What is the purpose of neutralizing an amplifier?

1. A To limit the modulation index
2. B To eliminate self-oscillations
3. C To cut off the final amplifier during standby periods
4. D To keep the carrier on frequency

Which of these classes of amplifiers has the highest efficiency?

1. A Class A
2. B Class B
3. C Class AB
4. D Class C

Which of the following describes the function of a two-input AND gate?

1. A Output is high when either or both inputs are low
2. B Output is high only when both inputs are high
3. C Output is low when either or both inputs are high
4. D Output is low only when both inputs are high

In a Class A amplifier, what percentage of the time does the amplifying device conduct?

1. A 100%
2. B More than 50% but less than 100%
3. C 50%
4. D Less than 50%

How many states does a 3-bit binary counter have?

1. A 3
2. B 6
3. C 8
4. D 16

What is a shift register?

1. A A clocked array of circuits that passes data in steps along the array
2. B An array of operational amplifiers used for tri-state arithmetic operations
3. C A digital mixer
4. D An analog mixer

Which of the following are basic components of a sine wave oscillator?

1. A An amplifier and a divider
2. B A frequency multiplier and a mixer
3. C A circulator and a filter operating in a feed-forward loop
4. D A filter and an amplifier operating in a feedback loop

How is the efficiency of an RF power amplifier determined?

1. A Divide the DC input power by the DC output power
2. B Divide the RF output power by the DC input power
3. C Multiply the RF input power by the reciprocal of the RF output power
4. D Add the RF input power to the DC output power

What determines the frequency of an LC oscillator?

1. A The number of stages in the counter
2. B The number of stages in the divider
3. C The inductance and capacitance in the tank circuit
4. D The time delay of the lag circuit

Which of the following describes a linear amplifier?

1. A Any RF power amplifier used in conjunction with an amateur transceiver
2. B An amplifier in which the output preserves the input waveform
3. C A Class C high efficiency amplifier
4. D An amplifier used as a frequency multiplier

For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?

1. A SSB
2. B FM
3. C AM
4. D All these choices are correct