In a VSI (Voltage source inverter)

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

the IGBTs are fired at 0 degrees.

the internal impedance of the AC source is negligible

the internal impedance of the DC source is very very high

the internal impedance of the DC source is negligible

Correct Answer : Option (D) : the internal impedance of the DC source is negligible

Explanation : A VSI is the one in which the internal impedance of the source is negligible. It has a stiff DC source at its input.

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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