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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Q. In a dual converter operated in circulating current mode, the circulating current flows

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Q. A class B chopper operates in third quadrant.

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Q. In a full bridge circuit supplying an RLC under damped circuit

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Q. In a single phase half wave ac regulator feeding a resistive load, the rms load current

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Q. In a bridge inverter with single pulse width modulation

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Q. In a modified series inverter with two inductors and two capacitors, the load current

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Q. The number of layers in a Shockley diode are

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Q. The load circuit of a single phase full bridge inverter

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Q. When an SCR is reverse biased

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Q. A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

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Q. In Jone chopper, the commutating element

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Q. A LASCR has

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Q. In a modified series inverter

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Q. Assertion (A): Light triggering is very suitable for HVDC transmission.

Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.

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Q. Class A and class B chopper

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Q. To turn off an SCR, it is necessary to reduce its current to less than :

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Q. When a single phase dual converter is operating in circulating current mode

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Q. In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of

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Q. The total number of leads in SCR, DIAC and TRIAC respectively are

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