Transistors and Applications problems
- 1. The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is
Options- A.
- B. re ≈ 25 mV × IC
- C.
- D.
Discuss
Correct Answer:
- 2. Which of the following conditions are needed to properly bias an npn transistor amplifier?
Options- A. Forward bias the base/emitter junction and reverse bias the base/collector junction.
- B. Forward bias the collector/base junction and reverse bias the emitter/base junction.
- C. Apply a positive voltage on the n-type material and a negative voltage on the p-type material.
- D. Apply a large voltage on the base. Discuss
Correct Answer: Forward bias the base/emitter junction and reverse bias the base/collector junction.
- 3. The signal voltage gain of an amplifier, Av, is defined as:
Options- A.
- B. Av = IC × RC
- C.
- D.
Discuss
Correct Answer:
- 4. A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. A decrease in base current of a CE amplifier causes the voltage measured between the emitter and the collector to increase.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. Base currents are usually small because of the physical construction of the thin and lightly doped base.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. The beta of a BJT is the ratio of collector current to emitter current.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. A practical CE amplifier has the input on the base and the output taken off the emitter.
Options- A. True
- B. False Discuss
Correct Answer: False
- 9. An essential requirement of a feedback oscillator is a phase shift around the feedback loop of 360°.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. In an n-type JFET, current will flow when a positive voltage is applied to the drain and a negative voltage is applied to the source.
Options- A. True
- B. False Discuss
Correct Answer: True
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