Electronic Devices-BJIt Amplifiers
Electronic Devices-BJIt Amplifiers
31. For a common-emitter amplifier, the purpose of the emitter bypass capacitor is
- no purpose, since it is shorted out by RE.
- to reduce noise.
- to despike the supply voltage.
- to maximize amplifier gain.
32. For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.
- voltage
- current
- impedance
- All of the above
33. The loaded voltage gain of an amplifier is always more than the no-load level.
- TRUE
- FALSE
34. What is the limit of the efficiency defined by = Po / Pi?
- Greater than 1
- Less than 1
- Always 1
- None of the above
35. Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?
- Small-signal
- Large-signal
- Small- or large-signal
- None of the above
36. The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.
- resistive, ohms, megohms
- capacitive, microfarads, farads
- inductive, millihenrys, henrys
- None of the above
37. The ________ the source resistance and/or ________ the load resistance, the less the overall gain of an amplifier.
- smaller, smaller
- smaller, larger
- larger, smaller
- larger, larger
38. A Darlington pair provides beta ________ for ________ input resistance.
- multiplication, decreased
- multiplication, increased
- division, decreased
39. A Darlington pair amplifier has
- high input impedance and high voltage gain.
- low input impedance and low voltage gain.
- a voltage gain of about 1 and a low input impedance.
- a low voltage gain and a high input impedance.
40. A common-collector amplifier has high input impedance, good current gain, and a voltage gain of 1.
- TRUE
- FALSE