MCQOPTIONS
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MCQOPTIONS
This section includes 5 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 three-phase half-wave controlled converter is fed from a 3-phase, 400 V source and is connected to a load which takes a constant current of 36 A. Find, the value of average output voltage and average current rating of SCR for a firing angle of 30 . |
| A. | 234 V, 36 A |
| B. | 234 V, 12 A |
| C. | 135 V, 36 A |
| D. | 135 V, 12 A |
| Answer» C. 135 V, 36 A | |
| 2. |
A three-phase M-3 converter is operated from a 3-phase, 230 V, 50 Hz supply with load resistance R = 10 . Find the value of firing angle if an average output voltage of 50% of the maximum possible output voltage is required.
|
| A. | 92.7 |
| B. | 67.7 |
| C. | 45 |
| D. | 75.7 |
| Answer» C. 45 | |
| 3. |
A three-phase three pulse type controlled converter is constructed using 3 SCR devices. The circuit is supplying an R load with < 30 . As such, each SCR device would conduct for |
| A. | 60 each cycle |
| B. | 120 each cycle |
| C. | 180 each cycle |
| D. | 360 each cycle |
| Answer» C. 180 each cycle | |
| 4. |
In a three-phase, three-pulse, M-3 type controlled converter T1 starts to conduct at 30 + n . At what angles do T2 and T3 start to conduct? Assume that the conduction sequence is T1-T2-T3. |
| A. | 2n and 3n |
| B. | 150 + n and 270 + n |
| C. | n each |
| D. | 30 + n and 60 + n |
| Answer» C. n each | |
| 5. |
A three-phase, three-pulse, M-3 type controlled converter has firing angle for one of the SCRs set as 15 . This SCR would start conducting at |
| A. | 0 |
| B. | 15 |
| C. | 30 |
| D. | 45 |
| Answer» E. | |