Q. A chopper cannot be line commutated.

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Q. Natural commutation can be used in :

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Q. In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

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Q. A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

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Q. McMurray Bedford full bridge inverter uses

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Q. A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then

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Q. Which of the following devices exhibit negative resistance characteristics?

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Q. In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be

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Q. All other parameters remaining the same, a 3 phase bridge inverter with 180° mode of operation

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Q. As compared to BJT, MOSFET has

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Q. A current source inverter has simple commutation circuit.

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Q. In load commutated chopper, the commutating element

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Q. In a half bridge inverter each thyristor is gated at a frequency f. The output frequency is

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Q. Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor

Reason (R): Transistors are manufactured in very high voltage and current ratings.

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Q. Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3° C/W

Reason (R): Heat sinks of thyristors are generally made of aluminium.

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Q. In a thyristors are i = kvᵃ. The value of a is

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Q. In an ordinary thyristor

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Q. Thyristors connected in series need :

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Q. If 4 quadrant operation is required we need

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Q. Which of these commutation methods uses an external pulse for commutation?

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