G7B01:

What is the reason for neutralizing the final amplifier stage of a transmitter?

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

G7B02:

Which of these classes of amplifiers has the highest efficiency?

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

G7B03:

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

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

G7B04:

Which of the following describes the function of a two input NOR gate?

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

G7B05:

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

1. 3
2. 6
3. 8
4. 16

G7B06:

What is a shift register?

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

G7B07:

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

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

G7B08:

How is the efficiency of an RF power amplifier determined?

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

G7B09:

What determines the frequency of an LC oscillator?

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

G7B10:

Which of the following describes a linear amplifier?

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

G7B11:

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

1. SSB
2. FM
3. AM
4. All these choices are correct