A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20Â°C. If thermal resistance is 1.6Â° C/W, the junction temperature is

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

164Â°C

114Â°C

94Â° C

84Â° C

Correct Answer : Option (D) : 84Â° C

Explanation : 1.6 = T-20/40 or T=84â°C

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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