Electrical Machine - I (3140913) MCQs

MCQs of Transformers

Showing 151 to 155 out of 155 Questions
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151.
Breather is provided in a transformer to
(a) absorb moisture from air entering in the transformer as well as provide breathing to the transformer
(b) provide cold air in transformer
(c) absorb moisture from air entering in transformer
(d) filter the transformer oil
Answer:

Option (a)

152.
Normally for the design of the transformer, the ambient temperature is taken as
(a) 27o C
(b) 45o C
(c) 35o C
(d) 40o C
Answer:

Option (b)

153.
If the supply frequency of a transformer is 50Hz, its magnetostriction frequency would be
(a) 25 Hz
(b) 200 Hz
(c) 50 Hz
(d) 100 Hz
Answer:

Option (d)

154.
The noise of the transformer mainly due to
(a) magnetostriction in the iron core
(b) noise generated by cooling fans
(c) mechanical vibration of different parts of transformer
(d) all of the above
Answer:

Option (a)

155.
Winding conductors of an electrical power transformer are mainly insulated by
(a) Cotton Insulation
(b) Rubber Insulation
(c) Paper Insulation
(d) Wooden Insulation
Answer:

Option (c)

Showing 151 to 155 out of 155 Questions
11 12 13 14 15 16