BJT Construction and Operation MCQ’s

Analog Electronic Circuits Electronics & Communication Engineering

This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “BJT Construction and Operation”.

1. In a BJT, the outer layers are much more thick as compared to the middle layer.
a) True
b) False

2. In a BJT, which of the following layers is heavily doped?
a) Collector
b) Emitter
c) Base
d) Electron

3. Which of the following is not a valid type of BJT?
a) PNP
b) NPN
c) PPN
d) NNP

4. Considering the resistances of emitter, collector and base to be Re, Rc and Rb respectively, which of the following is the correct statements?
a) Re > Rb > Rc
b) Rc > Rb > Re
c) Rb > Rc > Re
d) Rb = Rc > Re

5. Which of the following statements is true about proper functioning of a BJT?
a) One junction is forward biased and one is reverse biased
b) Both junctions are forward biased
c) Both junctions are reverse biased
d) Can’t be determined

6. The collector current in a BJT is temparature-independent.
a) True
b) False

7. In a pnp-BJT, when the E-B junction is forward biased and no voltage is applied across C-B junction, what happens to the width of the depletion region in the E-B junction?
a) Increases
b) Decreases
c) Remains same
d) Can’t be determined

8. What is the typical order of magnitude of the base current for a BJT?
a) 10 -8
b) 10 -9
c) 10 -6
d) 10 -3

9. Which of the following currents in a BJT is also called leakage current?
a) IC
b) IE
c) ICO
d) ICBO

10. Which of the following relations are correct?
a) IE + IB = IC
b) IC + IB = IE
c) IE + IC = IB
d) IB + IE = IB

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