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Electronic Devices & Circuits Thermal Design

A heat sink attached to a power transistor primarily reduces the thermal resistance from the device toward ambient so that?

AJunction temperature can be kept lower for a given power dissipation
BCurrent gain becomes infinite
CBase current becomes exactly zero
DThe transistor becomes a photodiode

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Correct Answer: A. Junction temperature can be kept lower for a given power dissipation

Explanation: A heat sink improves heat transfer away from the device, lowering junction temperature for a specified dissipated power and ambient condition.

Reference: Standard electronics: transistor heat sinking

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