on ..............

a)

Tightness of clamping

b)

Grade of laminations

c)

Size of laminations

d)

All of the above

5.

The no load current drawn by transformer is usually what percent of the full load current.........

a)

0.2 to 0.5 percent

b)

2 to 5 percent

c)

12 to 15 percent

d)

20 to 30 percent

6.

Which winding in a transformer has more no:of turns.............

a)

L.V winding

b)

H.V winding

c)

Primary winding

d)

secondory winding

7.

Efficiency of power transformer is of the order of ...........

a)

100%

b)

98%

c)

50%

d)

25%

8.

A common method of cooling a power transformer is ..............

a)

natural air cooling

b)

air blast cooling

c)

oil cooling

d)

any of the above

9.

Transformer breaths in when

a)

Load on it increases

b)

Load on it decreases

c)

Load remains constant

d)

None

10.

The purpose of providing iron core in a a stepup transformer is ..............

a)

To provide coupling between primary and secondary

b)

To increase the magnitude of mutual flux

c)

to decrease the magnitude of magnetizing current

d)

To provide all features

11.

Two transformer operating in parallel will share the load depending up on their........

a)

Leakage reactance

b)

per unit impedance

c)

Efficiency

d)

Ratings

12.

Spacers are provided between adjacent colis

a)

to provide free passage of cooling oil

b)

to insulate coils from each other

c)

Both a) and b)

d)

None of these

13.

The use of higher flux density in the transformer design...........

a)

Reduces weight per KVA

b)

Reduces iron losses

c)

Reduces copper losses

d)

Increases peak Load efficiency

14.

The chemical used in breather is ..............

a)

Asbestos fiber

b)

Silica sand

c)

Sodium chloride

d)

Silica gel

15.

Material used for construction od transformer core is usually

a)

Wood

b)

Copper

c)

aluminium

d)

Silicon steel