Test: Single-Phase Transformers - 2 - Electrical Engineering (EE) MCQ

0.2 to 0.5 per cent

2 to 5 per cent

12 to 15 per cent

20 to 30 per cent

ionizing air

absorbing moisture

cleansing the transformer oil

cooling the transformer oil

to project against internal fault

to reduce copper as well as core losses

to cool the transformer oil

to take care of the expansion and contraction of transformer oil due to variation of temper-ature of sur-roundings

to provide oxygen inside the tank

to cool the coils during reduced load

to cool the transformer oil

to arrest flow of moisture when outside air enters the transformer

short-circuiting of the secondaries

power factor of one of the transformers is leading while that of the other lagging

transformers having higher copper losses will have negligible core losses

loading of the transformers not in proportion to their kVA ratings

average value

r.m.s. value

maximum value

instantaneous value

friction and windage losses

copper losses

hysteresis and eddy current losses

none of the above

Conservator

Breather

Bushings

Buchholz relay

load is unbalanced only

load is balanced only 

on balanced as well as unbalanced loads

none of the above

load is balanced only

load is unbalanced only

on balanced as well as unbalanced loads

none of the above