MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
Third lowest order harmonic present in 3- fully controlled rectifier is __________ |
| A. | 11<sup>th</sup> |
| B. | 17<sup>th</sup> |
| C. | 13<sup>th</sup> |
| D. | 22<sup>nd</sup> |
| Answer» B. 17<sup>th</sup> | |
| 2. |
Calculate peak-peak voltage if Vmax=200 V and Vmin=190 V. |
| A. | 20 V |
| B. | 10 V |
| C. | 60 V |
| D. | 80 V |
| Answer» C. 60 V | |
| 3. |
Thyristors are used in parallel to complete ________ |
| A. | High voltage demand |
| B. | High current demand |
| C. | Low current demand |
| D. | Low voltage demand |
| Answer» D. Low voltage demand | |
| 4. |
Thyristors are used in series to complete ________ |
| A. | High voltage demand |
| B. | High current demand |
| C. | Low voltage demand |
| D. | Low current demand |
| Answer» D. Low current demand | |
| 5. |
The range of On-State voltage drop is _______ |
| A. | 1-1.6 V |
| B. | 0-1 V |
| C. | 1.6-2 V |
| D. | 2.4-3 V |
| Answer» B. 0-1 V | |
| 6. |
The range of turn-off time is _______ |
| A. | .51-3 sec |
| B. | 3-101 sec |
| C. | 9-400 sec |
| D. | 7-787 sec |
| Answer» C. 9-400 sec | |
| 7. |
Gate triggering is more reliable. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
100 V rated 3 SCRs are connected in series. The operation voltage of the string is 200. Calculate the De-rating factor. |
| A. | .35 |
| B. | .33 |
| C. | .38 |
| D. | .18 |
| Answer» C. .38 | |
| 9. |
400 V rated 5 SCRs are connected in series. The operation voltage of the string is 500. Calculate the string efficiency. |
| A. | 25 % |
| B. | 40 % |
| C. | 38 % |
| D. | 35 % |
| Answer» B. 40 % | |
| 10. |
Calculate the string efficiency if the de-rating factor is .48. |
| A. | 48 % |
| B. | 52 % |
| C. | 50 % |
| D. | 60 % |
| Answer» C. 50 % | |
| 11. |
Calculate the De-rating factor if the string efficiency is 20 %. |
| A. | .8 |
| B. | .4 |
| C. | .5 |
| D. | .6 |
| Answer» B. .4 | |
| 12. |
A step-down chopper has input voltage 40 V and output voltage 20 V. Calculate the value of the duty cycle. |
| A. | 0.5 |
| B. | 0.2 |
| C. | 0.3 |
| D. | 0.4 |
| Answer» B. 0.2 | |
| 13. |
R-L-C overdamped loads are generally lagging power factor loads. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
Which one of the following load is suitable for load commutation in Single phase Half-bridge inverter? |
| A. | R-L load |
| B. | R-L-C overdamped |
| C. | R-L-C underdamped |
| D. | L-load |
| Answer» D. L-load | |