During gate recovery time_____________?

Byadmin March 2, 2018August 9, 2021

During gate recovery time_____________?

A. charge carriers of J2 junction recombined
B. charge carriers of J2 junction is swept out
C. charge carrier of J1 junction removed
D. charge carriers of J3 junction is removed

Power Electronics

Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?

Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?

A. Negatively affected by firing angle
B. Negatively affected by distortion of the input current
C. Positively affected by both firing angle and distortion of the input current
D. Both (a) and (b)

Read More Due to non sinusoidal waveform of the input current, the power factor of the rectifier is____________?
Power Electronics

A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?

A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?

A. 30° to 150°.
B. 30° to 180°.
C. 60° to 120°.
D. 60° to 180°.

Read More A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?
Power Electronics

Regulator sampling PWM is usually used in___________?

Regulator sampling PWM is usually used in___________?

A. High power inverters
B. Rectifiers
C. Low power inverters
D. Only A. and B.

Read More Regulator sampling PWM is usually used in___________?
Power Electronics

Delay time is defined by the interval when_______________?

Delay time is defined by the interval when_______________?

A. gate current increases from 90 % to 100 % of its final value
B. anode current reaches 10 % from forward leakage current
C. anode voltage drops from 100 % to 90 % of its actual value
D. all of these

Read More Delay time is defined by the interval when_______________?
Power Electronics

60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?

60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?

A. 76.3 %
B. 91.6 %
C. 83.3 %
D. 90.9 %

Read More 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?
Power Electronics

If the gate voltage of an SCR is removed, then the_______________?

If the gate voltage of an SCR is removed, then the_______________?

A. anode current decreases
B. anode current does not decrease at all
C. anode current increases
D. cathode current increases

Read More If the gate voltage of an SCR is removed, then the_______________?

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