In a dual converter both converters work as rectifiers. True False One operators

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Question
In a dual converter both converters work as rectifiers.
Options
A. True
B. False

Correct Answer

False

Explanation

One operators as rectifier and the other as inverter.

Power Electronics problems

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1. 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

2. 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

3. 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

4. In a 3 phase semiconverter, the firing frequency is
Options
A. equal to line frequency
B. 3 times the line frequency
C. 6 times the line frequency
D. 12 times the line frequency

5. In dielectric heating, the thyristor circuits consist of
Options
A. rectifier-chopper combination
B. controlled rectifier
C. ac regulator
D. rectifier-inverter combination

7. 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

9. 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 =

10. 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

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