300+ TOP MCQs on Bipolar Junction Transistor and Answers

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MCQs on Bipolar Junction Transistor :

1. For a transistor to operate in an active region what is the essential possible condition of biasing?
(A) Collector-base and emitter-base junctions are reverse biased.
(B) Collector-base junction is reverse biased and the emitter-base is forward biased
(C) Collector-base and emitter-base junctions are forward biased
(D) Collector-base junction is forward biased  and emitter-base is reverse biased

Answer

Answer: (B) Collector-base junction is reverse biased and the emitter-base is forward biased

2. Which operating region of BJT enables Emitter-base & collector-base junctions to undergo perfect short-circuit configuration?
(A) Saturation Region
(B) Cut-off Region
(C) Active Region
(D) None

Answer

Answer: (B) Saturation Region

3. When zero input control signal is applied which functional mode enables the BJT to act as an open switch?
(A) Reversed biased mode of BE junction
(B) Reversed as well as the forward-biased mode of BE junction
(C) Forward biased mode of BE junction
(D) None

Answer

Answer: (D) None

4. The power dissipated by a transistor approximately equals the collector current times.
(A) Collector-emitter voltage
(B) Base-emitter voltage
(C) Base supply voltage
(D) 0.7 V

Answer

Answer: (A) collector-emitter voltage

5. Which of the following leakage current causes a small collector current with zero base current
(A) Collector diode
(B) Base diode
(C) Emitter diode
(D) Transistor

Answer

Answer: (A) Collector diode

6. What will be the answer if we recalculate the collector-emitter voltage with the second approximation?
(A) The same as the ideal value
(B) Larger than the ideal value
(C) Smaller than the ideal value
(D) incorrect

Answer

Answer: (B) Larger than the ideal value

7. Will a transistor act as a closed switch by defining the requisite magnitude of saturation level with an equivalent amount of 
(A) negative control voltage
(B) both negative & positive control voltages
(C) positive control voltage
(D) none of the above

Answer

Answer: (A) positive control voltage

8. Which current source is connected between collector and base terminals in order to supervise the consequences of base control in an active region DC Model of BJT?
(A) αI_B
(B) βI_B
(C) αI_E
(D) βI_E

Answer

Answer: (B) βI_B

9. What is the collector current when the base resistor is open?
(A) 1 mA
(B) 2 mA
(C) 0
(D) 10 mA

Answer

Answer: (C) 0

10. For the second approximation what is the base-emitter voltage?
(A) 0.3 V
(B) 0.7 V
(C) 0
(D) 1 V

Answer

Answer: (B) 0.7 V