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- FCC Technician Exam Question Pool. Subelement 3AD.
- Amateur Radio Practice. 4 Questions.
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- 3D 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.
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- 3D 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 1.3 B
- Where should the White wire in
- a three wire line cord be attached in a power supply.
-
- A. To the fuse.
- B. To one side of the transformer's primary winding.
- C. To the Black wire.
- D. To the rectifier junction.
-
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- 3D 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.
-
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- 3D 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.
-
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- 3D 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.
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- 3D 2.3 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.
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- 3D 2.5 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.
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- 3D 5.2 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.
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- 3D 5.3 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.
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- 3D 5.4 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.
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- 3D 7.1 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.
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- 3D 7.2 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 parallel to the circuit under test.
- C. By adding resistance in series with the meter.
- D. By adding resistance parallel to the meter.
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- 3D 7.3 B
- How is a voltmeter typically connected to a circuit?
-
- A. In series with the circuit.
- B. In parallel with the circuit.
- C. In quadrature with the circuit.
- D. In phase with the circuit.
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- 3D 7.4 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 parallel to the circuit under test.
- C. By adding resistance in series with the meter.
- D. By adding resistance parallel to the meter.
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- 3D 8.1 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.
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- 3D 8.2 D
- What piece of test equipment provides a variable
- frequency signal which can be used to check
- the frequency responce of a curcuit?
-
- A. Frequency Counter.
- B. Distortion Meter.
- C. Deviation Meter.
- D. Signal Generator.
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- 3D 8.3 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.
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- 3D 8.4 A
- How is a MARKER GENERATOR used?
-
- A. To calibrate the tuning dial on a receiver.
- many frequencies simultaneously.
- 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.
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- 3D 8.5 D
- When adjusting a transmitter filter circuit, what
- device is connected to the transmitter output?
-
- A. Multimeter.
- B. Litz wires.
- C. Receiver.
- D. Dummy antenna.
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- 3D 11.1 B
- What is a REFLECTOMETER?
-
- A. An instrument used to measure signals
- reflecter from the Ionosphere.
- B. An instrument used to measure Standing Wave Ratio.
- C. An instrument used to measure transmission line impedance.
- D. An instrument used to measure radiation resistance.
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- 3D 11.2 A
- For best accuracy when adjusting the impedance match
- between an antenna and feedline, where should the
- match indicating device be inserted for best accuracy?
-
- A. At the antenna feedpoint.
- B. At the transmitter.
- C. At the midpoint of the feedline.
- D. Anywhere along the feedline.
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- 3D 11.3 D
- What is the device that can indicate
- impedance mismatches in an antenna system?
-
- A. A field strength meter.
- B. A set of lecher wires.
- C. A wavemeter.
- D. A reflectometer.
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- 3D 11.4 B
- What is a REFLECTOMETER?
-
- A. An instrument used to measure signals
- reflecter from the Ionosphere.
- B. An instrument used to measure Standing Wave Ratio.
- C. An instrument used to measure transmission line impedance.
- D. An instrument used to measure radiation resistance.
- D. An instrument used to measure radiation resistance.
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- 3D 11.5 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.
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- 3D 12.1 B
- What result might be expected when using a
- Speech Processor with an emission J3E transmitter?
-
- A. A lower plate-current reading.
- B. A less natural-sounding voice.
- C. A cooler operating power supply.
- D. Greater PEP output.
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- 3D 14.1 B
- What is a TRANSMATCH?
-
- A. A device for varying the resonant frequency of an antenna.
- B. A device for varying the impedance presented
- to the transmitter.
- C. A device for varying the tuning rate of the transmitter.
- D. A device for varying the electrical length of an antenna.
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- 3D 14.2 D
- What is BALANCED LINE?
-
- A. Feed line with one conductor connected to ground.
- B. Feed line with both conductors connected
- to ground to balance out harmonics.
- C. Feed line with the outer conductor connected
- to ground at even intervals.
- D. Feed line with neither conductor connected to ground.
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- 3D 14.3 C
- What is an UNBALANCED LINE?
-
- A. Feed line with neither conductor connected to ground.
- B. Feed line with both conductors connected
- to ground to balance out harmonics.
- C. Feed line with one conductor connected to ground.
- D. Feed line with the outer conductor connected
- to ground at even intervals.
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- 3D 14.4 A
- What is a BALUN?
-
- A. A device for using an unbalanced line to supply power
- to a balanced load, or vice versa.
- B. A device to match impedances between two coaxial lines.
- C. A device used to connect a microphone
- to a balanced modulator.
- D. A counterbalance used with an
- azimuth/elevation rotator system.
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- 3D 14.5 D
- What is the purpose of an Antenna Matching Circuit?
-
- A. To measure the impedance of the antenna.
- B. To compare the radiation patterns of two antennas.
- C. To measure the SWR of an antenna.
- D. To match impedances within the antenna system.
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- 3D 14.8 A
- How is a TRANSMATCH used?
-
- A. It is connected between a transmitter and an antenna
- system, and tuned for minimum SWR at the transmitter.
- B. It is connected betwen a transmitter and an antenna
- system and tuned for minimum SWR at the antenna.
- C. It is connected between a transmitter and an antenna
- system, and tuned for minimum impedance.
- D. It is connected between a transmitter and a dummy load,
- and tuned for maximum output power.
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- 3D 16.1 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.
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- 3D 16.2 B
- Of what material may a dummy antenna be made?
-
- A. A wire-wound resistor.
- B. A noninductive resistor.
- C. A diode and resistor combination.
- D. A coil and capacitor combination.
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- 3D 16.3 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.
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- 3D 16.4 A
- What is the purpose of a DUMMY ANTENNA?
-
- 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 interfefence.
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- 3D 16.5 A
- How many Watts should a dummy load for use
- with a 100 Watt emission J3E transmitter
- with 50 ohm output 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.
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- 3D 17.1 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.
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- 3D 18.1 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.
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- 3D 18.2 B
- At what impedance are RF Wattmeters usually designed to operate?
-
- A. 25 Ohms.
- B. 50 Ohms.
- C. 100 Ohms.
- D. 300 Ohms.
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- 3D 18.3 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.
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- End of Subelement 3AD.
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