Transistor as a Switch MCQ’s

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This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Transistor as a Switch”.

1. In which region a transistor acts as a closed switch?
a) cut off region
b) inverted region
c) active region
d) saturated region

2. Which of the following circuits act as a switch?

electronic-devices-circuits-questions-answers-transistor-switch-q3

a)

electronic-devices-circuits-questions-answers-transistor-switch-q3a

b)

electronic-devices-circuits-questions-answers-transistor-switch-q3b

c)

electronic-devices-circuits-questions-answers-transistor-switch-q3c

d)

3. In which region a transistor acts as an open switch?
a) cut off region
b) inverted region
c) active region
d) saturated region

4. The current which is helpful for LED to turn on is_________
a) emitter current
b) base current
c) collector current
d) depends on bias

5. The base emitter voltage in a cut off region is_________
a) greater than 0.7V
b) equal to 0.7V
c) less than 0.7V
d) cannot be predicted

6. The base emitter voltage in a saturation region is_________
a) greater than 0.7V
b) equal to 0.7V
c) less than 0.7V
d) cannot be predicted

7. Which of the following statements is true?
a) Solid state switches are applications for an AC output
b) LED’s can be driven by transistor logics
c) Only NPN transistor can be used as a switch
d) Transistor operates as a switch only in active region

8. In saturation region, the depletion layer_________
a) increases linearly with carrier concentration
b) decreases linearly with carrier concentration
c) increases by increasing the emitter current
d) decreases by decreasing the emitter voltage drop

9. The switching of power with a PNP transistor is called_________
a) sourcing current
b) sinking current
c) forward sourcing
d) reverse sinking

10. The switching of power with a NPN transistor is called_________
a) sourcing current
b) sinking current
c) forward sourcing
d) reverse sinking

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