Question 1

A receiver's sensitivity is:

Accepted Answer

A)  its ability to drive the output speaker to an acceptable level. 
B)  the extent to which a receiver is capable of differentiating between the desired signal and other signals. 
C)  the ability of the receiver to demodulate a modulated signal. 
D)  the ability of a receiver to attenuate noise signals. 
A)  its ability to drive the output speaker to an acceptable level. 
B)  the extent to which a receiver is capable of differentiating between the desired signal and other signals. 
C)  the ability of the receiver to demodulate a modulated signal. 
D)  the ability of a receiver to attenuate noise signals. A

Question 2

If a receiver is overly selective:

Accepted Answer

A)  the volume control is turned up to maximum, the desired station is very weak. 
B)  only part of the bandwidth of the AM signal is amplified, causing some of the sideband information to be lost and distortion results. 
C)  too much noise is picked up and amplified by the receiver. 
D)  the tank circuits within the tuned amplifiers have insufficient Q. 
A)  the volume control is turned up to maximum, the desired station is very weak. 
B)  only part of the bandwidth of the AM signal is amplified, causing some of the sideband information to be lost and distortion results. 
C)  too much noise is picked up and amplified by the receiver. 
D)  the tank circuits within the tuned amplifiers have insufficient Q. B

Question 3

In a varactor diode, as voltage increases, capacitance:

Accepted Answer

A)  decreases 
B)  increases 
C)  stays the same 
D)  none of the above 
A)  decreases 
B)  increases 
C)  stays the same 
D)  none of the above A

Question 4

A trimmer capacitor:

Accepted Answer

A)  is placed in an RF amplifier to provide for proper neutralization. 
B)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band. 
C)  is placed in a tank circuit to provide for electronic tuning. 
D)  is placed in parallel with each section of the ganged capacitor of the tank to provide tracking at the high end of a large frequency band. 
A)  is placed in an RF amplifier to provide for proper neutralization. 
B)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band. 
C)  is placed in a tank circuit to provide for electronic tuning. 
D)  is placed in parallel with each section of the ganged capacitor of the tank to provide tracking at the high end of a large frequency band.

Question 5

If a receiver is underselective:

Accepted Answer

A)  more than one radio station on different frequencies may be picked up by the receiver at the same time 
B)  only part of the bandwidth of the AM signal is amplified, causing some of the sideband information to be lost and distortion results. 
C)  when the volume control is turned up to maximum, the desired station is very weak. 
D)  the tank circuits within the tuned amplifiers have too high a Q. 
A)  more than one radio station on different frequencies may be picked up by the receiver at the same time 
B)  only part of the bandwidth of the AM signal is amplified, causing some of the sideband information to be lost and distortion results. 
C)  when the volume control is turned up to maximum, the desired station is very weak. 
D)  the tank circuits within the tuned amplifiers have too high a Q.

Question 6

A padder capacitor:

Accepted Answer

A)  is placed in an RF amplifier to provide for proper neutralization. 
B)  is placed in a tank circuit to provide for electronic tuning. 
C)  is placed in parallel with each section of the ganged capacitors of the tank to provide tracking at the high end of a large frequency band. 
D)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band. 
A)  is placed in an RF amplifier to provide for proper neutralization. 
B)  is placed in a tank circuit to provide for electronic tuning. 
C)  is placed in parallel with each section of the ganged capacitors of the tank to provide tracking at the high end of a large frequency band. 
D)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band.

Question 7

The only roadblock to having complete receivers on a chip aside from station selection and volume controls is:

Accepted Answer

A)  IF amplifier. 
B)  limiting factors of tuned circuits. 
C)  local oscillator. 
D)  mixer circuits. 
A)  IF amplifier. 
B)  limiting factors of tuned circuits. 
C)  local oscillator. 
D)  mixer circuits.

Question 8

Image frequency rejection on a standard AM broadcast band receiver is not a major problem since:

Accepted Answer

A)  the image frequency is not close to the IF frequency 
B)  the image frequency is so far away from the RF amplifier stage's tuned frequency 
C)  the image frequency is not produced by mixing action 
D)  the image frequency is not close to the LO frequency 
A)  the image frequency is not close to the IF frequency 
B)  the image frequency is so far away from the RF amplifier stage's tuned frequency 
C)  the image frequency is not produced by mixing action 
D)  the image frequency is not close to the LO frequency

Question 9

The diode detector:

Accepted Answer

A)  one of the simplest and most effective AM detectors 
B)  is sometimes referred to as an envelope detector 
C)  consists of a nonlinear diode and low-pass filter 
D)  all of the above 
A)  one of the simplest and most effective AM detectors 
B)  is sometimes referred to as an envelope detector 
C)  consists of a nonlinear diode and low-pass filter 
D)  all of the above

Question 10

A receiver's selectivity is:

Accepted Answer

A)  the ability of a receiver to attenuate noise signals. 
B)  the extent to which a receiver is capable of differentiating between the desired signal and other signals. 
C)  its ability to drive the output speaker to an acceptable level. 
D)  the ability of the receiver to demodulate a modulated signal. 
A)  the ability of a receiver to attenuate noise signals. 
B)  the extent to which a receiver is capable of differentiating between the desired signal and other signals. 
C)  its ability to drive the output speaker to an acceptable level. 
D)  the ability of the receiver to demodulate a modulated signal.

Question 11

Good troubleshooting practice says:

Accepted Answer

A)  check the power supply voltages 
B)  prepare a trouble report 
C)  log the serial and model number 
D)  perform a visual check and check the power supply voltages 
E)  none of the above 
A)  check the power supply voltages 
B)  prepare a trouble report 
C)  log the serial and model number 
D)  perform a visual check and check the power supply voltages 
E)  none of the above

Question 12

An AM signal having a carrier frequency of 560 kHz is to be mixed with a local oscillator signal at a frequency of 1035 kHz. What does the output of the IF amplifier consist of?

Accepted Answer

A)  a 475 kHz sinewave 
B)  the original intelligence signal 
C)  a 455 kHz carrier 
D)  a 475 kHz AM signal 
A)  a 475 kHz sinewave 
B)  the original intelligence signal 
C)  a 455 kHz carrier 
D)  a 475 kHz AM signal

Question 13

Diagonal clipping:

Accepted Answer

A)  is characterized by having the capacitor voltage not follow the full changes of the envelope of the AM waveform. 
B)  occurs if the time constant of the low-pass filter is too large compared to the period of the RF waveform. 
C)  is a type of distortion that occurs with diode detectors. 
D)  all of the above 
A)  is characterized by having the capacitor voltage not follow the full changes of the envelope of the AM waveform. 
B)  occurs if the time constant of the low-pass filter is too large compared to the period of the RF waveform. 
C)  is a type of distortion that occurs with diode detectors. 
D)  all of the above

Question 14

A receiver has a maximum input signal of 75 mW before distortion occurs. Its sensitivity is measured to be 1.5 nW. Its dynamic range is approximately:

Accepted Answer

A)  47 dB 
B)  77 dB 
C)  87 dB 
D)  154 dB 
A)  47 dB 
B)  77 dB 
C)  87 dB 
D)  154 dB

Question 15

A varicap:

Accepted Answer

A)  is placed in a tank circuit to provide for electronic tuning. 
B)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band. 
C)  is placed in parallel with each section of the ganged capacitors of the tank to provide tracking at the high end of a large frequency band. 
D)  is placed in an RF amplifier to provide for proper neutralization. 
A)  is placed in a tank circuit to provide for electronic tuning. 
B)  is placed in series with the tank inductor to provide tracking at the low end of a large frequency band. 
C)  is placed in parallel with each section of the ganged capacitors of the tank to provide tracking at the high end of a large frequency band. 
D)  is placed in an RF amplifier to provide for proper neutralization.

Question 16

The superheterodyne receiver design is superior to the TRF design:

Accepted Answer

A)  since it uses many RF amplifier stages before the RF signal is mixed with the local oscillator signal. 
B)  since it allows for a constant selectivity over the entire tuning range of the receiver. 
C)  since it always uses synchronous detectors instead of diode detectors. 
D)  all of the above 
A)  since it uses many RF amplifier stages before the RF signal is mixed with the local oscillator signal. 
B)  since it allows for a constant selectivity over the entire tuning range of the receiver. 
C)  since it always uses synchronous detectors instead of diode detectors. 
D)  all of the above

Question 17

An autodyne mixer is:

Accepted Answer

A)  stage that mixes the LO with the AM signal without the use of a transistor. 
B)  mixer that uses a dual-gate FET. 
C)  stage that provides the mixing and generates the LO at the same time. 
D)  mixer that automatically provides for AGC action. 
A)  stage that mixes the LO with the AM signal without the use of a transistor. 
B)  mixer that uses a dual-gate FET. 
C)  stage that provides the mixing and generates the LO at the same time. 
D)  mixer that automatically provides for AGC action.

Question 18

A TRF receiver is to be designed with a single tuned circuit using an 8.2 uH inductor. If the frequency is to be tuned from 55 kHz to 1600 kHz, find the BW that results at 550 kHz if there is exactly 10 kHz BW at a frequency of 1050 kHz

Accepted Answer

A)  10 kHz 
B)  15.24 kHz 
C)  105 kHz 
D)  5.24 kHz 
A)  10 kHz 
B)  15.24 kHz 
C)  105 kHz 
D)  5.24 kHz

Question 19

Which of the following is not an advantage of a synchronous detection?

Accepted Answer

A)  Low distortion 
B)  Ability to produce gain 
C)  Eliminate diagonal clipping 
D)  ability to follow fast-modulated signals 
A)  Low distortion 
B)  Ability to produce gain 
C)  Eliminate diagonal clipping 
D)  ability to follow fast-modulated signals

Question 20

Double conversion is:

Accepted Answer

A)  a technique used to reduce image frequency problems in a superheterodyne receiver. 
B)  a method that ensures that a superheterodyne receiver does not break into oscillations due to stray positive feedback. 
C)  a technique used to solve the TRF tuning problems. 
D)  a receiver design that uses two superheterodyne receivers to receive a weak signal. 
A)  a technique used to reduce image frequency problems in a superheterodyne receiver. 
B)  a method that ensures that a superheterodyne receiver does not break into oscillations due to stray positive feedback. 
C)  a technique used to solve the TRF tuning problems. 
D)  a receiver design that uses two superheterodyne receivers to receive a weak signal.

A receiver's sensitivity is:

If a receiver is overly selective:

In a varactor diode, as voltage increases, capacitance:

A trimmer capacitor:

If a receiver is underselective:

A padder capacitor:

The only roadblock to having complete receivers on a chip aside from station selection and volume controls is:

Image frequency rejection on a standard AM broadcast band receiver is not a major problem since:

The diode detector:

A receiver's selectivity is:

Good troubleshooting practice says:

An AM signal having a carrier frequency of 560 kHz is to be mixed with a local oscillator signal at a frequency of 1035 kHz. What does the output of the IF amplifier consist of?

Diagonal clipping:

A receiver has a maximum input signal of 75 mW before distortion occurs. Its sensitivity is measured to be 1.5 nW. Its dynamic range is approximately:

A varicap:

The superheterodyne receiver design is superior to the TRF design:

An autodyne mixer is:

A TRF receiver is to be designed with a single tuned circuit using an 8.2 uH inductor. If the frequency is to be tuned from 55 kHz to 1600 kHz, find the BW that results at 550 kHz if there is exactly 10 kHz BW at a frequency of 1050 kHz

Which of the following is not an advantage of a synchronous detection?

Double conversion is:

Introductory Topics

Amplitude Modulation: Transmission

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters

Exam 3: Amplitude Modulation: Reception

A receiver's sensitivity is:

If a receiver is overly selective:

In a varactor diode, as voltage increases, capacitance:

A trimmer capacitor:

If a receiver is underselective:

A padder capacitor:

The only roadblock to having complete receivers on a chip aside from station selection and volume controls is:

Image frequency rejection on a standard AM broadcast band receiver is not a major problem since:

The diode detector:

A receiver's selectivity is:

Good troubleshooting practice says:

An AM signal having a carrier frequency of 560 kHz is to be mixed with a local oscillator signal at a frequency of 1035 kHz. What does the output of the IF amplifier consist of?

Diagonal clipping:

A receiver has a maximum input signal of 75 mW before distortion occurs. Its sensitivity is measured to be 1.5 nW. Its dynamic range is approximately:

A varicap:

The superheterodyne receiver design is superior to the TRF design:

An autodyne mixer is:

A TRF receiver is to be designed with a single tuned circuit using an 8.2 uH inductor. If the frequency is to be tuned from 55 kHz to 1600 kHz, find the BW that results at 550 kHz if there is exactly 10 kHz BW at a frequency of 1050 kHz

Which of the following is not an advantage of a synchronous detection?

Double conversion is:

Introductory Topics

Amplitude Modulation: Transmission

Single-Sideband Communications

Frequency Modulation: Transmission

Frequency Modulation: Reception

Communications Techniques

Digital Communications: Coding Techniques

Wired Digital Communications

Wireless Digital Communications

Network Communications

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Microwaves and Lasers

Television

Fiber Optics

Filters