MCQOPTIONS
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MCQOPTIONS
This section includes 113 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
An ideal transformer will have maximum efficiency at a load such that? |
| A. | copper loss = iron loss |
| B. | copper loss iron loss |
| C. | none of the above |
| Answer» B. copper loss iron loss | |
| 102. |
An ideal transformer is one which has_____________? |
| A. | no losses and magnetic leakage |
| B. | interleaved primary and secondary windings |
| C. | a common core for its primary and secondary windings |
| D. | core of stainless steel and winding of pure copper metal |
| E. | none of the above |
| Answer» B. interleaved primary and secondary windings | |
| 103. |
An ideal transformer has infinite values of primary and secondary inductances. The statement is______________? |
| A. | true |
| B. | false |
| Answer» C. | |
| 104. |
A transformer transforms__________________? |
| A. | voltage |
| B. | current |
| C. | power |
| D. | frequency |
| Answer» D. frequency | |
| 105. |
A transformer oil must be free from________________? |
| A. | sludge |
| B. | odour |
| C. | gases |
| D. | moisture |
| Answer» E. | |
| 106. |
A Transformer transforms____________? |
| A. | voltage |
| B. | current |
| C. | current and voltage |
| D. | power |
| Answer» E. | |
| 107. |
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 |
| Answer» D. none of the above | |
| 108. |
A transformer core is laminated to__________? |
| A. | reduce hysteresis loss |
| B. | reduce eddy current losses |
| C. | reduce copper losses |
| D. | reduce all above losses |
| Answer» C. reduce copper losses | |
| 109. |
A transformer can have regulation closer to zero___________? |
| A. | on full-load |
| B. | on overload |
| C. | on leading power factor |
| D. | on zero power factor |
| Answer» D. on zero power factor | |
| 110. |
A transformer can have zero voltage regulation at______________? |
| A. | leading power factor |
| B. | lagging power factor |
| C. | unity power factor |
| D. | zero power factor |
| Answer» B. lagging power factor | |
| 111. |
A shell-type transformer has_________? |
| A. | high eddy current losses |
| B. | reduced magnetic leakage |
| C. | negligibly hysteresis losses |
| D. | none of the above |
| Answer» C. negligibly hysteresis losses | |
| 112. |
A no-load test is performed on a transformer to determine_______________? |
| A. | core loss |
| B. | copper loss |
| C. | efficiency |
| D. | magnetising current |
| E. | magnetising current and loss |
| Answer» F. | |
| 113. |
A good voltage regulation of a transformer means________________? |
| A. | output voltage fluctuation from no load to full load is least |
| B. | output voltage fluctuation with power factor is least |
| C. | difference between primary and secondary voltage is least |
| D. | difference between primary and secondary voltage is maximum |
| Answer» B. output voltage fluctuation with power factor is least | |