MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
No load test has been conducted on an induction motor for different supply voltages and input power vs voltage plot has been drawn. The curve is extrapolated to intersect the y-axis. This point is? |
| A. | friction and windage losses |
| B. | core losses |
| C. | stray losses |
| D. | all of the mentioned |
| Answer» B. core losses | |
| 2. |
A 3-phase induction motor taking a line current of 200 A, is started by direct switching. If an auto transformer of with 50% tapping is made to be used, the motor line current and supply line current will be respectively? |
| A. | 100, 50 |
| B. | 50, 100 |
| C. | 50, 200 |
| D. | 50*1.73, 200 |
| Answer» B. 50, 100 | |
| 3. |
When the poles of a 3-phase wound rotor induction motor increased, it _________ |
| A. | will decrease maximum power factor |
| B. | will increase maximum power factor |
| C. | will make no change in power factor |
| D. | can not be depicted |
| Answer» C. will make no change in power factor | |
| 4. |
Reducing the poles of a 3-phase induction motor, it _________ |
| A. | will decrease maximum power factor |
| B. | will increase maximum power factor |
| C. | will make no change in power factor |
| D. | can not be depicted |
| Answer» B. will increase maximum power factor | |
| 5. |
We can not operate a cage induction motor on a variable frequency load due to ___________ |
| A. | no availability of varying the speed |
| B. | availability of variable speed |
| C. | low starting torque |
| D. | fixed slip |
| Answer» B. availability of variable speed | |
| 6. |
Relatively a squirrel-cage induction motor is advantageous over wound rotor type induction motor of identical rating due to ___________ |
| A. | less conductor material used. |
| B. | lower leakage flux |
| C. | ruggedness |
| D. | all of the mentioned |
| Answer» E. | |
| 7. |
Wound rotor induction motor is most appropriate for the applications requiring ______________ |
| A. | high starting torque |
| B. | variable starting torque |
| C. | fixed starting torque |
| D. | all of the mentioned |
| Answer» C. fixed starting torque | |