Transformers MCQ Questions Answers Electrical Engineering

Transformers Electrical Engineering MCQ Questions Answers


1) A transformer will work on……….

a) a.c only

b) d.c only

c) a.c as well as d.c

d) none of the above

View Answer
Option – a)

2) A transformer does not posses ……..changing property.

a) impedance

b) voltage

c) current

d) power

View Answer
Option – d)

3) An ideal transformer is one which ……….

a) has no losses and leakage reactance

b) does not work

c) has same number of primary and secondary turns

d) none of the above

View Answer
Option – a)

4) The primary leakage flux links ………

a) primary winding only

b) secondary winding only

c) both primary and secondary windings

d) none of the above

View Answer
Option – a)

5) The amount of copper in the primary is ……. That of secondary.

a) about the same as

b) greater than

c) smaller than

d) none of the above

View Answer
Option – a)

6) When load on a transformer is increased, the eddy current ……….

a) is increased

b) remains unchanged

c) is decreased

d) none of the above

View Answer
Option – b)

7) The approximate efficiency of a large transformer is ………

a) 65%

b) 50%

c) 80%

d) 95%

View Answer
Option – d)

8) A transformer has 200 W as iron loss at full-load. The iron loss at half full-load will be …….

a) 50 W

b) 100 W

c) 400 W

d) 200 W

View Answer
Option – d)

9) Transformers having rating less than 5 k VA  are generally……..

a) oil cooled

b) natural cooled

c) water cooled

d) none of the above

View Answer
Option – b)

10) The secondary load impedance of a step-up transformer is Zs the primary impedance Zp will be

a) equal to Zs

b) greater than Zs

c) less than Zs

d) none of the above

View Answer
Option – c)

11) The power efficiency of a lighting transformer is always……..its all-day efficiency.

a) equal to

b) higher than

c) less than

d) none of the above

View Answer
Option – b)

12) What is the approximate efficiency of large transformers?

a) 65%

b) 75%

c) 85%

d) 95%

View Answer
Option – d)

13) The inductive reactance of a transformer depends on

a) e.m.f.

b) m.m.f.

c) leakage flux

d) magnetic flux

View Answer
Option – c)

14) How are transformers generally cooled for installations rated at less than 5 kVA?

a) oil cooled

b) air cooled

c) water cooled

d) none of the above

View Answer
Option – b)

15) The transformer that does not provide electric isolation is

a) power transformer

b) autotransformer

c) current transformer

d) potential transformer

View Answer
Option – b)
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