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Online MCQ Assignment
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1. For a BJT, for common base configuration the input characteristics is represented by a plot between which of the following parameters?
a) VBE and IE
b) VBE and IB
c) VCE and IC
d) None of the mentioned

Answer: a [Reason:] For a BJT, the input characteristics is given by a plot between VBE and IB.

2. For a BJT, for common base configuration the output characteristics is represented by a plot between which of the following parameters?
a) VBE and IB
b) VCE and IC
c) VCB and IC
d) None of the mentioned

Answer: c [Reason:] For a BJT, the output characteristics is given by a plot between VCE and IC.

3. In a BJT, if the collector-base junction is reverse-biased and the base-emitter junction is forward-biased, which region is the BJT operating in?
a) Saturation region
b) Active region
c) Cutoff region
d) None of the mentioned

Answer: b [Reason:] If the collector-base junction is reverse-biased and the base-emitter junction is forward-biased,then the BJT functions in the active region of the output characteristics.

4. In a BJT, if the collector-base junction is forward-biased and the base-emitter junction is forward-biased, which region is the BJT operating in?
a) Saturation region
b) Active region
c) Cutoff region
d) None of the mentioned

Answer: a [Reason:] If the collector-base junction and the base-emitter junction are both forward-biased,then the BJT functions in the saturation region of the output characteristics.

5. In a BJT, if the collector-base junction and the base-emitter junction are both reverse-biased, which region is the BJT operating in?
a) Saturation region
b) Active region
c) Cutoff region
d) None of the mentioned

Answer: c [Reason:] If the collector-base junction and the base-emitter junction are both reverse-biased,then the BJT functions in the cutoff region of the output characteristics.

6. From the given characteristics, what is the value of IC at IB=30 uA and VCE=10 V? a) 3 mA
b) 3.4 mA
c) 0 mA
d) None of the mentioned

Answer: b [Reason:] At the intersection of IB=30 uA and VCE=10 V, IC=3.4 mA.

7. From the given characteristics, what is the value of IC at VBE=0.7 V and VCE=15 V? a) 3.4 mA
b) 0 mA
c) 2.5 mA
d) 10 mA

Answer: c [Reason:] From the characteristics, the value of IB at VBE=0.7V is 20uA. Now, from IB=20 uA, we get IC = 2.5 mA.

8. Which of the following correctly determines the relation between α and β?
a) β=α/(1-α)
b) α=β/(1-α)
c) β=α/(1-β)
d) None of the mentioned

Answer: a [Reason:] α and β are related as β=α/(1-α).

9. The value of IC is precisely zero when the value of IE is zero.
a) True
b) False