MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the value of Crest factor if Vpeak=12 V and Vr.m.s=24 V. |
| A. | .2 |
| B. | .3 |
| C. | .4 |
| D. | .5 |
| Answer» E. | |
| 2. |
Calculate peak-peak voltage if Vmax=80 V and Vmin=20 V. |
| A. | 60 V |
| B. | 50 V |
| C. | 70 V |
| D. | 10 V |
| Answer» B. 50 V | |
| 3. |
Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 110° and supply frequency is 50 Hz. |
| A. | 3.8 msec |
| B. | 5.2 msec |
| C. | 9.3 msec |
| D. | 8.7 msec |
| Answer» B. 5.2 msec | |
| 4. |
Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 20° and supply frequency is 60 Hz. |
| A. | 8.8 msec |
| B. | 7.4 msec |
| C. | 10.1 msec |
| D. | 6.5 msec |
| Answer» D. 6.5 msec | |
| 5. |
In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 440 V and firing angle is 22°. |
| A. | 571.5 V |
| B. | 572.8 V |
| C. | 548.3 V |
| D. | 524.1 V |
| Answer» C. 548.3 V | |
| 6. |
Calculate the value of THD value for 3-Φ Fully controlled rectifier. |
| A. | 48.43 % |
| B. | 47.25 % |
| C. | 39.26 % |
| D. | 31 % |
| Answer» E. | |
| 7. |
Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 70°. |
| A. | .32 |
| B. | .38 |
| C. | .31 |
| D. | .33 |
| Answer» B. .38 | |
| 8. |
In 3-Φ Fully controlled rectifier calculate the average value of the voltage if the supply is 400 V and firing angle is 15°. |
| A. | 521.2 V |
| B. | 522 V |
| C. | 523 V |
| D. | 524 V |
| Answer» C. 523 V | |
| 9. |
Calculate the pulse number if the supply frequency is 2π and the output frequency is π÷3. |
| A. | 4 |
| B. | 2 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |