7000+ Single Phase Transformer Questions and Answers Pdf - 1

Question: 1

In an auto transformer, power is transferred through

(A) mutual coupling

(B) conduction process only

(C) induction process only

(D) both conduction and induction processes

Question: 2

In a power transformer

(A) low voltage winding is always wound with lesser number of turns of thicker wire

(B) high voltage winding is always wound with larger number of turns of thicker wire

(C) primary winding is always wound with many turns of thin wire

(D) secondary winding is always wound with lesser number of turns of thin wire

Question: 3

In a transformer supplying inductive load

(A) the secondary terminal voltage is less than the secondary induced emf

(B) the secondary current results in equivalent primary current in phase opposition

(C) the power factor on primary side will be lower than that of load

(D) all of the above

Question: 4

Transformer will operate at maximum efficiency when

(A) copper loss = iron loss

(B) hysteresis loss = eddy current loss

(C) eddy current loss = copper loss

(D) hysteresis loss = copper loss

Question: 5

In a transformer _____ decreases with the increase in leakage flux.

(A) primary induced emf

(B) secondary terminal voltage

(C) secondary induced emf

(D) none of the above