Bipolar Junction Transistors (BJT) problems
- 1. A transistor may be used as a switching device or as a:
Options- A. fixed resistor
- B. tuning device
- C. rectifier
- D. variable resistor Discuss
Correct Answer: variable resistor
- 2. If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point:
Options- A. off the load line
- B. nowhere
- C. up
- D. down Discuss
Correct Answer: down
- 3. If VCC = +18 V, voltage-divider resistor R1 is 4.7 kΩ, and R2 is 1500Ω, what is the base bias voltage?
Options- A. 8.70 V
- B. 4.35 V
- C. 2.90 V
- D. 0.7 V Discuss
Correct Answer: 4.35 V
- 4. What is the collector current for a C-E configuration with a beta of 100 and a base current of 30 µA?
Options- A. 30 µA
- B. .3 µA
- C. 3 mA
- D. 3 MA Discuss
Correct Answer: 3 mA
- 5. With low-power transistor packages, the base terminal is usually the:
Options- A. tab end
- B. middle
- C. right end
- D. stud mount Discuss
Correct Answer: middle
- 6. The Q point on a load line may be used to determine:
Options- A. VC
- B. VCC
- C. VB
- D. IC Discuss
Correct Answer: VB
- 7. For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?
Options- A. collector-emitter
- B. base-emitter
- C. collector-base
- D. cathode-anode Discuss
Correct Answer: collector-emitter
- 8. A collector characteristic curve is a graph showing:
Options- A. emitter current (IE) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant
- B. collector current (IC) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant
- C. collector current (IC) versus collector-emitter voltage (VC) with (VBB) base bias voltage held constant
- D. collector current (IC) versus collector-emitter voltage (VCC) with (VBB) base bias voltage held constant Discuss
Correct Answer: collector current (IC) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant
- 9. Which is the higher gain provided by a C-E configuration?
Options- A. voltage
- B. current
- C. resistance
- D. power Discuss
Correct Answer: power
- 10. If an input signal ranges from 20?40 µA (microamps), with an output signal ranging from .5?1.5 mA (milliamps), what is the ac beta?
Options- A. 0.05
- B. 20
- C. 50
- D. 500 Discuss
Correct Answer: 50
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