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Why the cost of MOSFET based power amplifier is less?

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Why the cost of MOSFET based power amplifier is less?

(a) High impedance

(b) Low capacitance

(c) Low power dissipation

(d) Lesser in size

This question was addressed to me by my school principal while I was bunking the class.

My question is based upon Class D Amplifiers topic in section Power Amplifiers of Electronic Devices & Circuits

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Right answer is (c) Low power dissipation

The best I can explain: Since power dissipation in MOSFET is less, this results in smaller heat sinks and thus the cost of the amplifier will be reduced.

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