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Which of the following is not an application of transistor heat sinks?

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Which of the following is not an application of transistor heat sinks?

(a) Soldering

(b) Light Emitting Diode Lamps

(c) Microprocessor Cooling

(d) Environment Monitoring Systems

I got this question in an internship interview.

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

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Right option is (d) Environment Monitoring Systems

The explanation: Heat dissipation is an unavoidable by-product of electronic devices and circuits. LED performance and lifetime are strong functions of their temperature. Effective cooling is therefore essential. A case study of a LED based down lighter shows an example of the calculations done in order to calculate the required heat sink necessary for the effective cooling of lighting system. Temporary heat sinks are sometimes used while soldering circuit boards, preventing excessive heat from damaging sensitive nearby electronics.

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