Q. A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are

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Q. A TRIAC can be turned on :

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Q. In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of

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Q. A fully controlled bridge converter can operate in quadrants

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Q. A class E chopper

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Q. A cycloconverter uses

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Q. Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.

Reason (R): A semi converter is cheaper than a full converter.

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Q. A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ωt. The KVL equation to find firing angle a is

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Q. A single phase cycloconverter with centre tapped input transformer requires

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Q. In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

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Q. The number of thyristors in a single phase fully controlled bridge rectifier is

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Q. In a bridge inverter

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Q. An ideal rectifier should have

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Q. When thyristors are connected in parallel, the current distribution may become non-uniform due to

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Q. As compared to a p-n junction diode

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Q. From which instant is the turn off time of a thyristor defined

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Q. In a single phase cycloconverter with centre tapped transformer

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Q. Thyristors can be used for control of

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Q. A crowbar circuit is generally needed for protection under fault conditions.

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Q. Forward dv/dt rating of an SCR is

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