The transformer ratings are usually expressed in terms of______________?

If a transformer is continuously operated the maximum temperature rise will occur in_______________?

A. core
B. windings
C. tank
D. any of the above

For a transformer, operating at constant load current, maximum efficiency will occur at______________?

A. 0.8 leading power factor
B. 0.8 lagging power factor
C. zero power factor
D. unity power factor

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?

A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the above

The no-load current drawn by transformer is usually what per cent of the full-load current ?

A. 0.2 to 0.5 per cent
B. 2 to 5 per cent
C. 12 to 15 per cent
D. 20 to 30 per cent

During short circuit test iron losses are negligible because of _____________?

A. the current on secondary side is negligible
B. the voltage on secondary side does not vary
C. the voltage applied on primary side is low
D. full-load current is not supplied to the transformer

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

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