Q. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

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Q. In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to

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Q. In a half bridge inverter, the freewheeling diodes are needed

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Q. When a thyristor is conducting, the voltage drop across it

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Q. The advantage of modified series inverter with two inductors and two capacitors is

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Q. An SUS is

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Q. Which chopper circuit operates in quadrants 1 and 4?

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Q. Which of the following devices has two gates?

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Q. In auxiliary commutated chopper, the peak value of thyristor current is

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Q. The static equalisation circuit for thyristors connected in series is

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Q. The commutation method in an inverter, is

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Q. Inverters find applications in

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Q. When a thyristor is conducting, the voltage drop across it is about

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Q. The use of free wheeling diode in controlled rectifier improves the waveshape of load current.

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Q. As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.

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Q. In a certain inverter circuit each thyristor carries 26.67 A for 60°, 13.33 A for 120° and zero A for 180° of the cycle. The rms current of thyristor is

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Q. The factor η for a UJT is about

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Q. In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is

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Q. The cut in voltages for germanium and silicon diodes respectively as

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Q. Assertion (A): A GTO can be turned on and turned off by gate pulses

Reason (R): A GTO can be turned off by negative gate pulse.

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