Q. In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle

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Q. A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is

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Q. The total number of leads in SUS, SBS and SCS respectively are

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Q. Which of these devices can conduct in both directions?

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Q. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.

Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.

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Q. A 3 phase dual converter consists of

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Q. Which inverter circuit uses coupled inductors?

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Q. If the frequency is less than the damped frequency in a series- inverter

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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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