MCQOPTIONS
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MCQOPTIONS
This section includes 10 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 full converter charges a battery from a three-phase supply of 230 V. Find the value of the power delivered to the load if a continues current of 20A is flowing through the battery of emf 200 V and internal resistance of 0.5 Ω. |
| A. | 0 W |
| B. | 5600 W |
| C. | 4200 W |
| D. | 1040 W |
| Answer» D. 1040 W | |
| 2. |
A three-phase full converter charges a battery from a three-phase supply of 230 V. The battery emf is 200 V. Find the value of the firing angle if the battery terminal voltage is 210 V. |
| A. | 36.54° |
| B. | 56.7° |
| C. | 89.3° |
| D. | 47.45° |
| Answer» E. | |
| 3. |
A three-phase full converter charges a battery from a three-phase supply of 230 V. The battery emf is 200 V and the internal resistance of the battery is 0.5 Ω. Find the value of the continuous current which is flowing through the battery if its terminal voltage is 210 V |
| A. | 10 A |
| B. | 20 A |
| C. | 0.5 A |
| D. | 25 A |
| Answer» C. 0.5 A | |
| 4. |
For a three-phase full controlled converter with R load, the average value of output voltage is zero for |
| A. | α = 0° |
| B. | α = 90° |
| C. | α = 180° |
| D. | It can never be zero |
| Answer» C. α = 180° | |
| 5. |
For the below given circuit, the conduction sequence for the negative group of SCRs is |
| A. | T4-T6-T2 |
| B. | T1-T2-T3 |
| C. | T2-T6-1 |
| D. | T2-T4-T6 |
| Answer» E. | |
| 6. |
In case of a three phase full controlled converter with 6 SCRs, commutation occurs every |
| A. | 120° |
| B. | 60° |
| C. | 180° |
| D. | 30° |
| Answer» C. 180° | |
| 7. |
For a three phase full controlled converter, with 3 thyristors in the upper or positive group and 3 thyristors in the lower or negative group, at any given time |
| A. | two thyristors are conducting from each group |
| B. | one thyristor is conducting from each group |
| C. | one thyristor is conducting from either of the groups |
| D. | all 6 thyristors are conducting at a time |
| Answer» C. one thyristor is conducting from either of the groups | |
| 8. |
For the below given circuit, α = 60°. T2 will start conduction at ωt = __________ Assume the inductor L value to be negligible. |
| A. | 60° |
| B. | 120° |
| C. | 90° |
| D. | 150° |
| Answer» D. 150° | |
| 9. |
A three phase six pulse full converter works as a ac to dc converter for firing angles in the range |
| A. | α > 90 |
| B. | 90 < α < 180 |
| C. | 0 < α < 90 |
| D. | 0 < α < 360 |
| Answer» D. 0 < α < 360 | |
| 10. |
A three phase full converter will require __________ number of SCRs. |
| A. | 3 |
| B. | 6 |
| C. | 9 |
| D. | 2 |
| Answer» C. 9 | |