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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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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?
analog-electronic-circuits-questions-answers-bjt-configuration-q6
a) 3 mA
b) 3.4 mA
c) 0 mA
d) None of the mentioned

View Answer

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?
analog-electronic-circuits-questions-answers-bjt-configuration-q6
a) 3.4 mA
b) 0 mA
c) 2.5 mA
d) 10 mA

View Answer

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

View Answer

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

View Answer

Answer: b [Reason:] When the value of IE is zero, then the value of IC is equal to ICBO which is in the order of microamperes but not zero.

10. For common emitter configuration, which of the following is the correct relation?
a) IC < IE
b) IC = βIB
c) IC = αIE
d) All of the mentioned

View Answer

Answer: d [Reason:] All the relations hold true i.e. IC = βIB and IC = αIE. As α<1, hence IC < IE

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