MCQOPTIONS
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MCQOPTIONS
This section includes 13 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 single-phase sinusoidal voltage controller has |
| A. | one primary and n secondary windings |
| B. | one primary and (n-1) secondary windings |
| C. | n primary and n secondary windings |
| D. | (n-1) primary and n secondary windings |
| Answer» C. n primary and n secondary windings | |
| 2. |
In a N-stage sequence controller, each secondary is rated for __________ |
| A. | n x Vs |
| B. | Vs |
| C. | Vs/n |
| D. | Vs x (n-1) |
| Answer» D. Vs x (n-1) | |
| 3. |
A single-phase two stage sequence controller is designed to work on 230 V supply, and upper and lower current ratings must be 20 A and 21 A respectively. Find the transformer rating. |
| A. | 230 VA |
| B. | 4600 VA |
| C. | 9430 VA |
| D. | 9200 VA |
| Answer» D. 9200 VA | |
| 4. |
For obtaining the output voltage control from V to 2V, the firing angle must be |
| A. | always 0 for T3, T4 |
| B. | always 180 for T3, T4 |
| C. | 0 to 180 from T3, T4 |
| D. | none of the mentioned |
| Answer» B. always 180 for T3, T4 | |
| 5. |
If T1, T2 are kept off and T3, T4 are having a firing angle of 180° each, then the output voltage is ____ if the turns ratio is 1:1 |
| A. | Vs |
| B. | √2Vs |
| C. | 0 |
| D. | 2Vs |
| Answer» D. 2Vs | |
| 6. |
The below given circuit is that of a |
| A. | four stage sequence controller |
| B. | two stage sequence controller |
| C. | full wave ac voltage controller |
| D. | none of the mentioned |
| Answer» C. full wave ac voltage controller | |
| 7. |
From the below given statements regarding sequence control of ac voltage, which of them are true?i) It improves system power factorii) It reduces the harmonic content at the outputiii) Wider control of output voltage is possible |
| A. | only (i) |
| B. | only (i) and (ii) |
| C. | only (i) and (iii) |
| D. | all of them are true |
| Answer» E. | |
| 8. |
A_SINGLE-PHASE_SINUSOIDAL_VOLTAGE_CONTROLLER_HAS?$ |
| A. | one primary and n secondary windings |
| B. | one primary and (n-1) secondary windings |
| C. | n primary and n secondary windings |
| D. | (n-1) primary and n secondary windings |
| Answer» C. n primary and n secondary windings | |
| 9. |
In a N-stage sequence controller, each secondary is rated for _________? |
| A. | n x Vs |
| B. | Vs |
| C. | Vs/n |
| D. | Vs x (n-1) |
| Answer» D. Vs x (n-1) | |
| 10. |
A single-phase two stage sequence controller is designed to work on 230 V supply, and upper and lower current ratings must be 20 A and 21 A respectively. Find the transformer rating? |
| A. | 230 VA |
| B. | 4600 VA |
| C. | 9430 VA |
| D. | 9200 VA |
| Answer» D. 9200 VA | |
| 11. |
From the below given statements regarding sequence control of ac voltage, which of them are true? |
| A. | It improves system power factor |
| B. | It reduces the harmonic content at the output |
| C. | Wider control of output voltage is possible |
| D. | only (i) |
| Answer» E. | |
| 12. |
A two stage sequence control is |
| A. | two SCRs in anti parallel |
| B. | two voltage controllers in parallel |
| C. | two voltage controllers in series |
| D. | a voltage controller having two voltage level |
| Answer» C. two voltage controllers in series | |
| 13. |
Sequence control of ac voltage controllers is employed for the improvement of _________ |
| A. | output frequency |
| B. | input frequency |
| C. | commutation |
| D. | system power factor |
| Answer» E. | |