Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by whitelisting our website.

Transformers

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?

Transformers /

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

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? Read More »

Transformers

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?

Transformers /

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

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________? Read More »

Transformers

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

Transformers /

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

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

Transformers

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

Transformers /

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

A. core built-up of laminations of cold rolled grain oriented steel
B. core built-up of laminations of hot rolled sheet
C. either of the above
D. none of the above

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

Transformers