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Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

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Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

(a) GTO

(b) BJT

(c) MOSFET

(d) TRIAC

I have been asked this question during a job interview.

This interesting question is from Modified Speed Torque Characteristics of DC Shunt Motors in division Characteristics of DC & AC Motors of Electric Drives

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Correct choice is (c) MOSFET

Easiest explanation: MOSFET has a low power rating and high-frequency rating and so it can be used in low power switch mode power supply. MOSFET stands for metal oxide silicon field effect transistor.

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