ECE :: Power Electronics
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In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is
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A high frequency series inverter consists of
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In an SCR, the anode current consists of
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In the below figure, the average value of load current is 15 A. The load is highly inductive. The peak value of thyristor current is
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A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
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Assertion (A): A high dv/dt may cause triggering of a thyristor.
Reason (R): A high dv/dt results in charging current in the thyristor.
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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.
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In controlled heating circuits, thyristors act as
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In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
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A.
rectification efficiency will be more than 0.6 and TUF will be more than 0.35
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B.
rectification efficiency will be more than 0.6 but TUF will be less than 0.35
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C.
rectification efficiency will be less than 0.6 and TUF will be less than 0.35
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D.
rectification efficiency will be less than 0.6 but TUF will be more than 0.35
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