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ELE2H
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1992-01-26
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FCC NOVICE Exam Question Pool. Subelement 2H.
Signals and Emissions. 2 Questions.
---------------------------------------------------
2H 1-1.1 B
What keying method is used to transmit CW?
A. Frequency-shift keying of a radio-frequency signal
B. On/off keying of a radio-frequency signal
C. Audio-frequency-shift keying of an oscillator tone
D. On/off keying of an audio-frequency signal
2H 1-1.2 C
What emission type describes international Morse code telegraphy
messages?
A. RTTY
B. Image
C. CW
D. Phone
2H 1-2.1 A
What emission type describes narrow-band direct-printing
telegraphy messages?
A. RTTY
B. Image
C. CW
D. Phone
2H 1-2.2 A
What keying method is used to transmit RTTY messages?
A. Frequency-shift keying of a radio-frequency signal
B. On/off keying of a radio-frequency signal
C. Digital pulse-code keying of an unmodulated carrier
D. On/off keying of an audio-frequency signal
2H 1-3.1 A
What emission designator describes frequency-modulated voice
transmissions?
A. FM phone
B. Image
C. CW
D. Single-sideband phone
2H 1-4.1 D
What emission designator describes single-sideband suppressed-carrier (SSB)
voice transmissions?
( THIS QUESTION NOT TO BE USED SINCE INCEPTION OF NO-CODE TECH CLASS )
A. FM phone
B. Image
C. CW
D. Single-sideband phone
2H 2.1 B
What does the term key click mean?
A. The mechanical noise caused by closing a straight key
too hard
B. The clicking noise from an excessively square CW keyed
waveform
C. The sound produced in a receiver from a CW signal faster
than 20 WPM
D. The sound of a CW signal being copied on an AM receiver
2H 2.2 D
How can key clicks be eliminated?
A. By reducing your keying speed to less than 20 WPM
B. By increasing power to the maximum allowable level
C. By using a power supply with better regulation
D. By using a key-click filter
2H 3.1 C
What does the term chirp mean?
A. A distortion in the receiver audio circuits
B. A high-pitched audio tone transmitted with a CW signal
C. A slight shift in oscillator frequency each
time a CW transmitter is keyed
D. A slow change in transmitter frequency as the circuit
warms up
2H 3.2 B
What can be done to the power supply of a CW transmitter
to avoid chirp?
A. Resonate the power supply filters
B. Regulate the power supply output voltages
C. Use a buffer amplifier between the transmitter output
and the feed line
D. Hold the power supply current to a fixed value
2H 4.1 D
What is a common cause of superimposed hum?
A. Using a nonresonant random-wire antenna
B. Sympathetic vibrations from a nearby transmitter
C. Improper neutralization of the transmitter output stage
D. A defective filter capacitor in the power supply
2H 4.2 B
What type of problem can a bad power-supply filter
capacitor cause in a transmitter or receiver?
A. Sympathetic vibrations in nearby receivers
B. A superimposed hum or buzzing sound
C. Extreme changes in antenna resonance
D. Imbalance in the mixers
2H 5.1 A
What is the 4th harmonic of a 7160-kHz signal?
A. 28,640 kHz
B. 35,800 kHz
D. 28,160 kHz
D. 1790 kHz
2H 5.2 C
You receive an FCC Notice of Violation stating that your station
was heard on 21,375 kHz. At the time listed on the notice, you
were operating on 7125 kHz. What is a possible cause of this
violation?
A. Your transmitter has a defective power-supply filter capacitor
B. Your CW keying speed was excessively fast
C. Your transmitter was radiating excess harmonic signals
D. Your transmitter has a defective power-supply filter choke
2H 6.1 A
What may happen to body tissues that are exposed to large
amounts of UHF or microwave RF energy?
A. The tissue may be damaged because of the heat produced
B. The tissue may suddenly be frozen
C. The tissue may be immediately destroyed because of the
Maxwell Effect
D. The tissue may become less resistant to cosmic radiation
2H 6.2 C
What precaution should you take before working near a high-gain
UHF or microwave antenna (such as a parabolic, or dish antenna)?
A. Be certain the antenna is FCC type accepted
B. Be certain the antenna and transmitter are properly grounded
C. Be certain the transmitter cannot be operated
D. Be certain the antenna safety interlocks are in place
2H 6.3 A
You are installing a VHF or UHF mobile radio in your
vehicle. What is the best location to mount the antenna
on the vehicle to minimize any danger from RF exposure
to the driver or passengers?
A. In the middle of the roof
B. Along the top of the windshield
C. On either front fender
D. On the trunk lid
2H 7.1 C
You discover that your tube-type transmitter power amplifier is
radiating spurious emissions. What is the most likely cause of
this problem?
A. Excessively fast keying speed
B. Undermodulation
C. Improper neutralization
D. Tank-circuit current dip at resonance
2H 7.2 D
Your transmitter radiates signals outside the amateur band where
you are transmitting. What term describes this radiation?
A. Off-frequency emissions
B. Transmitter chirp
C. Incidental radiation
D. Spurious emissions
2H 7.3 A
What problem can occur if you operate your transmitter without the
cover and other shielding in place?
A. Your transmitter can radiate spurious emissions
B. Your transmitter may radiate a "chirpy" signal
C. The final amplifier efficiency of your transmitter may decrease
D. You may cause splatter interference to other stations operating
on nearby frequencies
2H 7.4 B
What type of interference will you cause if you operate your SSB
transmitter with the microphone gain adjusted too high?
A. You may cause digital interference to computer equipment in
your neighborhood
B. You may cause splatter interference to other stations operating
on nearby frequencies
C. You may cause atmospheric interference in the air around your
antenna
D. You may cause processor interference to the microprocessor in
your rig
2H 7.5 B
What may happen if you adjust the microphone gain or deviation
control on your FM transmitter too high?
A. You may cause digital interference to computer equipment in
your neighborhood
B. You may cause interference to other stations operating on
nearby frequencies
C. You may cause atmospheric interference in the air around your
antenna
D. You may cause processor interference to the microprocessor
in your rig
2H 7.6 B
What type of interference can excessive amounts of speech
processing in your SSB transmitter cause?
A. You may cause digital interference to computer equipment
in your neighborhood
B. You may cause splatter interference to other stations
operating on nearby frequencies
C. You may cause atmospheric interference in the air around
your antenna
D. You may cause processor interference to the microprocessor
in your rig
--------------------------------------------------
End of Subelement 2H.