Reduction in core losses and increase in permeability are obtained with transformer employing__________?

Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?

A. Its secondary current is 5 A

B. Its secondary voltage is 400 V

C. Its rating is 2 kVA

D. Its secondary current is 20 A

E. It is a step-up transformer

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

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

A. friction and windage losses

B. magnetic losses

C. hysteresis and eddy current losses

D. copper losses

For given applied voltage, with the increase in frequency of the applied voltage?

A. eddy current loss will decrease

B. eddy current loss will increase

C. eddy current loss will remain unchanged

D. none of the above

In a power or distribution transformer about 10 per cent end turns are heavily insulated__________?

A. to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

B. to absorb the line surge voltage and save the winding of transformer from damage

C. to reflect the line surge and save the winding of a transformer from damage

D. none of the above