In a circuit using a full wave converter (M - 2 connection) the PIV of each thyristor is 400 V. For the same output voltage and fully controlled bridge converter, PIV will be
Answer: C
In bridge connection PIV is half of that in M-2 connection.
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A thyristor has maximum allowable junction temperature of 110° C and the ambient temperature is 40°C, If the maximum internal power dissipation is 50 W, the thermal resistance is
Answer: B
No Explanation.
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A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is
Answer: B
Conduction occurs only during 50% of wave.
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Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V.
Reason (R): When an SCR is conducting, the junction temperature is about 200°C.
Answer: C
Junction temperature is about 120°C. Hence R is wrong.
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Assertion (A): A TRIAC is a bidirectional SCR.
Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.
Answer: A
Since a TRIAC can conduct in both directions it is bi directional SCR.
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In a single phase full wave ac regulator the rms value of load current is 20 A load is purely resistive. Then
Answer: B
Each thyristor conducts for 50% of time.
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Which of these commutation methods is used in AC-DC converters?
Answer: D
Class F is natural commutation AC = DC converter use natural (or line) commutation.
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The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by
Answer: B
Value of C is proportional to maximum difference between reverse charge of SCRs in series.
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A thyristor is reverse biased. A positive gate pulse is applied. The thyristor
Answer: C
Thyristor can turn on only when it is forward biased.
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The waveshape of output voltage of half bridge inverter is
Answer: B
No answer description available for this question.
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