Collector-to-Base Bias MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Collector-to-Base Bias”.

1. The collector to emitter voltage (VCE) is obtained by_________
a) VCC – RC(IC-IB)
b) VCC – RC(IC+IB)
c) VCC + RC(IC+IB)
d) VCC + RC(IC-IB)

2. What is the DC characteristic used to prove that the transistor is indeed biased in saturation mode?
a) IC = βIB
b) IC > βIB
c) IC >> βIB
d) IC < βIB

3. The collector current (IC) that is obtained in a collector to base biased transistor is_________
a) (VCC-VBE)/RB
b) (VCC+VBE)/RB
c) (VCE-VBE)/RB
d) (VCE+VBE)/RB

4. The thermal runway is avoided in a collector to base bias because_________
a) of its independence of β
b) of the positive feedback produced by the base resistor
c) of the negative feedback produced by the base resistor
d) of its dependence of β

5. The demerit of a collector to base bias is_________
a) its need of high resistance values
b) its dependence on β
c) its independence on β
d) the positive feedback produced by the base resistor

6. In the circuit, transistor has β =60, VBE=0.7V. Find the collector to emitter voltage drop VCE.

electronic-devices-circuits-questions-answers-collector-base-bias-q8

a) 5V
b) 3V
c) 8V
d) 6V

7. When the temperature is increased, what happens to the collector current after a feedback is given?
a) it remains same
b) it increases
c) it cannot be predicted
d) it decreases

8. The negative feedback does good for DC signal by_________
a) decreasing the gain
b) increasing the gain
c) stabilising the operating point
d) increasing the stability factor

9. In the circuit shown below, β =100 and VBE=0.7V. The Zener diode has a breakdown voltage of 6V. Find the operating point.

electronic-devices-circuits-questions-answers-collector-base-bias-q9


a) (6.7V, 5.3mA)
b) (5.7V, 5.3mA)
c) (6.7V, 5mA)
d) (6V, 5mA)

10. When the β value is large for a given transistor, the IC and VCE values are given by_________
a) (VCC-VBE)/RB, VCC-RCIC
b) (VCC+VBE)/RB, VCC-RC(IC+IB)
c) (VCC+VBE)/RB, VCC+RC(IC+IB)
d) (VCC+VBE)/RB, VCC+RC(IC-IB)

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