Bipolar Junction Transistors (BJT) problems
- 1. To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?
Options- A. collector-emitter
- B. base-collector
- C. base-emitter
- D. collector-base Discuss
Correct Answer: collector-base
- 2. Voltage-divider bias provides:
Options- A. an unstable Q point
- B. a stable Q point
- C. a Q point that easily varies with changes in the transistor's current gain
- D. a Q point that is stable and easily varies with changes in the transistor's current gain Discuss
Correct Answer: a stable Q point
- 3. A transistor has a
of 250 and a base current, IB, of 20 µ A. The collector current, IC, equals:
Options- A. 500 µ A
- B. 5 mA
- C. 50 mA
- D. 5 A Discuss
Correct Answer: 5 mA
- 4. When a silicon diode is forward biased, what is VBE for a C-E configuration?
Options- A. voltage-divider bias
- B. 0.4 V
- C. 0.7 V
- D. emitter voltage Discuss
Correct Answer: 0.7 V
- 5. The ends of a load line drawn on a family of curves determine:
Options- A. saturation and cutoff
- B. the operating point
- C. the power curve
- D. the amplification factor Discuss
Correct Answer: saturation and cutoff
- 6. What is the current gain for a common-base configuration where IE = 4.2 mA and IC = 4.0 mA?
Options- A. 16.80
- B. 1.05
- C. 0.20
- D. 0.95 Discuss
Correct Answer: 0.95
- 7. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to:
Options- A. provide voltage gain
- B. provide phase inversion
- C. provide a high-frequency path to improve the frequency response
- D. buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer Discuss
Correct Answer: buffer the voltage amplifiers from the low-resistance load and provide impedance matching for maximum power transfer
- 8. If a 2 mV signal produces a 2 V output, what is the voltage gain?
Options- A. 0.001
- B. 0.004
- C. 100
- D. 1000 Discuss
Correct Answer: 1000
- 9. In a transistor, collector current is controlled by:
Options- A. collector voltage
- B. base current
- C. collector resistance
- D. all of the above Discuss
Correct Answer: base current
- 10. In a C-E configuration, an emitter resistor is used for:
Options- A. stabilization
- B. ac signal bypass
- C. collector bias
- D. higher gain Discuss
Correct Answer: stabilization
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