MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the output voltage of the Boost converter if the supply voltage is 1 V and duty cycle value is .9. |
| A. | 10 V |
| B. | 20 V |
| C. | 40 V |
| D. | 60 V |
| Answer» B. 20 V | |
| 2. |
Calculate the value of Crest factor if Vpeak=1.5 V and Vr.m.s=2.5 V. |
| A. | .4 |
| B. | .6 |
| C. | .5 |
| D. | .7 |
| Answer» C. .5 | |
| 3. |
____________ is the switching frequency of SITH. |
| A. | 55 KHz |
| B. | 100 KHz |
| C. | 91 KHz |
| D. | 105 KHz |
| Answer» C. 91 KHz | |
| 4. |
Device with highest d(i) d(t) and d(v) d(t) capability is _____________ |
| A. | GTO |
| B. | BJT |
| C. | SCR |
| D. | SITH |
| Answer» E. | |
| 5. |
What is the formula for thermal voltage? |
| A. | K e T |
| B. | K T e |
| C. | K<sup>2</sup> e T |
| D. | K e<sup>2</sup> T |
| Answer» B. K T e | |
| 6. |
SCR is unipolar. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The most reliable method for thyristor triggering is thermal triggering. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
25 V rated n SCRs are connected in series. The operation voltage of the string is 300 V and the string efficiency is 40 %. Calculate the value of n. |
| A. | 27 |
| B. | 30 |
| C. | 34 |
| D. | 36 |
| Answer» C. 34 | |
| 9. |
Calculate the string efficiency if the de-rating factor is .22. |
| A. | 78 % |
| B. | 42 % |
| C. | 20 % |
| D. | 90 % |
| Answer» B. 42 % | |
| 10. |
Calculate the De-rating factor if the string efficiency is 90 %. |
| A. | .4 |
| B. | .1 |
| C. | .7 |
| D. | .8 |
| Answer» B. .1 | |
| 11. |
A step-down chopper has input voltage 12 V and output voltage 2 V. Calculate the value of the duty cycle. |
| A. | 0.26 |
| B. | 0.16 |
| C. | 0.33 |
| D. | 0.41 |
| Answer» C. 0.33 | |
| 12. |
High d(v) d(t) causes _______________ |
| A. | Local hotspots |
| B. | False triggering |
| C. | High cost |
| D. | High-speed operation |
| Answer» C. High cost | |
| 13. |
Calculate the value of output r.m.s voltage for Single phase Full-bridge inverter if the DC supply is 25 V. |
| A. | 26 V |
| B. | 25 V |
| C. | 27 V |
| D. | 28 V |
| Answer» C. 27 V | |
| 14. |
High d(i) d(t) causes _______________ |
| A. | Local hotspots |
| B. | Breakdown |
| C. | High cost |
| D. | Low cost |
| Answer» B. Breakdown | |
| 15. |
Calculate the value of output r.m.s voltage for Single phase Half-bridge inverter if the DC supply is 80 V. |
| A. | 40 V |
| B. | 20 V |
| C. | 10 V |
| D. | 60 V |
| Answer» B. 20 V | |