BJTs Current-Voltage Characteristics MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “BJTs Current-Voltage Characteristics”.

1. The curve between the collector current and the saturation is
a) A straight line inclined to the axes
b) A straight line parallel to the x-axis
c) A straight line parallel to the y-axis
d) An exponential curve

2. The magnitude of the thermal voltage is given by
a) k/Tq
b) kT/q
c) q/Kt
d) Tk/q

3. The curve between the collector current versus the potential difference between the base and emitter is
a) A straight line inclined to the axes
b) A straight line parallel to the x-axis
c) An exponentially varying curve
d) A parabolic curve

4. The correct relation between the transistor parameters α and ß are related by
a) ß = 1 – α/α
b) ß = 1 + α/α
c) α = ß + 1/ß
d) α = ß/ß + 1

5. The value of the thermal voltage at room temperature can be approximated as
a) 25 mV
b) 30 mV
c) 35 mV
d) 40 mV

6. The Early Effect is also called as
a) Base-width modulation effect
b) Base-width amplification effect
c) Both of the mentioned
d) None of the mentioned

7. The correct expression relating the emitter current Ie to the collector current Ic is
a) Ie = α Ic
b) Ic = α Ic
c) Ie = ß Ic
d) Ic = ß Ic

8. The correct relation between the emitter current Ie and the base current Ib is given by
a) Ib = (1 + α) Ie
b) Ib = (α – 1) Ie
c) Ie = (1 – ß) Ib
d) Ie = (1 + ß) Ib

9. For the BJT to operate in active mode Collector-Base junction must be
a) Heavily doped
b) Must reversed bias
c) Must be forward bias
d) Lightly doped

10. Collector current (Ic) reaches zero when
a) Vce = Vt ln (Isc/I)
b) Vt = Vce ln (Isc/I)
c) Vce = Vt ln (I/Isc)
d) Vce = Vt ln (Isc + I/I)

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