During open circuit test of a transformer:

Related Mcqs:

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...

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

A. The power factor of the two trans-formers 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...

The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?

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

Open circuit test on transformers is conducted to determine____________?

A. hysteresis losses B. copper losses C. core losses D. eddy current losses...

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...