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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 semi-converter with RLE load and a freewheeling diode has discontinuous load current with firing angle α and extinction angle β. If β < π and Vm sinβ < E then |
A. | the converter operates as a line commutated inverter |
B. | the conduction period is absent |
C. | the freewheeling period is absent |
D. | none of the mentioned |
Answer» D. none of the mentioned | |
2. |
A semi-converter with RLE load and a freewheeling diode has discontinuous load current with firing angle α and extinction angle β. The freewheeling period is |
A. | π>ωt<β |
B. | π>ωt<β |
C. | π<ωt>β |
D. | π>ωt>β |
Answer» B. π>ωt<β | |
3. |
A semi-converter circuit gives the following voltage waveform on R load. Find the expression for the average output current with Vs = Vm sinωt and firing angle α |
A. | (Vm/Rπ) cosα |
B. | (Vm/Rπ) (1+cosα) |
C. | (2Vm/Rπ) cosα |
D. | (2Vm/Rπ) (1+cosα) |
Answer» C. (2Vm/Rπ) cosα | |
4. |
For the below given circuit configuration, the SCR is fired at angle α. For continuous current mode, find the expression for the average output voltage |
A. | (Vm/2π) (1+ cosα) |
B. | (Vm/2π) (2+ cosα) |
C. | (Vm/2π) (3+ cosα) |
D. | (3Vm/π) |
Answer» D. (3Vm/π) | |
5. |
For the below given circuit configuration, the SCR is fired at angle α. For continuous current mode from ωt = π to 2π |
A. | FD conducts |
B. | SCR and D1 conduct |
C. | D3 and D2 conducts |
D. | None of the mentioned |
Answer» D. None of the mentioned | |
6. |
A semi-converter circuit gives the following voltage waveform. Find the expression for the average output voltage with Vs = Vm sinωt and firing angle α |
A. | (Vm/π) cosα |
B. | (Vm/π) (1+cosα) |
C. | (2Vm/π) cosα |
D. | (2Vm/π) (1+cosα) |
Answer» C. (2Vm/π) cosα | |
7. |
In a semi-converter with RLE load during the freewheeling period, the energy is |
A. | fed back to the source |
B. | fed to the inductor(L) and absorbed by E |
C. | absorbed by the L & E and dissipated at R |
D. | fed to the L & E and dissipated at R |
Answer» E. | |
8. |
In the below shown semi-converter circuit T1 & T2 are fired at an angle α, the output voltage is zero when |
A. | π<ωt<α |
B. | 0<ωt<α+π |
C. | π<ωt<π+α |
D. | π<ωt<2π |
Answer» D. π<ωt<2π | |
9. |
In the below shown semi-converter circuit T1 & T2 are fired at an angle α, then from ωt = π to α+π |
A. | T1 is conducting |
B. | T2 is conducting |
C. | D1 is conducting |
D. | FD conducting |
Answer» E. | |
10. |
In the below shown semi-converter circuit, T1 and T2 are fired at an angle α, then from ωt = α to π |
A. | T1 and T2 conduct |
B. | T1 and D1 conduct |
C. | D1 and D2 conduct |
D. | FD conducts |
Answer» C. D1 and D2 conduct | |