Electronic Devices-BJIt Amplifiers
Electronic Devices-BJIt Amplifiers
12. What is the range of the current gain for BJT transistor amplifiers?
- less than 1
- 1 to 100
- above 100
- All of the above
13. What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate?
- The output and input voltages are 180º out of phase.
- Gain is smaller than 1.
- Gain is larger than 1.
- None of the above
14. For the common-emitter fixed-bias configuration, there is a ________ phase shift between the input and output signals.
- 0º
- 45º
- 90º
- 180º
15. Which one of the following configurations has the lowest input impedance?
- Fixed-bias
- Common-base
- Emitter-follower
- Voltage-divider?
16. Which of the following represent(s) the advantage(s) of the system approach over the r-model approach?
- Thevenin's theorem can be used.
- The effect of changing the load can be determined by a simple equation.
- There is no need to go back to the ac equivalent model and analyze the entire network.
- All of the above
17. The differential amplifier has
- one input and one output.
- two inputs and two outputs.
- two inputs and one output.
- one input and two outputs.
18. The emitter-follower configuration has a ________ impedance at the input and a ________ impedance at the output.
- low, low
- low, high
- high, low
- high, high
19. The differential amplifier produces outputs that are
- common mode.
- in-phase with the input voltages.
- the sum of the two input voltages.
- the difference of the two input voltages.
20. The ________ configuration is frequently used for impedance matching.
- fixed-bias
- voltage-divider bias
- emitter-follower
- collector feedback