MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
If the induction motor connected to a power grid draws real power P and reactive power Q. If it is made to run as a generator, then P and Q will be? |
| A. | negative, positive |
| B. | positive, positive |
| C. | positive, negative |
| D. | negative, negative |
| Answer» B. positive, positive | |
| 2. |
As per the condition given, if a 3-phase squirrel-cage induction motor is operating at a slip of -0.05 then machine will? |
| A. | draw mechanical strength and deliver electrical power to mains |
| B. | draw electrical power from mains and deliver mechanical strength to shaft |
| C. | draw electrical power from shaft and deliver mechanical strength through mains |
| D. | any of the mentioned |
| Answer» B. draw electrical power from mains and deliver mechanical strength to shaft | |
| 3. |
A 3-phase, 400 V, 50 Hz delta connected induction motor has power factor of 0.35 when delivering 30% of its load. If it is star connected, then its? |
| A. | p.f. increased and the stator current decreases |
| B. | p.f. worsened and the stator current decreases |
| C. | p.f. increased,and the stator current increases |
| D. | p.f. does not change,and the stator current increase |
| Answer» B. p.f. worsened and the stator current decreases | |
| 4. |
Static capacitors are used to control power factor of slip ring induction motor only. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
In double cage induction motor, inner cage has ___________ |
| A. | small resistance and large reactance |
| B. | high resistance and high reactance |
| C. | small resistance and small reactance |
| D. | high resistance and small reactance |
| Answer» B. high resistance and high reactance | |
| 6. |
Induction motor can be fed from ___________ |
| A. | either rotor or stator |
| B. | stator |
| C. | rotor |
| D. | neither stator nor rotor |
| Answer» B. stator | |
| 7. |
If one of the three phases of the induction motor fails due to fault. The motor will ___________ |
| A. | stop and do permanent damage if it was running overloaded |
| B. | continue running but will draw more current if it was operating at rated load |
| C. | will not be affect the operation if light loaded |
| D. | any of the mentioned |
| Answer» E. | |
| 8. |
If an unbalanced supply is fed to an induction motor, it will cause excessive heating of ____________ |
| A. | rotor |
| B. | stator |
| C. | rotor shaft |
| D. | all of the mentioned |
| Answer» B. stator | |