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Quiz transformer3

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

The transformer core is made of _____ material.

a)

Copper

b)

Plastic

c)

Ferromagnetic steel

d)

Aluminium

2.

Which of the following is a magnetic loss?

a)

Eddy current

b)

Copper

c)

Load

d)

Mechanical

3.

A transformer works only on _____ current.

a)

Direct

b)

Alternating

c)

Pulsating DC

d)

Static

4.

In an ideal transformer, all the flux links both windings.

a)

True

b)

False

5.

If a transformer has 500 turns on primary and 50 on secondary, it is a _____ transformer.

a)

Step-up

b)

Step-down

c)

Isolation

d)

Three-phase

6.

The current in the secondary depends on _____.

a)

Voltage ratio

b)

Load connected

c)

Power factor only

d)

Frequency only

7.

The open-circuit test is performed on the _____ winding.

a)

High-voltage

b)

Low-voltage

c)

Either side

d)

Secondary only

8.

Voltage regulation occurs because of _____.

a)

Internal impedance

b)

Frequency variation

c)

Temperature

d)

Core thickness

9.

The efficiency of a good transformer is usually _____.

a)

20–30%

b)

40–60%

c)

80–90%

d)

Above 95%

10.

When load current increases, the secondary voltage usually _____.

a)

Increases

b)

Decreases

c)

Constant

d)

Zero