General
FM receiver
SSB and CW Receivers
Filters
Detection
FM receiver
SSB and CW Receivers
Filters
Detection
Basic Qualification Question Bank for Amateur Radio Operator Certificate Examinations 12 June, 2014
Receivers
General
(A)
B-003-010-002 The figure in a receiver's specifications which indicates its sensitivity is the:
A RF input signal needed to achieve a given signal plus noise to noise ratio
B audio output in watts
C bandwidth of the IF in kilohertz
D number of RF amplifiers
(B)
B-003-010-003 If two receivers of different sensitivity are compared, the less sensitive receiver will produce:
A more signal or less noise
B less signal or more noise
C a steady oscillator drift
D more than one signal
(B)
B-003-010-008 The three main parameters against which the quality of a receiver is measured are:
A sensitivity, selectivity and image rejection
B sensitivity, selectivity and stability
C selectivity, stability and frequency range
D sensitivity, stability and cross-modulation
FM Receiver
(A)
B-003-003-001 In a frequency modulation receiver, the ________is connected to the input of the radio frequency amplifier.
A antenna
B mixer
C frequency discriminator
D limiter
(C)
B-003-003-002 In a frequency modulation receiver, the __________ is in between the antenna and the mixer.
A local oscillator
B intermediate frequency amplifier
C radio frequency amplifier
D audio frequency amplifier
(D)
B-003-003-003 In a frequency modulation receiver, the output of the local oscillator is fed to the:
A radio frequency amplifier
B limiter
C antenna
D mixer
(C)
B-003-003-004 In a frequency modulation receiver, the output of the ________is connected to the mixer.
A intermediate frequency amplifier
B speaker or headphones
C local oscillator
D frequency discriminator
(B)
B-003-003-005 In a frequency modulation receiver, the_________ is in between the mixer and the intermediate frequency amplifier.
A radio frequency amplifier
B filter
C limiter
D frequency discriminator
(D)
B-003-003-006 In a frequency modulation receiver, the ________ is located between the filter and the limiter.
A local oscillator
B mixer
C radio frequency amplifier
D intermediate frequency amplifier
(D)
B-003-003-007 In a frequency modulation receiver, the__________ is in between the intermediate frequency amplifier and the frequency discriminator.
A filter
B local oscillator
C radio frequency amplifier
D limiter
(A)
B-003-003-008 In a frequency modulation receiver, the __________ is located between the limiter and the audio frequency amplifier.
A frequency discriminator
B intermediate frequency amplifier
C speaker or headphones
D local oscillator
(C)
B-003-003-009 In a frequency modulation receiver, the _________ is located between the speaker or headphones and the frequency discriminator.
A intermediate frequency amplifier
B radio frequency amplifier
C audio frequency amplifier
D limiter
(D)
B-003-003-010 In a frequency modulation receiver, the __________ connects to the audio frequency amplifier output.
A intermediate frequency amplifier
B frequency discriminator
C limiter
D speaker or headphones
SSB and CW Receivers
(B)
B-003-005-001 In a single sideband and CW receiver, the antenna is connected to the ____________ .
A intermediate frequency amplifier
B radio frequency amplifier
C product detector
D local oscillator
(B)
B-003-005-002 In a single sideband and CW receiver, the output of the _____________ is connected to the mixer.
A audio frequency amplifier
B radio frequency amplifier
C filter
D intermediate frequency amplifier
(A)
B-003-005-003 In a single sideband and CW receiver, the __________ is connected to the radio frequency amplifier and the local oscillator.
A mixer
B beat frequency oscillator
C product detector
D filter
(A)
B-003-005-004 In a single sideband and CW receiver, the output of the ___________ is connected to the mixer.
A local oscillator
B intermediate frequency amplifier
C beat frequency oscillator
D product detector
(B)
B-003-005-005 In a single sideband and CW receiver, the _____________ is in between the mixer and intermediate frequency amplifier.
A product detector
B filter
C radio frequency amplifier
D beat frequency oscillator
(D)
B-003-005-006 In a single sideband and CW receiver, the __________ is in between the filter and product detector.
A audio frequency amplifier
B beat frequency oscillator
C radio frequency amplifier
D intermediate frequency amplifier
(B)
B-003-005-007 In a single sideband and CW receiver, the __________ output is connected to the audio frequency amplifier.
A intermediate frequency amplifier
B product detector
C local oscillator
D beat frequency oscillator
(B)
B-003-005-008 In a single sideband and CW receiver, the output of the ___________ is connected to the product detector.
A audio frequency amplifier
B beat frequency oscillator
C mixer
D radio frequency amplifier
(A)
B-003-005-009 In a single sideband and CW receiver, the __________ is connected to the output of the product detector.
A audio frequency amplifier
B intermediate frequency amplifier
C local oscillator
D radio frequency amplifier
(B)
B-003-005-010 In a single sideband and CW receiver, the __________ is connected to the output of the audio frequency amplifier.
A beat frequency oscillator
B speaker or headphones
C mixer
D radio frequency amplifier
(D)
B-003-010-005 A receiver designed for SSB reception must have a BFO(beat frequency oscillator) because:
A it beats with the received carrier to produce the other sideband
B it reduces the passband of the IF stages
C it phases out the unwanted sideband signal
D the suppressed carrier must be replaced for detection
(B)
B-003-010-006 A receiver receives an incoming signal of 3.54 MHz, and the local oscillator produces a signal of 3.995 MHz. To which frequency should the IF be tuned?
A 3.54 MHz
B 455 kHz
C 7.435 MHz
D 3.995 MHz
Filters
(D)
B-003-010-007 What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?
A A band pass filter
B An all pass filter
C A pi-network filter
D A notch filter
(C)
B-003-010-009 A communications receiver has four filters installed in it, respectively designated as 250 Hz, 500 Hz, 2.4 kHz, and 6 kHz. If you were listening to single sideband, which filter would you utilize?
A 6 kHz
B 500 Hz
C 2.4 kHz
D 250 Hz
(A)
B-003-010-010 A communications receiver has four filters installed in it, respectively designated as 250 Hz, 500 Hz, 2.4 kHz and 6 kHz. You are copying a CW transmission and there is a great deal of interference. Which one of the filters would you choose?
A 250 Hz
B 500 Hz
C 2.4 kHz
D 6 kHz
(A)
B-003-010-011 Selectivity can be placed in the audio stages of a receiver by the utilization of RC active or passive audio filters. If you were to copy CW, which of the following bandpasses would you choose?
A 750 - 850 Hz
B 2100 - 2300 Hz
C 300 - 2700 Hz
D 100 - 1100 Hz
Detection
(A)
B-004-002-002 One important application for diodes is recovering information from transmitted signals. This is referred to as:
A demodulation
B regeneration
C ionization
D biasing
Receivers
General
(A)
B-003-010-002 The figure in a receiver's specifications which indicates its sensitivity is the:
A RF input signal needed to achieve a given signal plus noise to noise ratio
B audio output in watts
C bandwidth of the IF in kilohertz
D number of RF amplifiers
(B)
B-003-010-003 If two receivers of different sensitivity are compared, the less sensitive receiver will produce:
A more signal or less noise
B less signal or more noise
C a steady oscillator drift
D more than one signal
(B)
B-003-010-008 The three main parameters against which the quality of a receiver is measured are:
A sensitivity, selectivity and image rejection
B sensitivity, selectivity and stability
C selectivity, stability and frequency range
D sensitivity, stability and cross-modulation
FM Receiver
(A)
B-003-003-001 In a frequency modulation receiver, the ________is connected to the input of the radio frequency amplifier.
A antenna
B mixer
C frequency discriminator
D limiter
(C)
B-003-003-002 In a frequency modulation receiver, the __________ is in between the antenna and the mixer.
A local oscillator
B intermediate frequency amplifier
C radio frequency amplifier
D audio frequency amplifier
(D)
B-003-003-003 In a frequency modulation receiver, the output of the local oscillator is fed to the:
A radio frequency amplifier
B limiter
C antenna
D mixer
(C)
B-003-003-004 In a frequency modulation receiver, the output of the ________is connected to the mixer.
A intermediate frequency amplifier
B speaker or headphones
C local oscillator
D frequency discriminator
(B)
B-003-003-005 In a frequency modulation receiver, the_________ is in between the mixer and the intermediate frequency amplifier.
A radio frequency amplifier
B filter
C limiter
D frequency discriminator
(D)
B-003-003-006 In a frequency modulation receiver, the ________ is located between the filter and the limiter.
A local oscillator
B mixer
C radio frequency amplifier
D intermediate frequency amplifier
(D)
B-003-003-007 In a frequency modulation receiver, the__________ is in between the intermediate frequency amplifier and the frequency discriminator.
A filter
B local oscillator
C radio frequency amplifier
D limiter
(A)
B-003-003-008 In a frequency modulation receiver, the __________ is located between the limiter and the audio frequency amplifier.
A frequency discriminator
B intermediate frequency amplifier
C speaker or headphones
D local oscillator
(C)
B-003-003-009 In a frequency modulation receiver, the _________ is located between the speaker or headphones and the frequency discriminator.
A intermediate frequency amplifier
B radio frequency amplifier
C audio frequency amplifier
D limiter
(D)
B-003-003-010 In a frequency modulation receiver, the __________ connects to the audio frequency amplifier output.
A intermediate frequency amplifier
B frequency discriminator
C limiter
D speaker or headphones
SSB and CW Receivers
(B)
B-003-005-001 In a single sideband and CW receiver, the antenna is connected to the ____________ .
A intermediate frequency amplifier
B radio frequency amplifier
C product detector
D local oscillator
(B)
B-003-005-002 In a single sideband and CW receiver, the output of the _____________ is connected to the mixer.
A audio frequency amplifier
B radio frequency amplifier
C filter
D intermediate frequency amplifier
(A)
B-003-005-003 In a single sideband and CW receiver, the __________ is connected to the radio frequency amplifier and the local oscillator.
A mixer
B beat frequency oscillator
C product detector
D filter
(A)
B-003-005-004 In a single sideband and CW receiver, the output of the ___________ is connected to the mixer.
A local oscillator
B intermediate frequency amplifier
C beat frequency oscillator
D product detector
(B)
B-003-005-005 In a single sideband and CW receiver, the _____________ is in between the mixer and intermediate frequency amplifier.
A product detector
B filter
C radio frequency amplifier
D beat frequency oscillator
(D)
B-003-005-006 In a single sideband and CW receiver, the __________ is in between the filter and product detector.
A audio frequency amplifier
B beat frequency oscillator
C radio frequency amplifier
D intermediate frequency amplifier
(B)
B-003-005-007 In a single sideband and CW receiver, the __________ output is connected to the audio frequency amplifier.
A intermediate frequency amplifier
B product detector
C local oscillator
D beat frequency oscillator
(B)
B-003-005-008 In a single sideband and CW receiver, the output of the ___________ is connected to the product detector.
A audio frequency amplifier
B beat frequency oscillator
C mixer
D radio frequency amplifier
(A)
B-003-005-009 In a single sideband and CW receiver, the __________ is connected to the output of the product detector.
A audio frequency amplifier
B intermediate frequency amplifier
C local oscillator
D radio frequency amplifier
(B)
B-003-005-010 In a single sideband and CW receiver, the __________ is connected to the output of the audio frequency amplifier.
A beat frequency oscillator
B speaker or headphones
C mixer
D radio frequency amplifier
(D)
B-003-010-005 A receiver designed for SSB reception must have a BFO(beat frequency oscillator) because:
A it beats with the received carrier to produce the other sideband
B it reduces the passband of the IF stages
C it phases out the unwanted sideband signal
D the suppressed carrier must be replaced for detection
(B)
B-003-010-006 A receiver receives an incoming signal of 3.54 MHz, and the local oscillator produces a signal of 3.995 MHz. To which frequency should the IF be tuned?
A 3.54 MHz
B 455 kHz
C 7.435 MHz
D 3.995 MHz
Filters
(D)
B-003-010-007 What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?
A A band pass filter
B An all pass filter
C A pi-network filter
D A notch filter
(C)
B-003-010-009 A communications receiver has four filters installed in it, respectively designated as 250 Hz, 500 Hz, 2.4 kHz, and 6 kHz. If you were listening to single sideband, which filter would you utilize?
A 6 kHz
B 500 Hz
C 2.4 kHz
D 250 Hz
(A)
B-003-010-010 A communications receiver has four filters installed in it, respectively designated as 250 Hz, 500 Hz, 2.4 kHz and 6 kHz. You are copying a CW transmission and there is a great deal of interference. Which one of the filters would you choose?
A 250 Hz
B 500 Hz
C 2.4 kHz
D 6 kHz
(A)
B-003-010-011 Selectivity can be placed in the audio stages of a receiver by the utilization of RC active or passive audio filters. If you were to copy CW, which of the following bandpasses would you choose?
A 750 - 850 Hz
B 2100 - 2300 Hz
C 300 - 2700 Hz
D 100 - 1100 Hz
Detection
(A)
B-004-002-002 One important application for diodes is recovering information from transmitted signals. This is referred to as:
A demodulation
B regeneration
C ionization
D biasing
