A heat sink is used with a transistor to 

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KVS TGT WET (Work Experience Teacher) 8 Jan 2017 Official Paper
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  1. prevent excessive temperature rise. 
  2. increase forward current.
  3. increase reverse current.
  4. increase forward voltage.

Answer (Detailed Solution Below)

Option 1 : prevent excessive temperature rise. 
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Detailed Solution

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To prevent BJT from bursting due to excess heat 

  • Collector area is increased
  • heat sink is used

Heat sink :

A heat sink is a component that increases the heat flow away from a hot device. It accomplishes this task by increasing the device's working surface area and the amount of low-temperature fluid that moves across its enlarged surface area.

Hence correct option is "1"

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