MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Dc Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which converter/s can be used for DC series motor control? |
| A. | Semi-converters |
| B. | Half-wave converter |
| C. | Full-converter |
| D. | Semi converters and full converter |
| Answer» E. | |
| 2. |
Dual converter operates in _________________ |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 3. |
Full-converter can be used in DC motor for regenerative braking in ______________ |
| A. | Constant operation |
| B. | Variable operation |
| C. | Inversion operation |
| D. | Opposite operation |
| Answer» D. Opposite operation | |
| 4. |
How many thyristors does we need in semi-converter? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | Many |
| Answer» C. 3 | |
| 5. |
How many thyristors does we need in half wave converter?a) 1b) 2c) 3d) Many 3.Semi-converters can’t be used when regeneration is required. |
| A. | 1b) 2c) 3d) Many 3.Semi-converters can’t be used when regeneration is required.a) True |
| B. | 2 |
| C. | 3 |
| D. | Many 3.Semi-converters can’t be used when regeneration is required.a) Trueb) FalseView Answer |
| Answer» B. 2 | |
| 6. |
FULL-CONVERTER_CAN_BE_USED_IN_DC_MOTOR_FOR_REGENERATIVE_BRAKING_IN_______________?$ |
| A. | Constant operation |
| B. | Variable operation |
| C. | Inversion operation |
| D. | Opposite operation |
| Answer» D. Opposite operation | |
| 7. |
Which converter/s can be used for DC series motor control?$ |
| A. | Semi-converters |
| B. | Half-wave converter |
| C. | Full-converter |
| D. | Semi converters and full converter |
| Answer» E. | |
| 8. |
Dual_converter_operates_in__________________$ |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 9. |
Three phase converters are employed for _______________ |
| A. | Large kW motors |
| B. | Small kW motors |
| C. | In all motors |
| D. | Never used |
| Answer» B. Small kW motors | |
| 10. |
How many thyristors are required for full converter? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 11. |
How many quadrants does full-converter work? |
| A. | One |
| B. | Half |
| C. | Two |
| D. | Can be any |
| Answer» D. Can be any | |
| 12. |
Which of the following is the effect of non-uniform armature current? |
| A. | Ratio of peak to average and rms to average armature current decreases |
| B. | Ratio of peak to average and rms to average armature current increases |
| C. | Ratio of peak to average increases and rms to average armature current decreases |
| D. | Ratio of peak to average decreases and rms to average armature current increases |
| Answer» C. Ratio of peak to average increases and rms to average armature current decreases | |
| 13. |
When armature current becomes discontinuous? |
| A. | Small firing angles |
| B. | Large firing angles |
| C. | Infinite firing angle |
| D. | Does not depend on firing angle |
| Answer» C. Infinite firing angle | |
| 14. |
Semi-converters can’t be used when regeneration is required.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
How many thyristors does we need in half wave converter? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | Many |
| Answer» B. 2 | |
| 16. |
Half wave converters are used for controlling DC motor of ________________ |
| A. | Below 400 W |
| B. | 400 W – 4000W |
| C. | More than 4000W |
| D. | Anywhere |
| Answer» B. 400 W ‚Äö√Ñ√∂‚àö√ë‚àö¬® 4000W | |