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Ham General 2015-2019 > G7 – PRACTICAL CIRCUITS > Flashcards

G7 – PRACTICAL CIRCUITS Flashcards

1
Q

G7A01 (B) What useful feature does a power supply bleeder resistor provide?

A

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

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2
Q

G7A02 (D) Which of the following components are used in a power supply filter network?

A

D. Capacitors and inductors

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3
Q

G7A03 (D) What is the peak-inverse-voltage across the rectifiers in a full-wave bridge power supply?

A

D. Equal to the normal peak output voltage of the power supply

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4
Q

G7A04 (D) What is the peak-inverse-voltage across the rectifier in a half-wave power supply?

A

D. Two times the normal peak output voltage of the power supply

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5
Q

G7A05 (B) What portion of the AC cycle is converted to DC by a half-wave rectifier?

A

B. 180 degrees

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6
Q

G7A06 (D) What portion of the AC cycle is converted to DC by a full-wave rectifier?

A

D. 360 degrees

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7
Q

G7A07 (A) What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

A

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

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8
Q

G7A08(C) Which of the following is an advantage of a switchmode power supply as compared to a linear power supply?

A

C. High frequency operation allows the use of smaller components

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9
Q

G7A09 (C) Which symbol in figure G7-1 represents a field effect transistor?

A

C. Symbol 1

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10
Q

G7A10 (D) Which symbol in figure G7-1 represents a Zener diode?

A

D. Symbol 5

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11
Q

G7A11 (B) Which symbol in figure G7-1 represents an NPN junction transistor?

A

B. Symbol 2

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12
Q

G7A12 (C) Which symbol in Figure G7-1 represents a multiple-winding transformer?

A

C. Symbol 6

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13
Q

G7A13 (A) Which symbol in Figure G7-1 represents a tapped inductor?

A

A. Symbol 7

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14
Q

G7B01 (A)

Complex digital circuitry can often be replaced by what type of integrated circuit?

A

A. Microcontroller

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15
Q

G7B02 (A)

Which of the following is an advantage of using the binary system when processing digital signals?

A

A. Binary “ones” and “zeros” are easy to represent by an “on” or “off” state

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16
Q

G7B03 (B)

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

A

B. Output is high only when both inputs are high

17
Q

G7B04 (C)

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

A

C. Output is low when either or both inputs are high

18
Q

G7B05 (C)

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

A

C. 8

19
Q

G7B06 (A)

What is a shift register?

A

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

20
Q

G7B07 (D)

What are the basic components of virtually all sine wave oscillators?

A

D. A filter and an amplifier operating in a feedback loop

21
Q

G7B08 (B)

How is the efficiency of an RF power amplifier determined?

A

B. Divide the RF output power by the DC input power

22
Q

G7B09 (C)

What determines the frequency of an LC oscillator?

A

C. The inductance and capacitance in the tank circuit

23
Q

G7B10 (D)

Which of the following is a characteristic of a Class A amplifier?

A

D. Low distortion

24
Q

G7B11 (B)

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

A

B. CW

25
Q

G7B12 (D)

Which of these classes of amplifiers has the highest efficiency?

A

D. Class C

26
Q

G7B13 (B)

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

A

B. To eliminate self-oscillations

27
Q

G7B14 (B)

Which of the following describes a linear amplifier?

A

B. An amplifier in which the output preserves the input waveform

28
Q

G7C01 (B)

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

B. Filter

29
Q

G7C02 (D)

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

D. Balanced modulator

30
Q

G7C03 (C)

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

C. Mixer

31
Q

G7C04 (D)

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

D. Product detector

32
Q

G7C05 (D)

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

A

D. Variable frequency with the stability of a crystal oscillator

33
Q

G7C06 (B)

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

B. About the same

34
Q

G7C07 (C)

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

A

C. HF oscillator, mixer, detector

35
Q

G7C08 (D)

What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?

A

D. Discriminator

36
Q

G7C09 (D)

Which of the following is needed for a Digital Signal Processor IF filter?

A

A. An analog to digital converter

B. A digital to analog converter

C. A digital processor chip

D. All of the these choices are correct

37
Q

G7C10 (B)

How is Digital Signal Processor filtering accomplished?

A

B. By converting the signal from analog to digital and using digital processing

38
Q

G7C11 (A)

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

A

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

Ham General 2015-2019 (10 decks)

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