MCQOPTIONS
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MCQOPTIONS
This section includes 14 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 M-6 controlled converter or 6-pulse half-wave controlled converter is obtained by using a transformer having |
| A. | a double delta connected secondary winding |
| B. | a double star connected secondary winding |
| C. | a double delta connected primary winding |
| D. | 6-windings on both primary and secondary sides |
| Answer» C. a double delta connected primary winding | |
| 2. |
Which of the below mentioned converter can operate in both 3-pulse and 6-pulse modes? |
| A. | 3-phase half wave controller |
| B. | 3-phase full converter |
| C. | 3-phase semi-converter |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
In a p-pulse converter, each SCR conducts for (per cycle) |
| A. | p radians |
| B. | p degrees |
| C. | p/2π radians |
| D. | 2π/p radians |
| E. | p radiansb) p degreesc) p/2π radiansd) 2π/p radians |
| Answer» E. p radiansb) p degreesc) p/2π radiansd) 2π/p radians | |
| 4. |
A 3-phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. The input voltage is 3-phase, 400 V, 50 Hz. The source current is given by the following relation.Find the value of 2nd harmonic source current amplitutue. |
| A. | 11.25 A |
| B. | 0.256 A |
| C. | 2.69 sin (ωt – 45) A |
| D. | 0 A |
| Answer» E. | |
| 5. |
A 3-phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. Find the DF (distortion factor). |
| A. | 1.414 |
| B. | 0 |
| C. | 0.707 |
| D. | 0.569 |
| Answer» D. 0.569 | |
| 6. |
A 3-phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. The input voltage is 3-phase, 400 V, 50 Hz. The source current is given by the following relation.Find the fundamental component of the source current amplitude. |
| A. | 11.03 |
| B. | 2.205 |
| C. | 11.03 sin 45 |
| D. | 46.98 |
| Answer» B. 2.205 | |
| 7. |
WHICH_OF_THE_BELOW_MENTIONED_CONVERTER_CAN_OPERATE_IN_BOTH_3-PULSE_AND_6-PULSE_MODES??$ |
| A. | 3-phase half wave controller |
| B. | 3-phase full converter |
| C. | 3-phase semi-converter |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
A_M-6_controlled_converter_or_6-pulse_half-wave_controlled_converter_is_obtained_by_using_a_transformer_having$ |
| A. | a double delta connected secondary winding |
| B. | a double star connected secondary winding |
| C. | a double delta connected primary winding |
| D. | 6-windings on both primary and secondary sides |
| Answer» C. a double delta connected primary winding | |
| 9. |
In a p-pulse converter, each SCR conducts for (per cycle? |
| A. | p radians |
| B. | p degrees |
| C. | p/2π radians |
| D. | 2π/p radians |
| Answer» E. | |
| 10. |
The commutation period when both incoming and outgoing SCRs are conducting due to source inductance is called as the |
| A. | conduction delay |
| B. | overlap period |
| C. | one on one period |
| D. | distorting angle |
| Answer» C. one on one period | |
| 11. |
What is the relationship between DF, CDF and PF? |
| A. | PF = CDF = DF |
| B. | PF = CDF/DF |
| C. | PF = DF/CDF |
| D. | PF = CDF x DF |
| Answer» E. | |
| 12. |
A 3-phase full converter delivers a ripple free load current of 10 A with a firing angle delay of 45°. Find the DF (distortion factor).$ |
| A. | 1.414 |
| B. | 0 |
| C. | 0.707 |
| D. | 0.569 |
| Answer» D. 0.569 | |
| 13. |
In a 3 phase, 12-pulse controlled converter for continuous conduction mode, each SCR conducts for __________ per cycle. |
| A. | π/6 radians |
| B. | 60 degrees |
| C. | 3π/2 radians |
| D. | 12 degrees |
| Answer» B. 60 degrees | |
| 14. |
In a 3 phase M-6 controlled converter for continuous conduction mode, each SCR conducts for __________ per cycle. |
| A. | 2π/6 radians |
| B. | 30 degrees |
| C. | 3π/2 radians |
| D. | 120 degrees |
| Answer» B. 30 degrees | |