If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then

Electronics and Communication Engineering (ECE) : Power Electronics - Quiz(MCQ)

the capacitor should be removed

the diode should be replaced by a diac

the diode should be replaced by a bjt

the diode should be shorted using a resistor

Correct Answer : Option (B) : the diode should be replaced by a diac

Explanation : The TRIAC is a bidirectional SCR, hence it will need gating in both the directions. This can be achieved by replacing the diode by a DIAC (bidirectional diode).

Recently Updated in Power Electronics Questions

Static UPS requires ______

only rectifier

only inverter

both inverter and rectifier

None of the above

Correct Answer : both inverter and rectifier

Explanation : Rectifier to converter the dc from the battery to ac. Inverter to charge the battery from mains.

HVDC transmission has ___________ as compared to HVAC transmission.

higher corona loss

smaller transformer size

smaller power transfer capabilities

smaller conductor size

Correct Answer : smaller conductor size

Explanation : The conductor size is smaller as there is no sink effect, and the whole conductor is utilized for transmitting power.

SPMS are based on the ________ principle.

MOSFET

Chopper

Phase control

Integral control

Correct Answer : Chopper

Explanation : SMPS (Switching mode power supply) are based on the chopper principle. The output dc voltage is controlled by varying the duty cycle of the chopper circuit.

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