Transistors and Applications problems
- 1. Often a common-collector will be the last stage before the load; the main function of this stage is to
Options- A. provide voltage gain
- B. buffer the voltage amplifiers from the low-resistance load
- C. provide phase inversion
- D. provide a high-frequency path to improve the frequency response Discuss
Correct Answer: buffer the voltage amplifiers from the low-resistance load
- 2. A JFET
Options- A. is a current-controlled device
- B. has a low input resistance
- C. is a voltage-controlled device
- D. is always forward-biased Discuss
Correct Answer: is a voltage-controlled device
- 3. To get a negative gate-source voltage in a self-biased JFET circuit, you must use a
Options- A. voltage divider
- B. source resistor
- C. ground
- D. negative gate supply voltage Discuss
Correct Answer: source resistor
- 4. A source follower has a voltage gain (Av) of
Options- A. AV = gmRd
- B. AV = gmRS
- C.
- D.
Discuss
Correct Answer:
- 5. Three different points are shown on a dc load line. The upper point represents the
Options- A. minimum current gain
- B. quiescent point
- C. saturation point
- D. cutoff point Discuss
Correct Answer: saturation point
- 6. In order for feedback oscillators to have any practical value, the gain has to be
Options- A. < 1
- B. self-adjusting
- C. stabilized
- D. nonlinear Discuss
Correct Answer: self-adjusting
- 7. The capacitor that produces an ac ground is called a(n)
Options- A. coupling capacitor
- B. dc open
- C. bypass capacitor
- D. ac open Discuss
Correct Answer: bypass capacitor
- 8. The depletion-mode MOSFET
Options- A. can operate with only positive gate voltages
- B. can operate with only negative gate voltages
- C. cannot operate in the ohmic region
- D. can operate with positive as well as negative gate voltages Discuss
Correct Answer: can operate with positive as well as negative gate voltages
- 9. In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid
Options- A. crossover distortion
- B. unusually high efficiency
- C. negative feedback
- D. a low input impedance Discuss
Correct Answer: crossover distortion
- 10. The primary function of the bias circuit is to
Options- A. hold the circuit stable at VCC
- B. hold the circuit stable at vin
- C. ensure proper gain is achieved
- D. hold the circuit stable at the designed Q-point Discuss
Correct Answer: hold the circuit stable at the designed Q-point
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