1000+ Transformers Quiz Questions and Answers - 2

Question: 6

Losses which occur in rotating electric machines and do not occur in transformers are

(A) copper losses

(B) hysteresis and eddy current losses

(C) magnetic losses

(D) friction and windage losses

Question: 7

A transformer core is laminated to

(A) reduce all above losses

(B) reduce copper losses

(C) reduce eddy current losses

(D) reduce hysteresis loss

Question: 8

A transformer is used to change the value of

(A) voltage

(B) frequency

(C) power

(D) power factor

Question: 9

In a transformer the magnitude of mutual flux

(A) is high at low loads and low at high loads

(B) is low at low loads and high at high loads

(C) same at all loads

(D) varies at low loads and constant at high loads

Question: 10

Transformer cores are built up from laminations rather than from solid metal so that

(A) eddy current loss is reduced

(B) turn ratio is higher than voltage ratio

(C) oil penetrates the core more easily

(D) less insulation is required for the windings