G7 - Practical Circuits1

G7 - PRACTICAL CIRCUITS G7 - PRACTICAL CIRCUITS [3 exam question - 3 groups] [3 exam question - 3 groups]

G7A - Power supplies; schematic symbolsG7A - Power supplies; schematic symbols

G7B - Digital circuits; amplifiers and oscillatorsG7B - Digital circuits; amplifiers and oscillators

G7C - Receivers and transmitters; filters, G7C - Receivers and transmitters; filters, oscillatorsoscillators

G7 - Practical Circuits2

Half Wave Power SupplyHalf Wave Power Supply

Regulated Power SupplyRegulated Power Supply

G7 - Practical Circuits3

The transformer converts 120 volt AC line voltage to 12.6 volts AC. The bridge rectifier feeds pulsed DC into the large capacitor which filters the power to DC. The 7812 voltage regulator takes the DC input and creates a stable 12 volt DC output. The final capacitor removes any ripple from the regulator and stabilizes the output.

G7A01 What safety feature does a power-G7A01 What safety feature does a power-supply bleeder resistor provide?supply bleeder resistor provide?

A. It acts as a fuse for excess voltageA. It acts as a fuse for excess voltage

B. It discharges the filter capacitorsB. It discharges the filter capacitors

C. It removes shock hazards from the induction C. It removes shock hazards from the induction coilscoils

D. It eliminates ground-loop currentD. It eliminates ground-loop current

4 G7 - Practical Circuits

G7A01 What safety feature does a power-G7A01 What safety feature does a power-supply bleeder resistor provide?supply bleeder resistor provide?

A. It acts as a fuse for excess voltageA. It acts as a fuse for excess voltage

B. It discharges the filter capacitorsB. It discharges the filter capacitors

C. It removes shock hazards from the induction C. It removes shock hazards from the induction coilscoils

D. It eliminates ground-loop currentD. It eliminates ground-loop current

5 G7 - Practical Circuits

G7A02 Which of the following G7A02 Which of the following components are used in a power-supply components are used in a power-supply filter network?filter network?

A. DiodesA. Diodes

B. Transformers and transducersB. Transformers and transducers

C. Quartz crystalsC. Quartz crystals

D. Capacitors and inductorsD. Capacitors and inductors

6 G7 - Practical Circuits

G7A02 Which of the following G7A02 Which of the following components are used in a power-supply components are used in a power-supply filter network?filter network?

A. DiodesA. Diodes

B. Transformers and transducersB. Transformers and transducers

C. Quartz crystalsC. Quartz crystals

D. Capacitors and inductorsD. Capacitors and inductors

7 G7 - Practical Circuits

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

A. One-quarter the normal output voltage of A. One-quarter the normal output voltage of the power supplythe power supply

B. Half the normal output voltage of the power B. Half the normal output voltage of the power supplysupply

C. Double the normal peak output voltage of C. Double the normal peak output voltage of the power supplythe power supply

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

8 G7 - Practical Circuits

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

A. One-quarter the normal output voltage of A. One-quarter the normal output voltage of the power supplythe power supply

B. Half the normal output voltage of the power B. Half the normal output voltage of the power supplysupply

C. Double the normal peak output voltage of C. Double the normal peak output voltage of the power supplythe power supply

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

9 G7 - Practical Circuits

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

A. One-half the normal peak output voltage of A. One-half the normal peak output voltage of the power supplythe power supply

B. One-half the normal output voltage of the B. One-half the normal output voltage of the power supplypower supply

C. Equal to the normal output voltage of the C. Equal to the normal output voltage of the power supplypower supply

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

10 G7 - Practical Circuits

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

A. One-half the normal peak output voltage of A. One-half the normal peak output voltage of the power supplythe power supply

B. One-half the normal output voltage of the B. One-half the normal output voltage of the power supplypower supply

C. Equal to the normal output voltage of the C. Equal to the normal output voltage of the power supplypower supply

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

11 G7 - Practical Circuits

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

A. 90 degreesA. 90 degrees

B. 180 degreesB. 180 degrees

C. 270 degreesC. 270 degrees

D. 360 degreesD. 360 degrees

12 G7 - Practical Circuits

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

A. 90 degreesA. 90 degrees

B. 180 degreesB. 180 degrees

C. 270 degreesC. 270 degrees

D. 360 degreesD. 360 degrees

13 G7 - Practical Circuits

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

A. 90 degreesA. 90 degrees

B. 180 degreesB. 180 degrees

C. 270 degreesC. 270 degrees

D. 360 degreesD. 360 degrees

14 G7 - Practical Circuits

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

A. 90 degreesA. 90 degrees

B. 180 degreesB. 180 degrees

C. 270 degreesC. 270 degrees

D. 360 degreesD. 360 degrees

15 G7 - Practical Circuits

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

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

B. A series of DC pulses at the same frequency B. A series of DC pulses at the same frequency as the AC inputas the AC input

C. A sine wave at half the frequency of the AC C. A sine wave at half the frequency of the AC inputinput

D. A steady DC voltageD. A steady DC voltage

16 G7 - Practical Circuits

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

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

B. A series of DC pulses at the same frequency B. A series of DC pulses at the same frequency as the AC inputas the AC input

C. A sine wave at half the frequency of the AC C. A sine wave at half the frequency of the AC inputinput

D. A steady DC voltageD. A steady DC voltage

17 G7 - Practical Circuits

G7A08 Which of the following is an G7A08 Which of the following is an advantage of a switch-mode power supply advantage of a switch-mode power supply as compared to a linear power supply?as compared to a linear power supply?

A. Faster switching time makes higher output A. Faster switching time makes higher output voltage possiblevoltage possible

B. Fewer circuit components are requiredB. Fewer circuit components are required

C. High frequency operation allows the use of C. High frequency operation allows the use of smaller componentssmaller components

D. All of these choices are correctD. All of these choices are correct

18 G7 - Practical Circuits

G7A08 Which of the following is an G7A08 Which of the following is an advantage of a switch-mode power supply advantage of a switch-mode power supply as compared to a linear power supply?as compared to a linear power supply?

A. Faster switching time makes higher output A. Faster switching time makes higher output voltage possiblevoltage possible

B. Fewer circuit components are requiredB. Fewer circuit components are required

C. High frequency operation allows the use C. High frequency operation allows the use of smaller componentsof smaller components

D. All of these choices are correctD. All of these choices are correct

19 G7 - Practical Circuits

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

A. Symbol 2A. Symbol 2

B. Symbol 5B. Symbol 5

C. Symbol 1C. Symbol 1

D. Symbol 4D. Symbol 4

20 G7 - Practical Circuits

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

A. Symbol 2A. Symbol 2

B. Symbol 5B. Symbol 5

C. Symbol 1C. Symbol 1

D. Symbol 4D. Symbol 4

21 G7 - Practical Circuits

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

A. Symbol 4A. Symbol 4

B. Symbol 1B. Symbol 1

C. Symbol 11C. Symbol 11

D. Symbol 5D. Symbol 5

22 G7 - Practical Circuits

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

A. Symbol 4A. Symbol 4

B. Symbol 1B. Symbol 1

C. Symbol 11C. Symbol 11

D. Symbol 5D. Symbol 5

23 G7 - Practical Circuits

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

A. Symbol 1A. Symbol 1

B. Symbol 2B. Symbol 2

C. Symbol 7C. Symbol 7

D. Symbol 11D. Symbol 11

24 G7 - Practical Circuits

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

A. Symbol 1A. Symbol 1

B. Symbol 2B. Symbol 2

C. Symbol 7C. Symbol 7

D. Symbol 11D. Symbol 11

25 G7 - Practical Circuits

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

A. Symbol 4A. Symbol 4

B. Symbol 7B. Symbol 7

C. Symbol 6C. Symbol 6

D. Symbol 1D. Symbol 1

26 G7 - Practical Circuits

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

A. Symbol 4A. Symbol 4

B. Symbol 7B. Symbol 7

C. Symbol 6C. Symbol 6

D. Symbol 1D. Symbol 1

27 G7 - Practical Circuits

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

A. Symbol 7A. Symbol 7

B. Symbol 11B. Symbol 11

C. Symbol 6C. Symbol 6

D. Symbol 1D. Symbol 1

28 G7 - Practical Circuits

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

A. Symbol 7A. Symbol 7

B. Symbol 11B. Symbol 11

C. Symbol 6C. Symbol 6

D. Symbol 1D. Symbol 1

29 G7 - Practical Circuits

G7 - Practical Circuits30

Digital GatesDigital Gates

A B Q

0 0 1

0 1 1

1 0 1

1 1 0

A B Q

0 0 0

0 1 0

1 0 0

1 1 1

ANDAND NANDNAND

A B Q

0 0 1

0 1 0

1 0 0

1 1 0

A B Q

0 0 0

0 1 1

1 0 1

1 1 1

OROR NORNOR

A and B are inputs to the gates with Q being the output value.

Notice the NAND and NOR gates are exactly the opposite of their counterparts. The AND or OR function is performed and the result is inverted or NOTed.

G7B01 Complex digital circuitry can often G7B01 Complex digital circuitry can often be replaced by what type of integrated be replaced by what type of integrated circuit?circuit?

A. MicrocontrollerA. Microcontroller

B. Charge-coupled deviceB. Charge-coupled device

C. Phase detectorC. Phase detector

D. Window comparatorD. Window comparator

31 G7 - Practical Circuits

G7B01 Complex digital circuitry can often G7B01 Complex digital circuitry can often be replaced by what type of integrated be replaced by what type of integrated circuit?circuit?

A. MicrocontrollerA. Microcontroller

B. Charge-coupled deviceB. Charge-coupled device

C. Phase detectorC. Phase detector

D. Window comparatorD. Window comparator

32 G7 - Practical Circuits

G7B02 Which of the following is an G7B02 Which of the following is an advantage of using the binary system advantage of using the binary system when processing digital signals?when processing digital signals?

A. Binary "ones" and "zeros" are easy to A. Binary "ones" and "zeros" are easy to represent with an "on" or "off" staterepresent with an "on" or "off" state

B. The binary number system is most accurateB. The binary number system is most accurate

C. Binary numbers are more compatible with C. Binary numbers are more compatible with analog circuitryanalog circuitry

D. All of these choices are correctD. All of these choices are correct

33 G7 - Practical Circuits

G7B02 Which of the following is an G7B02 Which of the following is an advantage of using the binary system advantage of using the binary system when processing digital signals?when processing digital signals?

A. Binary "ones" and "zeros" are easy to A. Binary "ones" and "zeros" are easy to represent with an "on" or "off" staterepresent with an "on" or "off" state

B. The binary number system is most accurateB. The binary number system is most accurate

C. Binary numbers are more compatible with C. Binary numbers are more compatible with analog circuitryanalog circuitry

D. All of these choices are correctD. All of these choices are correct

34 G7 - Practical Circuits

G7B03 Which of the following describes G7B03 Which of the following describes the function of a two input AND gate?the function of a two input AND gate?

A. Output is high when either or both inputs A. Output is high when either or both inputs are loware low

B. Output is high only when both inputs are B. Output is high only when both inputs are highhigh

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

D. Output is low only when both inputs are highD. Output is low only when both inputs are high

35 G7 - Practical Circuits

G7B03 Which of the following describes G7B03 Which of the following describes the function of a two input AND gate?the function of a two input AND gate?

A. Output is high when either or both inputs A. Output is high when either or both inputs are loware low

B. Output is high only when both inputs are B. Output is high only when both inputs are highhigh

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

D. Output is low only when both inputs are highD. Output is low only when both inputs are high

36 G7 - Practical Circuits

G7B04 Which of the following describes G7B04 Which of the following describes the function of a two input NOR gate?the function of a two input NOR gate?

A. Output is high when either or both inputs A. Output is high when either or both inputs are loware low

B. Output is high only when both inputs are B. Output is high only when both inputs are highhigh

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

D. Output is low only when both inputs are highD. Output is low only when both inputs are high

37 G7 - Practical Circuits

G7B04 Which of the following describes G7B04 Which of the following describes the function of a two input NOR gate?the function of a two input NOR gate?

A. Output is high when either or both inputs A. Output is high when either or both inputs are loware low

B. Output is high only when both inputs are B. Output is high only when both inputs are highhigh

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

D. Output is low only when both inputs are highD. Output is low only when both inputs are high

38 G7 - Practical Circuits

G7B05 How many states does a 3-bit G7B05 How many states does a 3-bit binary counter have?binary counter have?

A. 3A. 3

B. 6B. 6

C. 8C. 8

D. 16D. 16

39 G7 - Practical Circuits

G7B05 How many states does a 3-bit G7B05 How many states does a 3-bit binary counter have?binary counter have?

A. 3A. 3

B. 6B. 6

C. 8C. 8

D. 16D. 16

40 G7 - Practical Circuits

G7B06 What is a shift register?G7B06 What is a shift register?

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

B. An array of operational amplifiers used for B. An array of operational amplifiers used for tri state arithmetic operationstri state arithmetic operations

C. A digital mixerC. A digital mixer

D. An analog mixerD. An analog mixer

41 G7 - Practical Circuits

G7B06 What is a shift register?G7B06 What is a shift register?

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

B. An array of operational amplifiers used for B. An array of operational amplifiers used for tri state arithmetic operationstri state arithmetic operations

C. A digital mixerC. A digital mixer

D. An analog mixerD. An analog mixer

42 G7 - Practical Circuits

G7B07 What are the basic components of G7B07 What are the basic components of virtually all sine wave oscillators?virtually all sine wave oscillators?

A. An amplifier and a dividerA. An amplifier and a divider

B. A frequency multiplier and a mixerB. A frequency multiplier and a mixer

C. A circulator and a filter operating in a feed-C. A circulator and a filter operating in a feed-forward loopforward loop

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

43 G7 - Practical Circuits

G7B07 What are the basic components of G7B07 What are the basic components of virtually all sine wave oscillators?virtually all sine wave oscillators?

A. An amplifier and a dividerA. An amplifier and a divider

B. A frequency multiplier and a mixerB. A frequency multiplier and a mixer

C. A circulator and a filter operating in a feed-C. A circulator and a filter operating in a feed-forward loopforward loop

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

44 G7 - Practical Circuits

G7B08 How is the efficiency of an RF G7B08 How is the efficiency of an RF power amplifier determined?power amplifier determined?

A. Divide the DC input power by the DC output A. Divide the DC input power by the DC output powerpower

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

C. Multiply the RF input power by the reciprocal C. Multiply the RF input power by the reciprocal of the RF output powerof the RF output power

D. Add the RF input power to the DC output D. Add the RF input power to the DC output powerpower

45 G7 - Practical Circuits

G7B08 How is the efficiency of an RF G7B08 How is the efficiency of an RF power amplifier determined?power amplifier determined?

A. Divide the DC input power by the DC output A. Divide the DC input power by the DC output powerpower

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

C. Multiply the RF input power by the reciprocal C. Multiply the RF input power by the reciprocal of the RF output powerof the RF output power

D. Add the RF input power to the DC output D. Add the RF input power to the DC output powerpower

46 G7 - Practical Circuits

G7B09 What determines the frequency of G7B09 What determines the frequency of an LC oscillator?an LC oscillator?

A. The number of stages in the counterA. The number of stages in the counter

B. The number of stages in the dividerB. The number of stages in the divider

C. The inductance and capacitance in the tank C. The inductance and capacitance in the tank circuitcircuit

D. The time delay of the lag circuitD. The time delay of the lag circuit

47 G7 - Practical Circuits

G7B09 What determines the frequency of G7B09 What determines the frequency of an LC oscillator?an LC oscillator?

A. The number of stages in the counterA. The number of stages in the counter

B. The number of stages in the dividerB. The number of stages in the divider

C. The inductance and capacitance in the C. The inductance and capacitance in the tank circuittank circuit

D. The time delay of the lag circuitD. The time delay of the lag circuit

48 G7 - Practical Circuits

G7B10 Which of the following is a G7B10 Which of the following is a characteristic of a Class A amplifier?characteristic of a Class A amplifier?

A. Low standby powerA. Low standby power

B. High EfficiencyB. High Efficiency

C. No need for biasC. No need for bias

D. Low distortionD. Low distortion

49 G7 - Practical Circuits

G7B10 Which of the following is a G7B10 Which of the following is a characteristic of a Class A amplifier?characteristic of a Class A amplifier?

A. Low standby powerA. Low standby power

B. High EfficiencyB. High Efficiency

C. No need for biasC. No need for bias

D. Low distortionD. Low distortion

50 G7 - Practical Circuits

G7B11 For which of the following modes G7B11 For which of the following modes is a Class C power stage appropriate for is a Class C power stage appropriate for amplifying a modulated signal?amplifying a modulated signal?

A. SSBA. SSB

B. CWB. CW

C. AMC. AM

D. All of these choices are correctD. All of these choices are correct

51 G7 - Practical Circuits

G7B11 For which of the following modes G7B11 For which of the following modes is a Class C power stage appropriate for is a Class C power stage appropriate for amplifying a modulated signal?amplifying a modulated signal?

A. SSBA. SSB

B. CWB. CW

C. AMC. AM

D. All of these choices are correctD. All of these choices are correct

52 G7 - Practical Circuits

G7B12 Which of these classes of G7B12 Which of these classes of amplifiers has the highest efficiency?amplifiers has the highest efficiency?

A. Class AA. Class A

B. Class BB. Class B

C. Class ABC. Class AB

D. Class CD. Class C

53 G7 - Practical Circuits

G7B12 Which of these classes of G7B12 Which of these classes of amplifiers has the highest efficiency?amplifiers has the highest efficiency?

A. Class AA. Class A

B. Class BB. Class B

C. Class ABC. Class AB

D. Class CD. Class C

54 G7 - Practical Circuits

G7B13 What is the reason for neutralizing G7B13 What is the reason for neutralizing the final amplifier stage of a transmitter?the final amplifier stage of a transmitter?

A. To limit the modulation indexA. To limit the modulation index

B. To eliminate self-oscillationsB. To eliminate self-oscillations

C. To cut off the final amplifier during standby C. To cut off the final amplifier during standby periodsperiods

D. To keep the carrier on frequencyD. To keep the carrier on frequency

55 G7 - Practical Circuits

G7B13 What is the reason for neutralizing G7B13 What is the reason for neutralizing the final amplifier stage of a transmitter?the final amplifier stage of a transmitter?

A. To limit the modulation indexA. To limit the modulation index

B. To eliminate self-oscillationsB. To eliminate self-oscillations

C. To cut off the final amplifier during standby C. To cut off the final amplifier during standby periodsperiods

D. To keep the carrier on frequencyD. To keep the carrier on frequency

56 G7 - Practical Circuits

G7B14 Which of the following describes a G7B14 Which of the following describes a linear amplifier?linear amplifier?

A. Any RF power amplifier used in conjunction A. Any RF power amplifier used in conjunction with an amateur transceiverwith an amateur transceiver

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

C. A Class C high efficiency amplifierC. A Class C high efficiency amplifier

D. An amplifier used as a frequency multiplierD. An amplifier used as a frequency multiplier

57 G7 - Practical Circuits

G7B14 Which of the following describes a G7B14 Which of the following describes a linear amplifier?linear amplifier?

A. Any RF power amplifier used in conjunction A. Any RF power amplifier used in conjunction with an amateur transceiverwith an amateur transceiver

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

C. A Class C high efficiency amplifierC. A Class C high efficiency amplifier

D. An amplifier used as a frequency multiplierD. An amplifier used as a frequency multiplier

58 G7 - Practical Circuits

Simple Single-Sideband Phone Simple Single-Sideband Phone TransmitterTransmitter

G7 - Practical Circuits59

SpeechAmp

BalancedModulator

Filter

Filter

Mixer

Linear RF Amp

Carrier Oscillator

Heterodyne Oscillator

The microphone audio is modulated into AM by mixing with the carrier oscillator in the balanced modulator. The filter removes the unwanted products before mixing again to create the signal on the desired frequency. That final signal is amplified and sent to the antenna.

G7C01 Which of the following is used to G7C01 Which of the following is used to process signals from the balanced process signals from the balanced modulator and send them to the mixer in modulator and send them to the mixer in a single-sideband phone transmitter?a single-sideband phone transmitter?

A. Carrier oscillatorA. Carrier oscillator

B. FilterB. Filter

C. IF amplifierC. IF amplifier

D. RF amplifierD. RF amplifier

60 G7 - Practical Circuits

G7C01 Which of the following is used to G7C01 Which of the following is used to process signals from the balanced process signals from the balanced modulator and send them to the mixer in modulator and send them to the mixer in a single-sideband phone transmitter?a single-sideband phone transmitter?

A. Carrier oscillatorA. Carrier oscillator

B. FilterB. Filter

C. IF amplifierC. IF amplifier

D. RF amplifierD. RF amplifier

61 G7 - Practical Circuits

G7C02 Which circuit is used to combine G7C02 Which circuit is used to combine signals from the carrier oscillator and signals from the carrier oscillator and speech amplifier and send the result to speech amplifier and send the result to the filter in a typical single-sideband the filter in a typical single-sideband phone transmitter?phone transmitter?

A. DiscriminatorA. Discriminator

B. DetectorB. Detector

C. IF amplifierC. IF amplifier

D. Balanced modulatorD. Balanced modulator

62 G7 - Practical Circuits

G7C02 Which circuit is used to combine G7C02 Which circuit is used to combine signals from the carrier oscillator and signals from the carrier oscillator and speech amplifier and send the result to speech amplifier and send the result to the filter in a typical single-sideband the filter in a typical single-sideband phone transmitter?phone transmitter?

A. DiscriminatorA. Discriminator

B. DetectorB. Detector

C. IF amplifierC. IF amplifier

D. Balanced modulatorD. Balanced modulator

63 G7 - Practical Circuits

G7C03 What circuit is used to process G7C03 What circuit is used to process signals from the RF amplifier and local signals from the RF amplifier and local oscillator and send the result to the IF oscillator and send the result to the IF filter in a superheterodyne receiver?filter in a superheterodyne receiver?

A. Balanced modulatorA. Balanced modulator

B. IF amplifierB. IF amplifier

C. MixerC. Mixer

D. DetectorD. Detector

64 G7 - Practical Circuits

G7C03 What circuit is used to process G7C03 What circuit is used to process signals from the RF amplifier and local signals from the RF amplifier and local oscillator and send the result to the IF oscillator and send the result to the IF filter in a superheterodyne receiver?filter in a superheterodyne receiver?

A. Balanced modulatorA. Balanced modulator

B. IF amplifierB. IF amplifier

C. MixerC. Mixer

D. DetectorD. Detector

65 G7 - Practical Circuits

G7C04 What circuit is used to combine G7C04 What circuit is used to combine signals from the IF amplifier and BFO and signals from the IF amplifier and BFO and send the result to the AF amplifier in a send the result to the AF amplifier in a single-sideband receiver?single-sideband receiver?

A. RF oscillatorA. RF oscillator

B. IF filterB. IF filter

C. Balanced modulatorC. Balanced modulator

D. Product detectorD. Product detector

66 G7 - Practical Circuits

G7C04 What circuit is used to combine G7C04 What circuit is used to combine signals from the IF amplifier and BFO and signals from the IF amplifier and BFO and send the result to the AF amplifier in a send the result to the AF amplifier in a single-sideband receiver?single-sideband receiver?

A. RF oscillatorA. RF oscillator

B. IF filterB. IF filter

C. Balanced modulatorC. Balanced modulator

D. Product detectorD. Product detector

67 G7 - Practical Circuits

G7C05 Which of the following is an G7C05 Which of the following is an advantage of a transceiver controlled by advantage of a transceiver controlled by a direct digital synthesizer (DDS)?a direct digital synthesizer (DDS)?

A. Wide tuning range and no need for band A. Wide tuning range and no need for band switchingswitching

B. Relatively high power outputB. Relatively high power output

C. Relatively low power consumptionC. Relatively low power consumption

D. Variable frequency with the stability of a D. Variable frequency with the stability of a crystal oscillatorcrystal oscillator

68 G7 - Practical Circuits

G7C05 Which of the following is an G7C05 Which of the following is an advantage of a transceiver controlled by advantage of a transceiver controlled by a direct digital synthesizer (DDS)?a direct digital synthesizer (DDS)?

A. Wide tuning range and no need for band A. Wide tuning range and no need for band switchingswitching

B. Relatively high power outputB. Relatively high power output

C. Relatively low power consumptionC. Relatively low power consumption

D. Variable frequency with the stability of a D. Variable frequency with the stability of a crystal oscillatorcrystal oscillator

69 G7 - Practical Circuits

G7C06 What should be the impedance of G7C06 What should be the impedance of a low-pass filter as compared to the a low-pass filter as compared to the impedance of the transmission line into impedance of the transmission line into which it is inserted?which it is inserted?

A. Substantially higherA. Substantially higher

B. About the sameB. About the same

C. Substantially lowerC. Substantially lower

D. Twice the transmission line impedanceD. Twice the transmission line impedance

70 G7 - Practical Circuits

G7C06 What should be the impedance of G7C06 What should be the impedance of a low-pass filter as compared to the a low-pass filter as compared to the impedance of the transmission line into impedance of the transmission line into which it is inserted?which it is inserted?

A. Substantially higherA. Substantially higher

B. About the sameB. About the same

C. Substantially lowerC. Substantially lower

D. Twice the transmission line impedanceD. Twice the transmission line impedance

71 G7 - Practical Circuits

G7C07 What is the simplest combination G7C07 What is the simplest combination of stages that implement a of stages that implement a superheterodyne receiver?superheterodyne receiver?

A. RF amplifier, detector, audio amplifierA. RF amplifier, detector, audio amplifier

B. RF amplifier, mixer, IF discriminatorB. RF amplifier, mixer, IF discriminator

C. HF oscillator, mixer, detectorC. HF oscillator, mixer, detector

D. HF oscillator, pre-scaler, audio amplifierD. HF oscillator, pre-scaler, audio amplifier

72 G7 - Practical Circuits

G7C07 What is the simplest combination G7C07 What is the simplest combination of stages that implement a of stages that implement a superheterodyne receiver?superheterodyne receiver?

A. RF amplifier, detector, audio amplifierA. RF amplifier, detector, audio amplifier

B. RF amplifier, mixer, IF discriminatorB. RF amplifier, mixer, IF discriminator

C. HF oscillator, mixer, detectorC. HF oscillator, mixer, detector

D. HF oscillator, pre-scaler, audio amplifierD. HF oscillator, pre-scaler, audio amplifier

73 G7 - Practical Circuits

G7C08 What type of circuit is used in G7C08 What type of circuit is used in many FM receivers to convert signals many FM receivers to convert signals coming from the IF amplifier to audio?coming from the IF amplifier to audio?

A. Product detectorA. Product detector

B. Phase inverterB. Phase inverter

C. MixerC. Mixer

D. DiscriminatorD. Discriminator

74 G7 - Practical Circuits

G7C08 What type of circuit is used in G7C08 What type of circuit is used in many FM receivers to convert signals many FM receivers to convert signals coming from the IF amplifier to audio?coming from the IF amplifier to audio?

A. Product detectorA. Product detector

B. Phase inverterB. Phase inverter

C. MixerC. Mixer

D. DiscriminatorD. Discriminator

75 G7 - Practical Circuits

G7C09 Which of the following is needed G7C09 Which of the following is needed for a Digital Signal Processor IF filter?for a Digital Signal Processor IF filter?

A. An analog to digital converterA. An analog to digital converter

B. A digital to analog converterB. A digital to analog converter

C. A digital processor chipC. A digital processor chip

D. All of the these choices are correctD. All of the these choices are correct

76 G7 - Practical Circuits

G7C09 Which of the following is needed G7C09 Which of the following is needed for a Digital Signal Processor IF filter?for a Digital Signal Processor IF filter?

A. An analog to digital converterA. An analog to digital converter

B. A digital to analog converterB. A digital to analog converter

C. A digital processor chipC. A digital processor chip

D. All of the these choices are correctD. All of the these choices are correct

77 G7 - Practical Circuits

G7C10 How is Digital Signal Processor G7C10 How is Digital Signal Processor filtering accomplished? filtering accomplished?

A. By using direct signal phasingA. By using direct signal phasing

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

C. By differential spurious phasingC. By differential spurious phasing

D. By converting the signal from digital to D. By converting the signal from digital to analog and taking the difference of mixing analog and taking the difference of mixing productsproducts

78 G7 - Practical Circuits

G7C10 How is Digital Signal Processor G7C10 How is Digital Signal Processor filtering accomplished? filtering accomplished?

A. By using direct signal phasingA. By using direct signal phasing

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

C. By differential spurious phasingC. By differential spurious phasing

D. By converting the signal from digital to D. By converting the signal from digital to analog and taking the difference of mixing analog and taking the difference of mixing productsproducts

79 G7 - Practical Circuits

G7C11 What is meant by the term G7C11 What is meant by the term "software defined radio" (SDR)?"software defined radio" (SDR)?

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

B. A radio which provides computer interface for B. A radio which provides computer interface for automatic logging of band and frequencyautomatic logging of band and frequency

C. A radio which uses crystal filters designed C. A radio which uses crystal filters designed using softwareusing software

D. A computer model which can simulate D. A computer model which can simulate performance of a radio to aid in the design performance of a radio to aid in the design processprocess

80 G7 - Practical Circuits

G7C11 What is meant by the term G7C11 What is meant by the term "software defined radio" (SDR)?"software defined radio" (SDR)?

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

B. A radio which provides computer interface for B. A radio which provides computer interface for automatic logging of band and frequencyautomatic logging of band and frequency

C. A radio which uses crystal filters designed using C. A radio which uses crystal filters designed using softwaresoftware

D. A computer model which can simulate D. A computer model which can simulate performance of a radio to aid in the design performance of a radio to aid in the design processprocess

81 G7 - Practical Circuits

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G7 - PRACTICAL CIRCUITS G7 - PRACTICAL CIRCUITS [3 exam question - 3 groups][3 exam question - 3 groups]