No-load current in a transformer________________?

A. lags behind the voltage by about 75°
B. leads the voltage by about 75°
C. lags behind the voltage by about 15°
D. leads the voltage by about 15°

The purpose of providing an iron core in a transformer is to_____________?

A. provide support to windings
B. reduce hysteresis loss
C. decrease the reluctance of the magnetic path
D. reduce eddy current losses

Which of the following is not a part of transformer installation ?

A. Conservator
B. Breather
C. Buchholz relay
D. Exciter

While conducting short-circuit test on a transformer the following side is short circuited?

A. High voltage side
B. Low voltage side
C. Primary side
D. Secondary side

In the transformer following winding has got more cross-sectional area______________?

A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding

A transformer transforms__________________?

A. voltage
B. current
C. power
D. frequency

A transformer cannot raise or lower the voltage of a D.C. supply because_______________?

A. there is no need to change the D.C. voltage
B. a D.C. circuit has more losses
C. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
D. none of the above

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 high voltage winding
D. none of the above

Which winding in a transformer has more number of turns ?

A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding

Efficiency of a power transformer is of the order of________________?

A. 100 per cent
B. 98 per cent
C. 50 per cent
D. 25 per cent