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1992-01-26
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FCC ADVANCED Exam Question Pool. Subelement 4AD.
Amateur Radio Practice. 4 Questions.
---------------------------------------------------
4AD 1.1 B
What is a frequency standard?
A. A net frequency
B. A device used to produce a highly accurate reference frequency
C. A device for accurately measuring frequency to within 1 Hz
D. A device used to generate wideband random frequencies
4AD 1.2 A
What is a frequency-marker generator?
A. A device used to produce a highly accurate reference frequency
B. A sweep generator
C. A broadband white noise generator
D. A device used to generate wideband random frequencies
4AD 1.3 B
How is a frequency-marker generator used?
A. In conjunction with a grid-dip meter
B. To provide reference points on a receiver dial
C. As the basic frequency element of a transmitter
D. To directly measure wavelength
4AD 1.4 A
What is a frequency counter?
A. A frequency measuring device
B. A frequency marker generator
C. A device that determines whether or not a given frequency is in use
before automatic transmissions are made
D. A broadband white noise generator
4AD 1.5 D
How is a frequency counter used?
A. To provide reference points on an analog receiver dial
B. To generate a frequency standard
C. To measure the deviation in an FM transmitter
D. To measure frequency
4AD 1.6 C
What is the most the actual transmitter frequency could differ from a
reading of 146,520,000-Hertz on a frequency counter with a time base
accuracy of +/- 1.0 ppm?
A. 165.2 Hz
B. 14.652 kHz
C. 146.52 Hz
D. 1.4652 MHz
4AD 1.7 A
What is the most the actual transmitter frequency could differ from a
reading of 146,520,000-Hertz on a frequency counter with a time base
accuracy of +/- 0.1 ppm?
A. 14.652 Hz
B. 0.1 MHz
C. 1.4652 Hz
D. 1.4652 kHz
4AD 1.8 D
What is the most the actual transmitter frequency could differ from a
reading of 146,520,000-Hertz on a frequency counter with a time base
accuracy of +/- 10 ppm?
A. 146.52 Hz
B. 10 Hz
C. 146.52 kHz
D. 1465.20 Hz
4AD 1.9 D
What is the most the actual transmitter frequency could differ from a
reading of 432,100,000-Hertz on a frequency counter with a time base
accuracy of +/- 1.0 ppm?
A. 43.21 MHz
B. 10 Hz
C. 1.0 MHz
D. 432.1 Hz
4AD 1.10 A
What is the most the actual transmit frequency could differ from a reading
of 432,100,000-Hertz on a frequency counter with a time base accuracy of +/-
0.1 ppm?
A. 43.21 Hz
B. 0.1 MHz
C. 432.1 Hz
D. 0.2 MHz
4AD 1.11 C
What is the most the actual transmit frequency could differ from a reading
of 432,100,000-Hertz on a frequency counter with a time base accuracy of +/-
10 ppm?
A. 10 MHz
B. 10 Hz
C. 4321 Hz
D. 432.1 Hz
4AD 2.1 C
What is a dip-meter?
A. A field strength meter
B. An SWR meter
C. A variable LC oscillator with metered feedback current
D. A marker generator
4AD 2.2 D
Why is a dip-meter used by many amateur operators?
A. It can measure signal strength accurately
B. It can measure frequency accurately
C. It can measure transmitter output power accurately
D. It can give an indication of the resonant frequency of a circuit
4AD 2.3 B
How does a dip-meter function?
A. Reflected waves at a specific frequency desensitize the detector coil
B. Power coupled from an oscillator causes a decrease in metered current
C. Power from a transmitter cancels feedback current
D. Harmonics of the oscillator cause an increase in resonant circuit Q
4AD 2.4 D
What two ways could a dip-meter be used in an amateur station?
A. To measure resonant frequency of antenna traps and to measure percentage
of modulation
B. To measure antenna resonance and to measure percentage of modulation
C. To measure antenna resonance and to measure antenna impedance
D. To measure resonant frequency of antenna traps and to measure a tuned
circuit resonant frequency
4AD 2.5 B
What types of coupling occur between a dip-meter and a tuned circuit being
checked?
A. Resistive and inductive
B. Inductive and capacitive
C. Resistive and capacitive
D. Strong field
4AD 2.6 A
How tight should the dip-meter be coupled with the tuned circuit being
checked?
A. As loosely as possible, for best accuracy
B. As tightly as possible, for best accuracy
C. First loose, then tight, for best accuracy
D. With a soldered jumper wire between the meter and the circuit to be
checked, for best accuracy
4AD 2.7 B
What happens in a dip-meter when it is too tightly coupled with the tuned
circuit being checked?
A. Harmonics are generated
B. A less accurate reading results
C. Cross modulation occurs
D. Intermodulation distortion occurs
4AD 3.1 A
What factors limit the accuracy, frequency response, and stability of an
oscilloscope?
A. Sweep oscillator quality and deflection amplifier bandwidth
B. Tube face voltage increments and deflection amplifier voltage
C. Sweep oscillator quality and tube face voltage increments
D. Deflection amplifier output impedance and tube face frequency increments
4AD 3.2 D
What factors limit the accuracy, frequency response, and stability of a
D'Arsonval movement type meter?
A. Calibration, coil impedance and meter size
B. Calibration, series resistance and electromagnet current
C. Coil impedance, electromagnet voltage and movement mass
D. Calibration, mechanical tolerance and coil impedance
4AD 3.3 B
What factors limit the accuracy, frequency response, and stability of a
frequency counter?
A. Number of digits in the readout, speed of the logic and time base
stability
B. Time base accuracy, speed of the logic and time base stability
C. Time base accuracy, temperature coefficient of the logic and time base
stability
D. Number of digits in the readout, external frequency reference and
temperature coefficient of the logic
4AD 3.4 D
How can the frequency response of an oscilloscope be improved?
A. By using a triggered sweep and a crystal oscillator as the time base
B. By using a crystal oscillator as the time base and increasing the
vertical sweep rate
C. By increasing the vertical sweep rate and the horizontal amplifier
frequency response
D. By increasing the horizontal sweep rate and the vertical amplifier
frequency response
4AD 3.5 C
How can the accuracy of a frequency counter be improved?
A. By using slower digital logic
B. By improving the accuracy of the frequency response
C. By increasing the accuracy of the time base
D. By using faster digital logic
4AD 4.1 D
What is the condition called which occurs when the signals of two
transmitters in close proximity mix together in one or both of their final
amplifiers, and unwanted signals at the sum and difference frequencies of
the original transmissions are generated?
A. Amplifier desensitization
B. Neutralization
C. Adjacent channel interference
D. Intermodulation interference
4AD 4.2 B
How does intermodulation interference between two transmitters usually
occur?
A. When the signals from the transmitters are reflected out of phase from
airplanes passing overhead
B. When they are in close proximity and the signals mix in one or both of
their final amplifiers
C. When they are in close proximity and the signals cause feedback in one or
both of their final amplifiers
D. When the signals from the transmitters are reflected in phase from
airplanes passing overhead
4AD 4.3 B
How can intermodulation interference between two transmitters in close
proximity often be reduced or eliminated?
A. By using a Class C final amplifier with high driving power
B. By installing a terminated circulator or ferrite isolator in the feed
line to the transmitter and duplexer
C. By installing a band-pass filter in the antenna feed line
D. By installing a low-pass filter in the antenna feed line
4AD 4.4 D
What can occur when a non-linear amplifier is used with a single-sideband
phone transmitter?
A. Reduced amplifier efficiency
B. Increased intelligibility
C. Sideband inversion
D. Distortion
4AD 4.5 B
How can even-order harmonics be reduced or prevented in transmitter
amplifier design?
A. By using a push-push amplifier
B. By using a push-pull amplifier
C. By operating class C
D. By operating class AB
4AD 5.1 C
What is receiver desensitizing?
A. A burst of noise when the squelch is set too low
B. A burst of noise when the squelch is set too high
C. A reduction in receiver sensitivity because of a strong signal on a
nearby frequency
D. A reduction in receiver sensitivity when the AF gain control is turned
down
4AD 5.2 A
What is the term used to refer to the reduction of receiver gain caused by
the signals of a nearby station transmitting in the same frequency band?
A. Desensitizing
B. Quieting
C. Cross modulation interference
D. Squelch gain rollback
4AD 5.3 C
What is the term used to refer to a reduction in receiver sensitivity caused
by unwanted high-level adjacent channel signals?
A. Intermodulation distortion
B. Quieting
C. Desensitizing
D. Overloading
4AD 5.4 C
What causes receiver desensitizing?
A. Audio gain adjusted too low
B. Squelch gain adjusted too high
C. The presence of a strong signal on a nearby frequency
D. Squelch gain adjusted too low
4AD 5.5 A
How can receiver desensitizing be reduced?
A. Ensure good RF shielding between the transmitter and receiver
B. Increase the transmitter audio gain
C. Decrease the receiver squelch gain
D. Increase the receiver bandwidth
4AD 6.1 D
What is cross-modulation interference?
A. Interference between two transmitters of different modulation type
B. Interference caused by audio rectification in the receiver preamp
C. Harmonic distortion of the transmitted signal
D. Modulation from an unwanted signal is heard in addition to the desired
signal
4AD 6.2 B
What is the term used to refer to the condition where the signals from a
very strong station are superimposed on other signals being received?
A. Intermodulation distortion
B. Cross-modulation interference
C. Receiver quieting
D. Capture effect
4AD 6.3 A
How can cross-modulation in a receiver be reduced?
A. By installing a filter at the receiver
B. By using a better antenna
C. By increasing the receiver's RF gain while decreasing the AF gain
D. By adjusting the pass-band tuning
4AD 6.4 C
What is the result of cross-modulation?
A. A decrease in modulation level of transmitted signals
B. Receiver quieting
C. The modulation of an unwanted signal is heard on the desired signal
D. Inverted sidebands in the final stage of the amplifier
4AD 7.1 C
What is the capture effect?
A. All signals on a frequency are demodulated by an FM receiver
B. All signals on a frequency are demodulated by an AM receiver
C. The loudest signal received is the only demodulated signal
D. The weakest signal received is the only demodulated signal
4AD 7.2 C
What is the term used to refer to the reception blockage of one FM-phone
signal by another FM-phone signal?
A. Desensitization
B. Cross-modulation interference
C. Capture effect
D. Frequency discrimination
4AD 7.3 A
With which emission type is the capture-effect most pronounced?
A. FM
B. SSB
C. AM
D. CW
--------------------------------------------------
End of Subelement 4AD.