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- FCC General Exam Question Pool. Subelement 3BD.
- Amateur Radio Practice. 5 Questions.
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- 3D 1.5 A
- Which wires in a four conductor line cord should be attached
- to fuses in a 234 VAC primary (Single Phase) power supply?
-
- A. Only the "Hot" (Black and Red) wires.
- B. Only the "Neutral" (White) wire.
- C. Only the "Ground" (Bare) wire.
- D. All wires.
-
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- 3D 1.6 A
- What size wire is normally used on a 15 Ampere,
- 117 VAC household lighting circuit?
-
- A. AWG No. 14.
- B. AWG No. 16.
- C. AWG No. 18.
- D. AWG No. 22.
-
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- 3D 1.7 D
- What size wire is normally used on a 20 Ampere,
- 117 VAC household appliance circuit?
-
- A. AWG No. 20.
- B. AWG No. 16.
- C. AWG No. 14.
- D. AWG No. 12.
-
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- 3D 1.8 C
- What could be a cause of the room lights
- dimming when the transmitter is keyed?
-
- A. RF in the AC pole transformer.
- B. High resistance in the key contacts.
- C. A drop in AC line voltage.
- D. The line cord is wired incorrectly.
-
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- 3D 1.9 D
- What size fuse should be used on a
- #12 wire household appliance circuit?
-
- A. Maximum of 100 amperes.
- B. Maximum of 60 amperes.
- C. Maximum of 30 amperes.
- D. Maximum of 20 amperes.
-
-
- 3D 2.4 B
- What safety feature is provided by a
- BLEEDER RESISTOR in a power supply.
-
- A. It improves voltage regulation.
- B. It discharges the filter capacitors.
- C. It removes shock hazards from the induction coils.
- D. It eliminates Ground Loop current.
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- 3D 3.1 C
- What kind of input signal is used to test the
- amplitude linearity of an emission J3E transmitter
- while vewing the output with an oscilloscope?
-
- A. Normal speech.
- B. An audio frequency sine wave.
- C. Two audio frequency sine waves.
- D. An audio frequency square wave.
-
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- 3D 3.2 C
- To test the amplitude linearity of an emission
- J3E transmitter with an oscilloscope, what
- should the audio input to the transmitter be?
-
- A. Normal speech.
- B. An audio frequency sine wave.
- C. Two audio frequency sine waves.
- D. An audio frequency square wave.
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- 3D 3.3 C
- How are two tones used to test the amplitude
- linearity of an emission J3E transmitter?
-
- A. Two harmonically related audio tones are fed into
- the microphone input of a J3E transmitter, and
- the output is observed on an oscilloscope.
- B. Two harmonically related audio tones are fed into
- the microphone input of a J3E transmitter, and
- the output is observed on a distortion analyzer.
- C. Two nonharmonically related audio tones are fed into
- the microphone input of a J3E transmitter, and
- the output is observed on an oscilloscope.
- D. Two nonharmonically related audio tones are fed into
- the microphone input of a J3E transmitter, and
- the output is observed on a wattmeter.
-
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- 3D 3.4 D
- What audio frequencies are used in a TWO TONE TEST
- of the linearity of an emission J3E transmitter?
-
- A. 20 Hz. and 20,000 Hz. tones must be used.
- B. 1200 Hz. and 2400 Hz. tones must be used.
- C. Any two audio tones may be used,
- if they are harmonically related.
- D. Any two audio tones may be used, but they
- must be within the transmitter audio passband,
- and should not be harmonically related.
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- 3D 3.5 D
- What can be determined by making a
- TWO TONE TEST using an oscilloscope?
-
- A. The percent of frequency modulation.
- B. The percent of carrier phase shift.
- C. The frequency deviation.
- D. The amplifier linearity.
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- 3D 4.1 A
- How can the Grid Current meter in a power amplifier
- be used as a neutralizing indicator?
-
- A. Tune for minimum change in Grid Current
- as the output circuit is changed.
- B. Tune for maximum change in Grid Current
- as the output circuit is changed.
- C. Tune for minimum grid current.
- D. Tune for maximum grid current.
-
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- 3D 4.2 D
- Why is Neutralization in some Vacuum Tube amplifiers necessary?
-
- A. To reduce the limits of loaded Q
- in practical tuned circuits.
- B. To reduce grid to cathode leakage.
- C. To cancel acid build-up caused by thorium oxide gas.
- D. To cancel oscillation caused by the
- effects of interelectrode capacitance.
-
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- 3D 4.3 C
- How is Neutralization of an RF Amplifier accomplished?
-
- A. By supplying energy from the amplifier output
- to the input on alternate half cycles.
- B. By supplying energy from the amplifier output
- to the input shifted 360 degrees out of phase.
- C. By supplying energy from the amplifier output
- to the input shifted 180 degrees out of phase.
- D. By supplying energy from the amplifier output
- to the input with a proper DC bias.
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- 3D 4.4 B
- What purpose does a neutralization
- circuit serve in an RF Amplifier?
-
- A. It controls differential gain.
- B. It cancels the effects of positive feedback.
- C. It eliminates circulating currents.
- D. It reduces incidental grid modulation.
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- 3D 4.5 B
- What is the reason for neutralizing the
- final amplifier stage of a transmitter?
-
- A. To limit the modulation index.
- B. To eliminate parasitic oscillations.
- C. To cut off the final amplifier during standby periods.
- D. To keep the carrier on frequency.
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- 3D 5.1 B
- How can the PEP Output of a transmitter
- be determined with an oscilloscope?
-
- A. Measure peak load voltage across a resistive load
- with an oscilloscope, and calculate, using
- PEP = [(Vp)(Vp)]/(Rl).
- B. Measure peak load voltage across a resistive load
- with an oscilloscope, and calculate, using
- PEP = [(0.707 PEV)(0.707 PEV)]/Rl.
- C. Measure peak load voltage across a resistive load
- with an oscilloscope, and calculate, using
- PEP = (Vp)(Vp)(Rl).
- D. Measure peak load voltage across a resistive load
- with an oscilloscope, and calculate, using
- PEP = [(1.414 PEV)(1.414 PEV)]/Rl.
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- 3D 5.5 A
- What is the Output PEP from a transmitter when an
- oscilloscope shows 200 Volts Peak to Peak across a 50 Ohm
- resistor connected to the transmitter output terminals?
-
- A. 100 watts.
- B. 200 watts.
- C. 400 watts.
- D. 1000 watts.
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- 3D 5.6 B
- What is the Output PEP from a transmitter when an
- oscilloscope shows 500 Volts Peak to Peak across a 50 Ohm
- resistor connected to the transmitter output terminals?
-
- A. 500 watts.
- B. 625 watts.
- C. 1250 watts.
- D. 2500 watts.
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- 3D 5.7 B
- What is the output PEP from a N0N transmitter
- when an average reading wattmeter connected to the
- transmitter output terminals indicates 1060 watts?
-
- A. 530 watts.
- B. 1060 watts.
- C. 1500 watts.
- D. 2120 watts.
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- 3D 6.1 D
- What item of test equipment contains
- horizontal and vertical channel amplifiers?
-
- A. The ohmmeter.
- B. The signal generator.
- C. The ammeter.
- D. The oscilloscope.
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- 3D 6.2 A
- What types of signals does an oscilloscope measure?
-
- A. Any time dependent signal within the
- bandwith capability of the instrument.
- B. Blinker light signals from ocean going vessels.
- C. International nautical flag signals.
- D. Signals created by aeronautical flares.
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- 3D 6.3 D
- What is an OSCILLOSCOPE?
-
- A. An instrument that displays
- radiation resistance of an antenna.
- B. An instrument that displays the SWR on a feed line.
- C. An instrument that displays the resistance in a circuit.
- D. An instrument that displays signal waveforms.
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- 3D 6.4 B
- What can cause phosphor damage to an oscilloscope CRT?
-
- A. Directly connecting deflection electrodes to the CRT.
- B. Too high an intensity setting.
- C. Overdriving the vertical amplifier.
- D. Improperly adjusted focus.
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- 3D 9.1 C
- What is a SIGNAL TRACER?
-
- A. A Directional Finding antenna.
- B. An aid for following schematic diagrams.
- C. A device for detecting signals in a circuit.
- D. A device for drawing signal waveforms.
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- 3D 9.2 A
- How is a signal tracer used?
-
- A. To detect the presence of a signal
- in the various stage of a receiver.
- B. To locate a source of interference.
- C. To trace the path of a radio signal
- through the Ionosphere.
- D. To draw a wave form on paper.
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- 3D 9.3 D
- What is a signal tracer normally used for?
-
- A. To identify the source of radio transmissions.
- B. To make exact replicas of signals.
- C. To give a visual indication of standing waves
- on open-wire feedlines.
- D. To identify an inoperative stage in a radio receiver.
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- 3D 10.1 B
- What is the most effective way to reduce or eliminate
- Radio Frequency Interference to home entertainment systems?
-
- A. Install bypass inductors.
- B. Install bypass capacitors.
- C. Install metal oxide varistors.
- D. Install bypass resistors.
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- 3D 10.2 B
- What should be done when a properly operating
- Amateur Radio Station is the source of
- interference to a nearby telephone?
-
- A. Make internal adjustments to the telephone equipment.
- B. Contacting a phone service representative
- about installing RFI filters.
- C. Nothing can be done to cure the interference.
- D. Ground and shield the local
- telephone distribution amplifier.
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- 3D 10.3 C
- What type of sound would be heard from a public
- address system when audio rectification occurs in
- response to a nearby emission J3E transmitter?
-
- A. A steady hum that persists while the
- transmitter's carrier is on the air.
- B. On and Off humming or clicking.
- C. Distorted speech from the transmitter's signals.
- D. Clearly audible speech from the transmitter's signals.
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- 3D 10.4 C
- How can the possibility of Audio Rectification
- occuring be minimized?
-
- A. By using a solid state transmitter.
- B. By using CW emission only.
- C. By ensuring all station equipment is properly grounded.
- D. By using AM emission only.
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- 3D 10.5 A
- What type of sound would be heard from a public
- address system when audio rectification occurs in
- response to a nearby emission A3E transmitter?
-
- A. Audible, possibly distorted speech
- from the transmitter signals.
- B. On and Off humming or clicking.
- C. Muffled, distorted speech from the transmitter's signals.
- D. Extremely loud, slightly distorted speech
- from the transmitter's signals.
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- 3D 12.2 D
- What is the reason for using a Speech
- Processor with an emission J3E transmitter?
-
- A. A properly adjusted Speech processor
- reduces average transmitter power requirements.
- B. A properly adjusted Speech processor
- reduces unwanted noise pickup from the microphone.
- C. A properly adjusted Speech processor
- improves voice frequency fidelity.
- D. A properly adjusted Speech processor
- improves signal intelligibility at the receiver.
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- 3D 12.3 B
- When a transmitter is 100% modulated, will a
- speech processor increase the PEP output?
-
- A. Yes.
- B. No.
- C. It will decrease the transmitter's peak power output.
- D. It will decrease the transmitter's average power output.
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- 3D 12.4 C
- Under which band conditions should a
- Speech Processor not be used?
-
- A. When there is high atmospheric noise on the band.
- B. When the band is crowded.
- C. When the frequency in use is clear.
- D. When the sunspot count is relatively high.
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- 3D 12.5 D
- What effect can result from using a Speech Processor
- with an emission J3E transmitter?
-
- A. A properly adjusted Speech processor
- reduces average transmitter power requirements.
- B. A properly adjusted Speech processor
- reduces unwanted noise pickup from the microphone.
- C. A properly adjusted Speech processor
- improves voice frequency fidelity.
- D. A properly adjusted Speech processor
- improves signal intelligibility at the receiver.
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- 3D 13.1 A
- At what point in the coaxial line should an
- electronic T-R switch be installed?
-
- A. Between the transmitter and low-pass filter.
- B. Between the low-pass filter and antenna.
- C. Between the antenna and feed point.
- D. Right after the low-pass filter.
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- 3D 13.2 C
- Why is an electronic T-R switch preferable to a mechanical one?
-
- A. Greater receiver sensitivity.
- B. Circuit simplicity.
- C. Higher operation speed.
- D. Cleaner output signals.
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- 3D 13.3 D
- What station accessory facilitates QSK operation?
-
- A. Oscilloscope.
- B. Audio CW filter.
- C. Antenna relay.
- D. Electronic T/R switch.
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- 3D 14.6 B
- What is an antenna NOISE BRIDGE?
-
- A. An instrument for measuring the noise figure
- of an antenna or other electrical circuit.
- B. An instrument for measuring the impedance
- of an antenna or other electrical circuit.
- C. An instrument for measuring solar flux.
- D. An instrument for tuning out noise in a receiver.
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- 3D 14.7 C
- How is an antenna NOISE BRIDGE used?
-
- A. It is connected at the antenna feed point,
- and the noise is read directly.
- B. It is connected between a transmitter and
- an antenna and tuned for minimum SWR.
- C. It is connected between a receiver and an unknown
- impedance and tuned for minimum noise.
- D. It is connected between an antenna and a Transmatch and
- adjusted for minimum SWR.
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- 3D 15.1 B
- How does the emitted waveform from a properly adjusted
- emission J3E transmitter appear on a monitoring oscilloscope?
-
- A. A vertical line.
- B. A waveform that mirrors the input waveform.
- C. A square wave.
- D. Two loops at right angles.
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- 3D 15.2 A
- What is the best instrument for checking transmitted
- signal quality from an emissions A1A/J3E transmitter?
-
- A. A monitor oscilloscope.
- B. A field strength meter.
- C. A sidetone monitor.
- D. A diode probe and an audio amplifier.
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- 3D 15.3 B
- What is a MONITORING OSCILLOSCOPE?
-
- A. A device used by the FCC to detect out-of-band signals.
- B. A device used to observe the waveform
- of a transmitted signal.
- C. A device used to display SSTV signals.
- D. A device used to display signals in a receiver IF stage.
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- 3D 15.4 D
- How is a monitoring oscilloscope connected in a station in
- order to check the quality of the transmitted signal?
-
- A. Connect the receiver IF output to the
- vertical deflection plates of the oscilloscope.
- B. Connect the transmitter audio input
- to the oscilloscope vertical input.
- C. Connect a receiving antenna directly
- to the oscilloscope vertical input.
- D. Connect the transmitter output to the
- vertical deflection plates of the oscilloscope.
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- 3D 17.2 A
- What is the most appropriate instrument to use when
- determining antenna horizontal radiation patterns?
-
- A. A field strength meter.
- B. A grid-dip meter.
- C. A wave meter.
- D. A vacuum-tube voltmeter.
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- 3D 17.3 C
- What is a FIELD-STRENGTH METER?
-
- A. A device for determining the Standing
- Wave Ratio on a transmission line.
- B. A device for checking modulation
- on the output of a transmitter.
- C. A device for monitoring relative RF output.
- D. A device for increasing the average transmitter output.
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- 3D 17.4 A
- What is a simple instrument that can be useful for monitoring
- relative rf output during antenna and transmitter adjustments?
-
- A. A field-strength meter.
- B. An antenna noise bridge.
- C. A multimeter.
- D. A Transmatch.
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- 3D 17.5 B
- When the power output from a transmitter
- is increased by four times how should the
- S-meter reading on a nearby receiver change?
-
- A. Decrease by approximately one S-unit.
- B. Increase by approximately one S-unit.
- C. Increase by approximately four S-units.
- D. Decrease by approximately four S-units.
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- 3D 17.6 C
- How many times must the power output from a transmitter
- change to raise the S-meter reading on a nearby receiver
- from S-8 to S-9?
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- A. Approximately 2 times.
- B. Approximately 3 times.
- C. Approximately 4 times.
- D. Approximately 5 times.
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- End of Subelement 3BD.
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