MCQOPTIONS
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MCQOPTIONS
This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A motor generator set used for providing variable frequency AC supply consist of a three-phase, 10-pole synchronous motor and a 24-pole, three-phase synchronous generator. The motor-generator set is fed from a 25 Hz, three-phase AC supply. Determine the frequency of the generated voltage of the synchronous generator. |
| A. | 40 Hz |
| B. | 50 Hz |
| C. | 25 Hz |
| D. | 60 Hz |
| Answer» E. | |
| 2. |
In a four-quadrant operation of an electric machine, the third quadrant operation is: |
| A. | forward motoring |
| B. | reverse braking |
| C. | forward braking |
| D. | reverse motoring |
| Answer» E. | |
| 3. |
For a three-phase induction motor drive, which of the following technique is NOT used? |
| A. | Frequency control |
| B. | Stator voltage control |
| C. | Rotor voltage control |
| D. | Moisture control |
| Answer» E. | |
| 4. |
In the speed control of a slip ring induction motor using slip power recovery scheme ______. |
| A. | The efficiency increases but power factor decreases. |
| B. | Efficiency improves and power factor remains constant. |
| C. | Power factor improves but efficiency decreases. |
| D. | Both power factor and efficiency improve. |
| Answer» B. Efficiency improves and power factor remains constant. | |