Which of the following is true in case of an unbiased p-n junction diode?

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

Diffusion does not take place

Diffusion of electrons & holes goes on infinitely

There is zero electrical potential across the junctions

Charges establish an electric field across the junctions

Correct Answer : Option (D) : Charges establish an electric field across the junctions

Explanation : A potential difference is established across the junctions due to recombination of holes & electrons. This growing filed (barrier potential) stops the further diffusion.

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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