The chemical used in breather for transformer should have the quality of

What will happen if the transformers working in parallel are not connected with regard to polarity?

A. The power factor of the two transformers will be different from the power factor of common load

B. Incorrect polarity will result in dead short circuit

C. The transformers will not share load in proportion to their kVA ratings

D. none of the above

Which of the following is not a routine test on transformers?

A. Core insulation voltage test

B. Impedance test

C. Radio interference test

D. Polarity test

A no-load test is performed on a transformer to determine

A. core loss

B. copper loss

C. efficiency

D. magnetising current

E. magnetising current and loss

Which of the following is the main advantage of an auto-transformer over a two winding transformer?

A. Hysteresis losses are reduced

B. Saving in winding material

C. Copper losses are negligible

D. Eddy losses are totally eliminated