Input Bias and Offset Currents of the Bipolar Differential Amplifier MCQ’s

Electronic Devices & Circuits Electronics & Communication Engineering

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Input Bias and Offset Currents of the Bipolar Differential Amplifier”.

1. Ideally, for non linear operation, a transistor should be biased so that the Q-point is ________
a) near saturation
b) near cut off
c) where Ic is maximum
d) halfway between cut off and saturation

2. The most stable biasing technique used is the ____________
a) voltage-divider bias.
b) base bias
c) emitter bias
d) collector bias

3. Which transistor bias circuit provides good Q-point stability with a single-polarity supply voltage?
a) Base bias
b) Collector feedback bias
c) Voltage divider bias
d) Emitter bias

4. What is the Q-point for a fixed-bias transistor with IB = 75 µ A , βDC = 100, VCC = 20 V, and RC = 1.5 K Ohm?
a) VC = 0 V
b) VC =12.25V
c) VC = 8.75 V
d) VC = 20V

5. Which transistor bias circuit arrangement has poor stability because its Q-point varies widely with β DC?
a) base bias
b) voltage-divider bias
c) emitter bias
d) collector bias

6. Voltage-divider bias has a relatively stable Q-point, as does_________
a) base bias
b) collector-feedback bias
c) emitter bias
d) both base and emitter bias

7. Emitter bias requires _______
a) only a positive supply voltage
b) only a negative supply voltage
c) no supply voltage
d) both positive and negative supply voltage

8. What is the most common bias circuit?
a) Base
b) Collector
c) Emitter
d) Voltage-divider

9. The linear (active) operating region of a transistor lies along the load line below ________ and above ___________
a) cut off, saturation
b) saturation, cut off
c) active, saturation
d) cut off, active

10. The input resistance of the base of a voltage-divider biased transistor can be neglected _________
a) at all times
b) only if the base current is much smaller than the current through R2 (the lower bias resistor)
c) at no time
d) only if the base current is much larger than the current through R2 (the lower bias resistor

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