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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Q. The number of leads in a DIAC are

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Q. The method of triggering SCS is

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Q. Assertion (A): A class C chopper can operate in first and second quadrants

Reason (R): A class B chopper operates only in second quadrant.

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Q. A single phase dual converter consists of

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Q. The snubber circuit consists of

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Q. The effect of source inductance in a 3 phase fully controlled bridge converter is to

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Q. In disc mounting of SCR

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Q. Assertion (A): Thyristors can be used in controlled heating, excitation systems of alternators, speed control of motors and HVDC

Reason (R): A static var system using thyristors is very commonly used in high voltage ac systems.

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