Electronic Devices-BJIt Amplifiers
Electronic Devices-BJIt Amplifiers
21. When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain
- increases.
- decreases.
- has very little effect.
22. In a common-base amplifier, the input signal is connected to the
- base.
- collector.
- emitter.
- output.
23. Which of the following is (are) true to achieve a good overall voltage gain for the circuit?
- The effect of Rs and RL must be considered as a product.
- The effect of Rs and RL must be considered as a product and evaluated individually.
- The effect of Rs and RL must be evaluated individually.
- None of the above
24. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?
- leave circuit unchanged
- replace coupling and bypass capacitors with opens
- replace coupling and bypass capacitors with shorts
- replace VCC with ground
25. For the common-emitter amplifier ac equivalent circuit, all capacitors are
- effectively shorts.
- effectively open circuits.
- not connected to ground.
- connected to ground.
26. Which of the following define(s) the conversion efficiency?
- Ac power to the load/ac input power
- Ac power to the load/dc power supplied
- Dc output power/ac input power
- All of the above
27. Which of the following should be done to obtain the ac equivalent of a network?
- Set all dc sources to zero
- Replace all capacitors by a short-circuit equivalent.
- Remove all elements bypassed by the short-circuit equivalent.
- All of the above
28. For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.
- 0º
- 45º
- 90º
- 180º
29. The total gain of a multistage amplifier is the ________.
- sum of individual voltage gains
- sum of dB voltage gains
30. Which of the following configurations has an output impedance Zo equal to RC?
- Fixed-bias common-emitter
- Common-emitter voltage-divider with bypass capacitor
- Common-emitter voltage-divider without bypass capacitor
- All of the above