1000+ Transformer Multiple Choice Questions and Answers Pdf - 2

Question: 6

Which of the following insulating materials can withstand the highest temperature safely?

(A) glass fibre

(B) mica

(C) asbestos

(D) cellulose

Question: 7

A transformer can have zero voltage regulations at

(A) zero power factor

(B) unity power factor

(C) lagging power factor

(D) leading power factor

Question: 8

Which of the following properties is not necessarily desirable for the material for transformer core?

(A) adequate mechanical strength

(B) high thermal conductivity

(C) high permeability

(D) low hysteresis loss

Question: 9

The purpose of providing iron core in a step up transformer is

(A) to prevent all above features

(B) to decrease the magnitude of magnetizing current

(C) to increase the magnitude of mutual flux

(D) to provide coupling between primary and secondary

Question: 10

In a transformer the energy is conveyed from primary to secondary

(A) by the flux

(B) through air

(C) through cooling coil

(D) none of the above