For what portion of the signal cycle does each active element in a push-pull, Class AB amplifier conduct?

1. A More than 180 degrees but less than 360 degrees
2. B Exactly 180 degrees
3. C The entire cycle
4. D Less than 180 degrees

What is a Class D amplifier?

1. A An amplifier that uses switching technology to achieve high efficiency
2. B A low power amplifier that uses a differential amplifier for improved linearity
3. C An amplifier that uses drift-mode FETs for high efficiency
4. D An amplifier biased to be relatively free from distortion

What circuit is required at the output of an RF switching amplifier?

1. A A filter to remove harmonic content
2. B A high-pass filter to compensate for low gain at low frequencies
3. C A matched load resistor to prevent damage by switching transients
4. D A temperature compensating load resistor to improve linearity

What is the operating point of a Class A common emitter amplifier?

1. A Approximately halfway between saturation and cutoff
2. B Approximately halfway between the emitter voltage and the base voltage
3. C At a point where the bias resistor equals the load resistor
4. D At a point where the load line intersects the zero bias current curve

What can be done to prevent unwanted oscillations in an RF power amplifier?

1. A Tune the stage for minimum loading
2. B Tune both the input and output for maximum power
3. C Install parasitic suppressors and/or neutralize the stage
4. D Use a phase inverter in the output filter

What is a characteristic of a grounded-grid amplifier?

1. A High power gain
2. B Low input impedance
3. C High electrostatic damage protection
4. D Low bandwidth

Which of the following is the likely result of using a Class C amplifier to amplify a single-sideband phone signal?

1. A Reduced intermodulation products
2. B Increased overall intelligibility
3. C Reduced third-order intermodulation
4. D Signal distortion and excessive bandwidth

Why are switching amplifiers more efficient than linear amplifiers?

1. A Switching amplifiers operate at higher voltages
2. B The switching device is at saturation or cutoff most of the time
3. C Linear amplifiers have high gain resulting in higher harmonic content
4. D Switching amplifiers use push-pull circuits

What is characteristic of an emitter follower (or common collector) amplifier?

1. A Low input impedance and phase inversion from input to output
2. B Differential inputs and single output
3. C Acts as an OR circuit if one input is grounded
4. D Input and output signals in-phase

In Figure E7-1, what is the purpose of R1 and R2?

1. A Load resistors
2. B Voltage divider bias
3. C Self bias
4. D Feedback

In Figure E7-1, what is the purpose of R3?

1. A Fixed bias
2. B Emitter bypass
3. C Output load resistor
4. D Self bias

What type of amplifier circuit is shown in Figure E7-1?

1. A Common base
2. B Common collector
3. C Common emitter
4. D Emitter follower