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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. |
Choose the correct representation for the time phasor below. |
A. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q6.png"><img alt="The correct representation for the time phasor below - option a" class="alignnone size-full wp-image-160906" height="197" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q6.png" width="300"/></a> |
B. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q12b.png"><img alt="The correct representation for the time phasor below - option b" class="alignnone size-full wp-image-160908" height="167" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q12b.png" width="288"/></a> |
C. | <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q12c.png"><img alt="The correct representation for the time phasor below - option c" class="alignnone size-full wp-image-160909" height="194" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-quiz-q12c.png" width="119"/></a> |
D. | all of the mentioned |
Answer» E. | |
2. |
Potier method is very accurate due to __________ |
A. | emfs are handled as voltage and mmf as AT |
B. | emf and mmf are handled as AT |
C. | emf and mmf are handled as voltage |
D. | none of the mentioned |
Answer» B. emf and mmf are handled as AT | |
3. |
The leakage reactance can be determined with lesser accuracy by using Potier triangle. |
A. | True |
B. | False |
Answer» C. | |
4. |
The short circuit characteristic of alternator is a straight line due to __________ |
A. | no saturation |
B. | no armature reaction |
C. | no eddy current |
D. | all of the mentioned |
Answer» B. no armature reaction | |
5. |
The load angle is between __________ |
A. | Ef and Ia |
B. | Ia and field flux |
C. | Ef and Vt |
D. | Vt and Ia |
Answer» D. Vt and Ia | |
6. |
The internal power factor angle is between __________ |
A. | Ef and Ia |
B. | Ia and field flux |
C. | Ef and Vt |
D. | Vt and Ia |
Answer» B. Ia and field flux | |
7. |
If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________ |
A. | hysteresis effect |
B. | armature reaction |
C. | hysteresis effect and armature reaction |
D. | eddy currents |
Answer» B. armature reaction | |