In three-level modulation

A)
the output voltage is zero in the first half cycle.
B)
the output voltage either zero or positive in the first half cycle.
C)
the output voltage either zero or negative in the first half cycle.
D)
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 ______
A)
only rectifier
B)
only inverter
C)
both inverter and rectifier
D)
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.
A)
higher corona loss
B)
smaller transformer size
C)
smaller power transfer capabilities
D)
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.
A)
MOSFET
B)
Chopper
C)
Phase control
D)
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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