Losses which occur in rotating electric machines and do not occur in transformers are___________?

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...

A transformer oil must be free from________________?

A. sludge B. odour C. gases D. moisture...

Star/star transformers work satisfactorily when________________?

A. load is unbalanced only B. load is balanced only C. on balanced as well as unbalanced loads D. none of the above...

For the parallel operation of single phase transformers it is necessary that they should have___________?

A. same efficiency B. same polarity C. same kVA rating D. same number of turns on the secondary side....

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?

A. approximately equal to one B. less than one C. great than one D. none of the above...