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Which of the following characteristics makes passive heat sinks differently from active heat sinks?

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Which of the following characteristics makes passive heat sinks differently from active heat sinks?

(a) It possess mechanical components

(b) It possess electrical components

(c) Does not possess mechanical components

(d) It possess electrical & mechanical components

This question was posed to me during an interview.

I want to ask this question from Transistor Case and Heat Sinks in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right choice is (c) Does not possess mechanical components

The explanation is: Unlike active heat sink passive heat sink do not possess any mechanical component and are made of aluminum finned radiator.

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