In three-level modulation - Power Electronics

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

In three-level modulation

the output voltage is zero in the first half cycle.

the output voltage either zero or positive in the first half cycle.

the output voltage either zero or negative in the first half cycle.

the output voltage either zero, positive or negative in the first half cycle.

Correct Answer : Option (D) : the output voltage either zero, positive or negative in the first half cycle.

Explanation : In stepped wave inverters, one of the inverters is so gated as to obtain a three level modulation.

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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