In the principle of phase control

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

control cannot be achieved

the load is on for some cycles and off for some cycles

control is achieved by adjusting the number of on off cycles

control is achieved by adjusting the firing angle of the devices

Correct Answer : Option (D) : control is achieved by adjusting the firing angle of the devices

Explanation : Switching devices is so operated that the load gets connected to ac source for a part of each half cycle

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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