Transistor in saturation region works as _______. 

This question was previously asked in
RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Switch
  2. Attenuator
  3. Oscillator 
  4. Amplifier

Answer (Detailed Solution Below)

Option 1 : Switch
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Detailed Solution

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  • When a transistor works as a switch it works in cut-off and saturation regions.
  • In the cut-off state, both the emitter-base junction and the collector-base junctions are reverse biased.
  • But in the saturation region, both the junctions are forward biased.

This is explained with the help of the following circuit diagram:

SSC JE Electrical 91 12Q Jan 27th First Shift Hindi 1

The transistor is said to be ON in the saturation region. 

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