MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 257 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
A single-phase one-pulse diode rectifier is feeding an RL load with freewheeling diode across the load. For conduction angle , the main diode and freewheeling diode would, respectively, conduct for |
| A. | , |
| B. | , |
| C. | , |
| D. | , |
| Answer» C. , | |
| 252. |
In Fig. PIV required for the diode is |
| A. | 300 V |
| B. | 100 V |
| C. | 200 V |
| D. | 400 V |
| Answer» E. | |
| 253. |
In Fig. zero centre and ideal PMMC voltmeters M |
| A. | 10 V, 10 V |
| B. | 0, 10 V |
| C. | 10 V, 7 07 V |
| D. | 10 V, 7 07 V |
| Answer» B. 0, 10 V | |
| 254. |
In Fig. an ideal moving iron voltmeter M will read |
| A. | 7 07 V |
| B. | 12 25 V |
| C. | 14 14 V |
| D. | 20 0 V |
| Answer» C. 14 14 V | |
| 255. |
If the commutation angle of a Diode rectifier (due to source inductance effect) is . Then the inductive voltage regulation will be |
| A. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1 + cos </center></td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| B. | <table><tr><td rowspan="2">1 +</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>cos </center></td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| C. | <table><tr><td rowspan="2">1 -</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>cos </center></td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| D. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1 - cos </center></td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| Answer» E. | |
| 256. |
A single-phase ac voltage controller (or regulator) fed from 50 Hz system supplies a load having resistance and inductance of 2 0 and 6 36 mH respectively. The control range of firing angle for this regulator is |
| A. | 0 < < 180 |
| B. | 45 < < 180 |
| C. | 90 < < 180 |
| D. | 0 < < 45 |
| Answer» C. 90 < < 180 | |
| 257. |
A single-phase voltage controller, using two SCRs in antiparallel, is found to be operating as a controlled rectifier. This is because |
| A. | load is R and pulse gating is used |
| B. | load is R and high-frequency carrier gating is used |
| C. | load is RL and pulse gating is used |
| D. | load is RL and continuous gating is used |
| Answer» D. load is RL and continuous gating is used | |