Q. The efficiency of a chopper circuit is about

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Q. A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of thyristor current is

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Q. The main utility of SCR is due to

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Q. In a single phase full wave ac regulator the firing angles during both half cycles are equal.

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Q. In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is

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Q. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors

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Q. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is α. Then the waveshapes of voltages across thyristors

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Q. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is

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Q. Multiphase choppers are used in

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Q. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is α. Each thyristor conducts for a period

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Q. In a parallel inverter

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Q. A step up chopper can give an output voltage

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Q. The specified maximum junction temperature of thyristors is about

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Q. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains

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Q. A half bridge inverter

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Q. A 3 phase series inverter has

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Q. HVDC systems are preferable for only long distances.

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Q. Surge current rating of an SCR is

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Q. Which of the following devices has metal-silicon junction?

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Q. In a series inverter

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