Q. The output frequency of a cycloconverter can be changed by changing the firing angle.

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Q. Mc Murray full bridge inverter uses

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Q. Assertion (A): A DIAC has four layers but only two terminals.

Reason (R): A DIAC can conduct in both directions.

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Q. In a 3 phase full converter, the instantaneous output voltage can have negative part if

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Q. A single phase half bridge inverter required to feed R-L loads needs

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Q. Typical values of di/dt (A/µ sec) and dv/dt (v/µ sec) for an SCR are in the range of

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Q. When a dc chopper feeds an RLE load, the load current, during steady state operation

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Q. When an SCR is in forward blocking mode, the applied voltage

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Q. In sinusoidal PWM for inverters the width of different pulses are not the same.

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Q. A class D chopper

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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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