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Transfer characteristics [output voltage() vs input voltage ()] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used:
image

  1. A
    in region I
  2. B
    in region III
  3. C
    both in region (I) and (III)
  4. D
    in region II

Solution & Step-by-step Explanation

A transistor acts as a switch by operating either in the cut-off region (I) (where it is 'OFF') or in the saturation region (III) (where it is 'ON'). Region II is the active region used for amplification.

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Transfer characteristics [output voltage() vs input voltage ()] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used:
image
A
in region I
B
in region III
C
both in region (I) and (III)
D
in region II

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