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. |
I. An induction can never operate at leading power factor. II. Speed of the induction motor can be made more than synchronous speed and still it will work as motor. |
| A. | I is true, II is false |
| B. | I is true, II is true |
| C. | I is false, II is true |
| D. | I is false, II is also false |
| Answer» B. I is true, II is true | |
| 2. |
Number of the slip rings required for the satisfied operation of an induction motor is? |
| A. | number of phases |
| B. | number of poles |
| C. | halve of number of poles |
| D. | double the phases |
| Answer» B. number of poles | |
| 3. |
If the squirrel-cage induction motor is replaced by a solid cylinder in an induction motor its slip will ____________ |
| A. | increase |
| B. | decrease |
| C. | be same |
| D. | zero |
| Answer» B. decrease | |
| 4. |
The speed characteristic of the induction motor is analogous to ____________ |
| A. | dc shunt motor |
| B. | synchronous motor |
| C. | cumulative compound motor |
| D. | stepper motor |
| Answer» B. synchronous motor | |
| 5. |
The external rotor resistance is ____________ |
| A. | gradually cut out as motor picks up the speed |
| B. | fixed for a stable point |
| C. | removed instantalLy as the motor is started |
| D. | added or reduced as per the efficiency requirement |
| Answer» B. fixed for a stable point | |
| 6. |
While conducting the tests on the 3-phase induction motor, the variation of rotational losses with respect to voltage can be obtained as? |
| A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4a.png"><img alt="The variation of rotational losses to voltage - option a" class="alignnone size-full wp-image-161082" height="168" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4a.png" width="300"/></a> |
| B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4b.png"><img alt="The variation of rotational losses to voltage - option b" class="alignnone size-full wp-image-161083" height="166" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4b.png" width="300"/></a> |
| C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4c.png"><img alt="The variation of rotational losses to voltage - option c" class="alignnone size-full wp-image-161084" height="173" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4c.png" width="300"/></a> |
| D. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4d.png"><img alt="The variation of rotational losses to voltage - option d" class="alignnone size-full wp-image-161085" height="185" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4d.png" width="300"/></a> |
| Answer» B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4b.png"><img alt="The variation of rotational losses to voltage - option b" class="alignnone size-full wp-image-161083" height="166" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-aptitude-test-q4b.png" width="300"/></a> | |
| 7. |
Blocked rotor test comprises of ____________ |
| A. | rotor and stator copper losses. |
| B. | rotor copper and stator core losses. |
| C. | rotor core losses |
| D. | stator copper losses |
| Answer» B. rotor copper and stator core losses. | |