Discussion
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- Question
A source follower has a voltage gain (Av) of
Options- A. AV = gmRd
- B. AV = gmRS
- C.
- D.
- Correct Answer
-
- 1. 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
- 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
- 3. 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
- 4. The transformer turns ratio determines
Options- A. the ratio of primary and secondary voltages
- B. the ratio of primary and secondary currents
- C. the reflected impedance
- D. all of the above Discuss
- 5. A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 Ω load. What is the efficiency of the transformer?
Options- A. 88%
- B. 90%
- C. 92%
- D. 95% Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Transistors and Applications problems
Search Results
Correct Answer: source resistor
Correct Answer: is a voltage-controlled device
Correct Answer: buffer the voltage amplifiers from the low-resistance load
Correct Answer: all of the above
Correct Answer: 90%
Correct Answer: saturation point
Correct Answer: self-adjusting
Correct Answer: bypass capacitor
Correct Answer: can operate with positive as well as negative gate voltages
Correct Answer: crossover distortion
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