In a 3-âˆ… controlled bridge rectifier, the frequency of ripple in the output voltage depends on

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

Firing angle

Power factor

Supply frequency

Voltage source

Correct Answer : Option (C) : Supply frequency

Explanation : In a three-phase controlled bridge rectifier, the ripple frequency in the output voltage depends on supply frequency. The frequency of ripple in the output voltage

Fout = total number of pulses × supply frequency

In a 3-Ø controlled bridge rectifier, the ripple frequency in the output voltage is 6 times the supply frequency.

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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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