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General License Ham Radio > Sub Element G7: Practical Circuits > Flashcards

Sub Element G7: Practical Circuits Flashcards

1
Q

What useful feature does a power supply bleeder resistor provide?

A

It ensures that the filter capacitors are discharged when power is removed

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2
Q

Which of the following components are used in a power supply filter network?

A

Capacitors and inductors

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3
Q

Which type of rectifier circuit uses two diodes and a center-tapped transformer?

A

Full-wave

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4
Q

What is an advantage of a half-wave rectifier in a power supply?

A

Only one diode is required

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5
Q

What portion of the AC cycle is converted to DC by a half-wave rectifier?

A

180 degrees

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6
Q

What portion of the AC cycle is converted to DC by a full-wave rectifier?

A

360 degrees

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7
Q

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

A

A series of DC pulses at twice the frequency of the AC input

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8
Q

Which of the following is an advantage of a switch mode power supply as compared to a linear power supply?

A

High-frequency operation allows the use of smaller components

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9
Q

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

A

To eliminate self-oscillations

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10
Q

Which of these classes of amplifiers has the highest efficiency?

A

Class C

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11
Q

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

A

Output is high only when both inputs are high

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12
Q

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

A

Output is low when either or both inputs are high

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13
Q

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

A

8

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14
Q

What is a shift register?

A

A clocked array of circuits that passes data in steps along the array

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15
Q

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

A

A filter and an amplifier operating in a feedback loop

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16
Q

How is the efficiency of an RF power amplifier determined?

A

Divide the RF output power by the DC input power

17
Q

What determines the frequency of an LC oscillator?

A

The inductance and capacitance in the tank circuit

18
Q

Which of the following describes a linear amplifier?

A

An amplifier in which the output preserves the input waveform

19
Q

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

A

FM

20
Q

Which of the following is used to process signals from the balanced modulator then send them to the mixer in some single sideband phone transmitters?

A

Filter

21
Q

Which circuit is used to combine signals from the carrier oscillator and speech amplifier then send the result to the filter in some single sideband phone transmitters?

A

Balanced modulator

22
Q

What circuit is used to process signals from the RF amplifier and local oscillator then send the result to the IF filter in a superheterodyne receiver?

A

Mixer

23
Q

What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in some single sideband receivers?

A

Product detector

24
Q

Which of the following is an advantage of a direct digital synthesizer (DDS)?

A

Variable frequency with the stability of a crystal oscillator

25
Q

What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?

A

About the same

26
Q

What is the simplest combination of stages that implement a superheterodyne receiver?

A

HF oscillator, mixer, detector

27
Q

What circuit is used in analog FM receivers to convert IF output signals to audio?

A

Discriminator

28
Q

What is the phase difference between the I and Q signals that software-defined radio (SDR) equipment uses for modulation and demodulation?

A

90 degrees

29
Q

What is an advantage of using I and Q signals in software-defined radios (SDRs)?

A

All types of modulation can be created with appropriate processing.

30
Q

What is meant by the term “software-defined radio” (SDR)?

A

A radio in which most major signal processing functions are performed by software

31
Q

What is the frequency above which a low-pass filter’s output power is less than half the input power?

A

Cutoff frequency

32
Q

What term specifies a filter’s maximum ability to reject signals outside its passband?

A

Ultimate rejection

33
Q

The bandwidth of a band-pass filter is measured between what two frequencies?

A

Upper and lower half-power

34
Q

What term specifies a filter’s attenuation inside its passband?

A

Insertion loss

35
Q

Which of the following is a typical application for a Direct Digital Synthesizer?

A

A high-stability variable frequency oscillator in a transceiver

General License Ham Radio (10 decks)

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