Distribution transformers are generally designed for maximum efficiency around________________?

Which winding in a transformer has more number of turns ?

A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding

Minimum voltage regulation occurs when the power factor of the load is_____________?

A. unity
B. lagging
C. leading
D. zero

Which winding of the transformer has less cross-sectional area?

A. Primary winding
B. Secondary winding
C. Low voltage winding
D. High voltage winding

Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?

A. Bmax
B. Bmax1-6
C. Bmax1-83
D. B max

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 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