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1991-06-30
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FCC Technician Exam Question Pool - Subelement 3AD.
(Valid 7/1/90 thru/10/31/92)
AMATEUR RADIO PRACTICES (4 Exam Questions)
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3D-1-1.1 C
Where should the Green wire in an AC line cord
be attached in a power supply?
A. To the fuse.
B. To the "hot" side of the power switch.
C. To the chassis.
D. To the meter.
3D-1-1.2 D
Where should the Black (or Red) wire in
a three wire line cord be attached in a power supply?
A. To the filter capacitor.
B. To the DC ground.
C. To the chassis.
D. To the fuse.
3D-1-1.3 B
Where should the White wire in
a three wire line cord be attached in a power supply.
A. To the side of the transformer's primary winding
that has a fuse.
B. To one side of the transformer's primary winding
without a fuse.
C. To the Black wire.
D. To the rectifier junction.
3D-1-1.4 B
Why is the retaining screw in one terminal of a light socket
made of brass, while the other one is silver colored?
A. To prevent galvanic action.
B. To indicate correct polarity.
C. To better conduct current.
D. To reduce skin effect.
3D-1-2.1 A
How much electrical current flowing through
the Human Body is usually fatal?
A. As little as 100 milliamperes may be fatal.
B. Approximately 10 amperes is required to be fatal.
C. More than 20 amperes is needed to kill a human being.
D. No amount of current will harm you. Voltages of
over 2000 volts are always fatal, however.
3D-1-2.2 A
What is the minimum voltage considered
to be dangerous to humans?
A. 30 volts.
B. 100 volts.
C. 1000 volts.
D. 2000 volts.
3D-1-2.3 A
How much electrical current flowing through
the Human Body is usually painful?
A. As little as 50 milliamperes may be painful.
B. Approximately 10 amperes is required to be painful.
C. More than 20 amperes is needed
to be painful to a human being.
D. No amount of current will be painful. Voltages of
over 2000 volts are always painful, however.
3D-1-3.1 C
Where should the Main Power line switch for
a High Voltage Power Supply be situated?
A. Inside the cabinet, to interrupt power
when the cabinet is opened.
B. On the rear panel of the High Voltage Supply.
C. Where it can be seen and reached easily.
D. This supply should not be switch operated.
3D-2-1.1 B
How is a voltmeter typically connected to a circuit under test?
A. In series with the circuit.
B. In parallel with the circuit.
C. In quadrature with the circuit.
D. In phase with the circuit.
3D-2-2.1 C
How can the range of a voltmeter be extended?
A. By adding resistance in series with the circuit under test.
B. By adding resistance in parallel with the circuit under test.
C. By adding resistance in series with the meter.
D. By adding resistance in parallel with the meter.
3D-3-1.1 A
How is an ammeter typically connected to a circuit under test?
A. In series with the circuit.
B. In parallel with the circuit.
C. In quadrature with the circuit.
D. In phase with the circuit.
3D-3-2.1 D
How can the range of an ammeter be extended?
A. By adding resistance in series with the circuit under test.
B. By adding resistance in parallel with the circuit under test.
C. By adding resistance in series with the meter.
D. By adding resistance in parallel with the meter.
3D-4.1 D
What is a MULTIMETER?
A. An instrument capable of reading SWR and power.
B. An instrument capable of reading
resistance, capacitance and inductance.
C. An instrument capable of reading resistance and reactance.
D. An instrument capable of reading
voltage, current and resistance.
3D-5-1.1 A
Where in the antenna transmission line should
a peak-reading wattmeter be attached
to determine the transmitter power output?
A. At the transmitter output.
B. At the antenna feedpoint.
C. One Half wavelength from the antenna feedpoint.
D. One Quarter wavelength from the transmitter output.
3D-5-1.2 C
For the most accurate readings of a transmitter output power,
where should the RF Wattmeter be inserted?
A. The wattmeter should be inserted and the output measured
one-quarter wavelength from the antenna feedpoint.
B. The wattmeter should be inserted and the output measured
one-half wavelength from the antenna feedpoint.
C. The wattmeter should be inserted and the output power
measured at the transmitter antenna jack.
D. The wattmeter should be inserted and the output power
measured at the Transmatch output.
3D-5-1.3 B
At what line impedance are RF wattmeters usually designed
to operate?
A. 25 Ohms.
B. 50 Ohms.
C. 100 Ohms.
D. 300 Ohms.
3D-5-1.4 A
What is a DIRECTIONAL WATTMETER?
A. An instrument that measures forward or reflected power.
B. An instrument that measures the
directional pattern of an antenna.
C. An instrument that measures the energy
consumed by the transmitter.
D. An instrument that measures thermal
heating in a load resistor.
3D-5-2.1 B
If a directional RF wattmeter indicates
90 Watts forward power and 10 Watts reflected
power, what is the actual transmitter forward power?
A. 10 watts.
B. 80 watts.
C. 90 watts.
D. 100 watts.
3D-5-2.2 C
If a directional RF wattmeter indicates
96 Watts forward power and 4 Watts reflected
power, what is the actual transmitter forward power?
A. 80 watts.
B. 88 watts.
C. 92 watts.
D. 100 watts.
3D-6.1 A
What is a MARKER GENERATOR?
A. A high-stability oscillator that generates a series
of reference signals at known frequency intervals.
B. A low stability oscillator that "Sweeps"
through a band of frequencies.
C. An oscillator often used in aircraft to
determine the craft's location relative
the inner and outer markers at airports.
D. A high-stability oscillator whose output frequency
and amplitude can be varied over a wide range.
3D-6.2 D
What type of circuit is used to inject a frequency
calibration signal into a communications receiver?
A. A product detector.
B. A receiver incremental tuning circuit.
C. A balanced modulator.
D. A crystal calibrator.
3D-6.3 A
How is a MARKER GENERATOR used?
A. To calibrate the tuning dial on a receiver.
B. To calibrate the volume control on a receiver.
C. To test the amplitude linearity of an SSB transmitter.
D. To test the frequency deviation of an FM transmitter.
3D-7.1 C
What piece of test equipment produces a stable, low-level signal that
can be set to a specific frequency?
A. A wavemeter.
B. A reflectometer.
C. A signal generator.
D. A balanced modulator.
3D-7.2 B
What is an RF SIGNAL GENERATOR commonly used for?
A. Measuring RF signal amplitude.
B. Aligning receiver tuned circuits.
C. Adjusting the transmitter impedance matching network.
D. Measuring transmission line impedance.
3D-8-1.1 D
What is a REFLECTOMETER?
A. An instrument used to measure signals
reflected from the Ionosphere.
B. An instrument used to measure radiation resistance.
C. An instrument used to measure transmission line impedance.
D. An instrument used to measure Standing Wave Ratio.
3D-8-1.2 D
What is the device that can indicate an
impedance mismatch in an antenna system?
A. A field strength meter.
B. A set of lecher wires.
C. A wavemeter.
D. A reflectometer.
3D-8-2.1 A
For best accuracy when adjusting the impedance match
between an antenna and feedline, where should the
match indicating device be inserted?
A. At the antenna feedpoint.
B. At the transmitter.
C. At the midpoint of the feedline.
D. Anywhere along the feedline.
3D-8-2.2 C
Where should a reflectometer be inserted into a
long antenna transmission line in order to obtain
the most valid Standing Wave Ratio indication?
A. At any quarter wavelength interval
along the transmission line.
B. At the receiver end.
C. At the antenna end.
D. At any even half wavelength interval
along the transmission line.
3D-9.1 D
When adjusting a transmitter filter circuit, what
device is connected to the transmitter output?
A. A multimeter.
B. A set of Litz wires.
C. A Receiver.
D. A dummy antenna.
3D-9.2 B
What is a DUMMY ANTENNA?
A. An isotropic radiator.
B. A nonradiating load for a transmitter.
C. An antenna used as a reference for gain measurements.
D. The image of an antenna, located below ground.
3D-9.3 C
Of what materials may a dummy antenna be made?
A. A wire-wound resistor.
B. A diode and resistor combination.
C. A noninductive resistor.
D. A coil and capacitor combination.
3D-9.4 B
What station accessory is used in place of an antenna
during transmitter tests so that no signal is radiated?
A. A Transmatch.
B. A dummy antenna.
C. A low-pass filter.
D. A decoupling resistor.
3D-9.5 A
What is the purpose of a DUMMY LOAD?
A. To allow off-the-air transmitter testing.
B. To reduce output power for QRP operation.
C. To give comparative signal reports.
D. To allow Transmatch tuning without causing interference.
3D-9.6 A
How many watts should a dummy load for use
with a 100 watt single-sideband phone transmitter
be able to dissipate?
A. A minimum of 100 watts continuous.
B. A minimum of 141 watts continuous.
C. A minimum of 175 watts continuous.
D. A minimum of 200 watts continuous.
3D-10.1 C
What is an S-METER?
A. A meter used to measure sideband suppression.
B. A meter used to measure spurious
emissions from a transmitter.
C. A meter used to measure relative
signal strength in a receiver.
D. A meter used to measure solar flux.
3D-10.2 A
A meter used to measure relative signal strength
in a receiver is known as what?
A. An S-meter.
B. An RST-meter.
C. A signal deviation meter.
D. An SSB meter.
3D-11-1.1 B
Large amounts of RF energy may cause damage to body tissue,
depending on the wavelength of the signal, the energy
density of the RF field, and other factors. How does
RF energy effect body tissue?
A. It causes radiation poisoning.
B. It heats the tissue.
C. It cools the Tissue.
D. It produces genetic changes in the tissue.
3D-11-1.2 A
Which body organ is most susceptible to damage from the
heating effects of radio frequency radiation?
A. Eyes.
B. Hands.
C. Heart.
D. Liver.
3D-11-2.1 D
Scientists have devoted a great deal of effort to determine
safe RF exposure limits. What organization has established
an RF protection guide?
A. The Institute of Electrical and Electronics Engineers.
B. The American Radio Relay League.
C. The Environmental Protection Agency.
D. The American National Standards Institute.
3D-11-2.2 B
What is the purpose of the ANSI RF protection guide?
A> It protects you from unscrupulous radio dealers.
B. It sets RF exposure limits under certain circumstances.
C. It sets transmitter power limits.
D. It sets antenna height requirements.
3D-11-2.3 B
The American National Standards Institute RF protection guide
sets RF exposure limits under certain circumstances. In what
frequency range is the maximum exposure level the most
stringent (lowest)?
A. 3 to 30 MHz.
B. 30 to 300 MHz.
C. 300 to 3000 MHz.
D. Above 1.5 GHz.
3D-11-2.4 D
The American National Standards Institute RF protection guide
sets RF exposure limits under certain circumstances.
Why is the maximum exposure level the most stringent (lowest)
in the ranges between 30 Mhz and 300 MHz??
A. There are fewer transmitters operating in this
frequency range.
B. There are more transmitters operating in this
frequency range.
C. Most transmissions in this frequency range are
for an extended time.
D. Human body lengths are close to whole-body
resonance in that range.
3D-11-2.5 B
The American National Standards Institute RF protection guide
sets RF exposure limits under certain circumstances. What
is the maximum safe power output to the antenna terminal of a
hand-held VHF or UHF radio, as set by this RF protection guide?
A. 125 milliwatts.
B. 7 watts.
C. 10 watts.
D. 25 watts.
3D-11-3.1 C
After you make internal tuning adjustments to your VHF power
amplifier, what should you do before you turn the amplifier on?
A. Remove all amplifier shielding to ensure maximum cooling.
B. Connect a noise bridge to eliminate any interference.
C. Be certain all amplifier shielding is fastened in place.
D. Be certain no antenna is attached so that you will not
cause any interference.
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