

MCQOPTIONS
Saved Bookmarks
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. |
For the same triggering angle and ratings |
A. | a semi-converter operates at lower output voltage than a full converter |
B. | a semi-converter operates at higher output voltage than a full converter |
C. | a semi-converter has lower values of input p.f as compared to a full converter |
D. | a semi-converter has more THD as compared to a full converter |
Answer» C. a semi-converter has lower values of input p.f as compared to a full converter | |
2. |
A single-phase semi-converter circuit is supplying power to a motor load. The average value of load voltage is 176.72 V and the rms value is 219.3 V. Find the VRF (voltage ripple factor). |
A. | 0 |
B. | 0.735 |
C. | 0.569 |
D. | 2.48 |
Answer» C. 0.569 | |
3. |
A single-phase semi-converter is connected to a 230 V source and is feeding a load R = 10 Ω in series with a large inductance that makes the load current ripple free. For α = 45°, find the rectification efficiency. The RMS value of output voltage is 219.3 V |
A. | 96.54 % |
B. | 75.25 % |
C. | 89.45 % |
D. | 80.58 % |
Answer» E. | |
4. |
A single-phase semi-converter is connected to a 230 V source and is feeding a load R = 10 Ω in series with a large inductance that makes the load current ripple free. Find the average output current for α = 45°. |
A. | 14 A |
B. | 17 A |
C. | 10 A |
D. | 0 A |
Answer» C. 10 A | |
5. |
In any AC-DC circuit, the freewheeling action |
A. | improves the power handling capabilities |
B. | increases the THD |
C. | improves CDF |
D. | all of the mentioned |
Answer» D. all of the mentioned | |
6. |
For the circuit shown below, T1 and T2 (from top T1 and T2) are both fired at an angle α. Then from ωt = π to ωt = π+α |
A. | None of the devices conduct |
B. | T1 and one diode will conduct |
C. | T2 and one diode will conduct |
D. | Both the diodes will conduct |
Answer» E. | |
7. |
Find the circuit turn-off time (Tc) for the below given semi-converter configuration. Take α = 30° and Vs = 230√2 sin100t |
A. | 20π radians |
B. | 5π/6 radians |
C. | for the below given semi-converter configuration. Take α = 30° and Vs = 230√2 sin100ta) 20π radiansb) 5π/6 radiansc) π/120 radians |
D. | 3/π radians |
Answer» D. 3/π radians | |
8. |
In the below given circuit, from ωt = π to α+π and continuous load current configuration |
A. | T1 and T2 conduct |
B. | T2 and D1 conduct |
C. | T1 and D2 conduct |
D. | T1 and D1 conduct |
Answer» D. T1 and D1 conduct | |
9. |
A single-phase asymmetrical semi-converter employs |
A. | one SCR and one diode in each leg |
B. | two SCRs in one leg and two diodes in the other |
C. | two SCRs in both the legs |
D. | two diodes in both the legs |
Answer» C. two SCRs in both the legs | |
10. |
A single-phase symmetrical semi-converter employs |
A. | one SCR and one diode in each leg |
B. | two SCRs and two diodes in each leg |
C. | two SCRs in each leg |
D. | two diodes in each leg |
Answer» B. two SCRs and two diodes in each leg | |