In an SCR, the anode current consists of only holes only electrons both electron

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Question
In an SCR, the anode current consists of
Options
A. only holes
B. only electrons
C. both electrons and holes
D. either electrons or holes

Correct Answer

both electrons and holes

Explanation

Both electrons and holes contribute to current.

Power Electronics problems

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3. In the below figure the rms voltage across each half of secondary is 200 V. The peak inverse voltage across each of thyristor is
Options
A. 200 V
B. 2(200) V
C. 2(400) V
D. 800 V

4. A thyristor has its gate current zero. To start conduction the forward voltage must exceed
Options
A. about 0.5 V
B. forward breakover voltage
C. on state voltage
D. peak working off state forward voltage

5. A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is
Options
A. V_m
B. 0.5 V_m
C. zero
D. 0.5 V_m - voltage drop across inductance

7. In a single phase dual converter, a₁, and a₂ are firing angles of the two converters. Then
Options
A. a₁ - a₂ =
B. a₁ + a₂ = p
C. a₁ - a₂ = p
D. a₁ + a₂ =

8. A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is
Options
A. 20 mH
B. about 31 mH
C. about 51 mH
D. about 92 mH

10. The gate current required to turn on an SCR is
Options
A. few amperes
B. a few mA
C. almost equal to anode current
D. about 50% of anode current

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