Question 1

The reference level for the unit, dBm, is:

Accepted Answer

A)  the milliampere 
B)  the milliwatt 
C)  the millivolt 
D)  the watt 
A)  the milliampere 
B)  the milliwatt 
C)  the millivolt 
D)  the watt

Question 2

The radio receiver that simply consists of an RF amplifier, detector, and audio amplifier is known as:

Accepted Answer

A)  a sensitive receiver 
B)  a selective receiver 
C)  a TRF receiver 
D)  a superheterodyne receiver 
A)  a sensitive receiver 
B)  a selective receiver 
C)  a TRF receiver 
D)  a superheterodyne receiver

Question 3

The AGC control voltage:

Accepted Answer

A)  varies as the signal strength of the received signal varies. 
B)  is actually the dc voltage component produced by the mixing action in the AM demodulator stage. 
C)  a negative feedback voltage. 
D)  is produced by an RC circuit having a much larger time constant than that of the detector. 
E)  all of the above 
A)  varies as the signal strength of the received signal varies. 
B)  is actually the dc voltage component produced by the mixing action in the AM demodulator stage. 
C)  a negative feedback voltage. 
D)  is produced by an RC circuit having a much larger time constant than that of the detector. 
E)  all of the above

Question 4

In a superheterodyne receiver the bulk of the receiver's sensitivity and selectivity is due to the:

Accepted Answer

A)  IF amplifier stages. 
B)  local oscillator. 
C)  converter stages. 
D)  RF amplifier stages. 
A)  IF amplifier stages. 
B)  local oscillator. 
C)  converter stages. 
D)  RF amplifier stages.

Question 5

Synchronous detectors:

Accepted Answer

A)  offer low distortion compared to diode detectors. 
B)  have the ability to provide gain. 
C)  are often called product detectors. 
D)  all of the above 
A)  offer low distortion compared to diode detectors. 
B)  have the ability to provide gain. 
C)  are often called product detectors. 
D)  all of the above

Question 6

Electronics Workbench Multisim provides a feature that allows for the addition of a component fault in a circuit. This is accomplished by:

Accepted Answer

A)  double-clicking on the component, select fault and specify the type of failure 
B)  replacing the part with a non model part 
C)  replacing the part with an F-prefix part 
D)  all of the above 
E)  none of the above 
A)  double-clicking on the component, select fault and specify the type of failure 
B)  replacing the part with a non model part 
C)  replacing the part with an F-prefix part 
D)  all of the above 
E)  none of the above

Question 7

The mixer is often referred to as:

Accepted Answer

A)  an RF amplifier. 
B)  a first detector. 
C)  an oscillator generator. 
D)  a second detector. 
A)  an RF amplifier. 
B)  a first detector. 
C)  an oscillator generator. 
D)  a second detector.

Question 8

Which of the following is not an advantage of FETs over BJTs in RF amplifier usage?

Accepted Answer

A)  have improved image frequency rejection. 
B)  Their input/output square-law relationship allows for lower distortion levels. 
C)  The availability of dual gate FETs provides an isolated injection point for the AGC. 
D)  Their input impedance does not load down the Q of the circuit preceding the FET stage. 
A)  have improved image frequency rejection. 
B)  Their input/output square-law relationship allows for lower distortion levels. 
C)  The availability of dual gate FETs provides an isolated injection point for the AGC. 
D)  Their input impedance does not load down the Q of the circuit preceding the FET stage.

Question 9

Which is not an advantage of diode detectors?

Accepted Answer

A)  They are highly efficient. 
B)  They develop a readily usable dc voltage for automatic gain control circuits. 
C)  Power absorbed from the tuned circuit by the diode detector reduces the Q of the tuned circuit. 
D)  Distortion decreases as the amplitude of the AM signal increases. 
A)  They are highly efficient. 
B)  They develop a readily usable dc voltage for automatic gain control circuits. 
C)  Power absorbed from the tuned circuit by the diode detector reduces the Q of the tuned circuit. 
D)  Distortion decreases as the amplitude of the AM signal increases.

Question 10

A receiver has a dynamic range of 65 dB. It has a sensitivity of 0.88 nW. The maximum allowable input signal is approximately:

Accepted Answer

A)  1.56 uW 
B)  156 uW 
C)  278 mW 
D)  2.78 mW 
A)  1.56 uW 
B)  156 uW 
C)  278 mW 
D)  2.78 mW

Question 11

Varactor diodes are used for tuning by:

Accepted Answer

A)  capacitance adjustment through forward bias. 
B)  capacitance adjustment through a reverse bias diode. 
C)  temperature compensation of diodes. 
D)  all of the above 
A)  capacitance adjustment through forward bias. 
B)  capacitance adjustment through a reverse bias diode. 
C)  temperature compensation of diodes. 
D)  all of the above

Question 12

Which of the following is not a major benefit of using RF amplifier stages in superheterodyne receiver design?

Accepted Answer

A)  larger frequency tuning range 
B)  improved noise characteristics 
C)  improved image frequency rejection 
D)  more gain resulting in improved sensitivity 
A)  larger frequency tuning range 
B)  improved noise characteristics 
C)  improved image frequency rejection 
D)  more gain resulting in improved sensitivity

The reference level for the unit, dBm, is:

The radio receiver that simply consists of an RF amplifier, detector, and audio amplifier is known as:

The AGC control voltage:

In a superheterodyne receiver the bulk of the receiver's sensitivity and selectivity is due to the:

Synchronous detectors:

Electronics Workbench Multisim provides a feature that allows for the addition of a component fault in a circuit. This is accomplished by:

The mixer is often referred to as:

Which of the following is not an advantage of FETs over BJTs in RF amplifier usage?

Which is not an advantage of diode detectors?

A receiver has a dynamic range of 65 dB. It has a sensitivity of 0.88 nW. The maximum allowable input signal is approximately:

Varactor diodes are used for tuning by:

Which of the following is not a major benefit of using RF amplifier stages in superheterodyne receiver design?

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

The reference level for the unit, dBm, is:

The radio receiver that simply consists of an RF amplifier, detector, and audio amplifier is known as:

The AGC control voltage:

In a superheterodyne receiver the bulk of the receiver's sensitivity and selectivity is due to the:

Synchronous detectors:

Electronics Workbench Multisim provides a feature that allows for the addition of a component fault in a circuit. This is accomplished by:

The mixer is often referred to as:

Which of the following is not an advantage of FETs over BJTs in RF amplifier usage?

Which is not an advantage of diode detectors?

A receiver has a dynamic range of 65 dB. It has a sensitivity of 0.88 nW. The maximum allowable input signal is approximately:

Varactor diodes are used for tuning by:

Which of the following is not a major benefit of using RF amplifier stages in superheterodyne receiver design?

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