Basic Electrical Engineering (3110005) MCQs

MCQs of Transformers

Showing 21 to 30 out of 31 Questions
1 2 3 4
21.
Transfer of electric power from primary to secondary in a transformer takes place
(a) electrically
(b) magnetically
(c) electro-magnetically
(d) conductively
Answer:

Option (c)

22.
Buchholz relay is
(a) voltage sensitive device
(b) current sensitive device
(c) frequency sensitive device
(d) gas actuated device
Answer:

Option (d)

23.
A transformer transforms
(a) Voltage
(b) Current
(c) Power
(d) Frequency
Answer:

Option (c)

24.
Which of the following does not change in a transformer?
(a) Current
(b) Voltage
(c) Frequency
(d) All of above
Answer:

Option (c)

25.
In a transformer the energy is conveyed from primary to secondary
(a) Through cooling coils
(b) Through air
(c) By the flux
(d) None of the above
Answer:

Option (c)

26.
Primary winding of a transformer
(a) Is always a low voltage winding
(b) Is always a high voltage winding
(c) Could either be a low voltage or a high voltage winding
(d) None of the above
Answer:

Option (c)

27.
Which winding in a transforemer has more number of turns?
(a) Low voltage winding
(b) High voltage winding
(c) Primary winding
(d) Secondary winding
Answer:

Option (b)

28.
Efficiency of a power transformer is of the order of
(a) 100%
(b) 98%
(c) 50%
(d) 25%
Answer:

Option (b)

29.
The transformer ratings are usually expressed in terms of
(a) Volts
(b) Amperes
(c) kW
(d) kVA
Answer:

Option (d)

30.
The path of the magnetic flux in transformer should have
(a) High reluctance
(b) Low reluctance
(c) High resistance
(d) Low resistance
Answer:

Option (b)

Showing 21 to 30 out of 31 Questions
1 2 3 4