Explore topic-wise MCQs in Power Electronics.

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