Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in____________?

A. short-circuiting of the secondaries
B. power factor of one of the transformers is leading while that of the other lagging
C. transformers having higher copper losses will have negligible core losses
D. loading of the transformers not in proportion to their kVA ratings

The noise produced by a transformer is termed as_______________________?

A. zoom
B. hum
C. ringing
D. buzz

If a transformer is switched on to a voltage more than the rated voltage______________?

A. its power factor will deteriorate
B. its power factor will increase
C. its power factor will remain unaffected
D. its power factor will be zero

Distribution transformers are generally designed for maximum efficiency around________________?

A. 90% load
B. zero load
C. 25% load
D. 50% load

The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?

A. magnetostrication
B. boo
C. hum
D. zoom

The chemical used in breather for transformer should have the quality of____________?

A. ionizing air
B. absorbing moisture
C. cleansing the transformer oil
D. cooling the transformer oil