3D153 Vol 1

1. (001) What are the three general categories used to produce modulation in radio frequency (RF) transmission today?

Binary amplitude shift keying, frequency shift keying, and phase shift keying.

Pulse amplitude, pulse width, and pulse position.

Amplitude, frequency, and phase.

Analog, digital and shift keying.

2. Who is initially responsible for reporting an electromagnetic interference?

The operator.

Major command.

The frequency manager.

Federal Communications Commission.

3. Which feature of the Fluke 8025A multimeter do you use to select various measurementfunctions?

Circuit jacks.

Rotary switch.

Range push button.

Touch-hold button.

4. What are the three main functions of grounding?

Personnel safety, equipment protection, and noise reduction.

Signal amplification, personnel safety, and emissions security.

Equipment protection, signal amplification, and capacitance reaction.

Corrosion prevention, emissions security, and over-voltage protection.

5. (002) When the modulating signal and carrier signal are combined within a modulator, the output signal contains

Modulating signal, upper sideband, and lower sideband.

Carrier, upper sideband, and lower sideband.

Upper sideband and modulating signal.

Carrier and modulating signal.

6. In asynchronous transmissions, what bit is used by the receiving device to verify that thetransmission was received correctly?

Control

Parity

Start

Stop

7. Which repeater amplifies optical signal without converting to and from the electricaldomain?

Receiver

Repeaters

Regenerators

Optical amplifiers

8. What area of a digital storage oscilloscope takes digitized samples and performs numerousmanipulations on the data including measuring rise and fall times, periods, time intervals, andmath computations?

Microprocessors.

Aquisition

Memory

Input

9. How often must you continue to test system grounds?

Randomly.

Periodically.

Every 10 years.

Just one time only.

10. What type of equipment helps resolve intermittent electrical problems because of poorgrounding?

Earth ground tester.

Frequency counter.

Spectrum analyzer

Oscilloscope

11. A power reading that uses the abbreviation dBm indicates the

Ratio of decibels relative to a 1-milliwatt standard.

Ratio of decibels relative to a 1-megawatt standard.

Actual power level expressed in milliwatts.

Actual power level expressed in megawatts.

12. What type of uninterruptible power supply (UPS) has traditionally been referred to as"offline" by technicians?

Passive standby.

Line interactive.

Double conversion

Ferro resonant standby.

13. What is the formula to find the modulating index?

Deviation divided by frequency of modulation.

Deviation times frequency of modulation.

Sideband divide by carrier frequency.

Sideband times carrier frequency.

14. What is it called when a narrow frequency band between adjacent stations preventfrequency modulated sidebands from overlapping?

Space.

Guard band.

Buffer zone.

Prevention field.

15. In phase modulation, what part of the carrier signal is varied?

Frequency

Amplitude

Height

Phase

16. Light sources that are applicable to fiber optic waveguide are light-emitting diodes and

Photo transistors.

Hybrid photodiodes.

Semiconductor laser diodes.

Integrated photodiode/preamplifiers.

17. What photo detector converts one photon to one electron?

Light emitting diode.

Avalanche photodiode.

Positive intrinsic negative diode.

Integrated photodiode/preamplifier.

18. Atmospheric disturbances from initial nuclear radiation on higher frequencies affectcommunications by

Blackout effects.

Absorption effects.

Scintillation effects.

Attenuation effects.

19. If the interference can be eliminated by disconnecting the receiving antenna, the source ofthe disturbance is most likely

Line noise.

Internal to the radio.

External to the radio.

Radio receiver trouble.

20. Little or no variations in the strength of the interfering signal when moving the receivingantenna for short distance normally indicates

Enemy jamming.

Internal interference.

Radio receiver trouble.

Unintentional interference.

21. What Air Force program is used to resolve an electromagnetic interference incident?

Mishap prevention.

Frequency management.

Electrostatic discharge control.

Spectrum interference resolution.

22. At what level does the Air Force want electromagnetic interference problems resolved?

Affected unit.

Affected major command.

Electromagnetic environmental effects office.

Spectrum interference resolution office.

23. Which feature of the Fluke 8025A locks the measurement into the display for viewing andautomatically updates the display when you take a new measurement?

Rotary switch.

Range push button.

Power-up self-test.

Touch-hold push button.

24. When you use the Fluke 8025A, which voltage range do you select to measure 50 volts DC?

Volts AC

Volts DC

Millivolts AC.

Millivolts DC.

25. When testing a diode with the 8025A, the leads across a "good" diode produces an "OL"(open) on the display in one direction while reversing the leads produces

A continuous audible tone.

"SL" (short) on the display.

A wavering audible tone.

Three short beeps.

26. Which of these bit rates do you use for a bit error rate test on a 64 kbps data circuit?

511 bps.

9600 bps.

64 kbps.

1.544 Mbps.

27. What are the two basic functions of shielding?

Prevent interference between multiple emanating systems and minimize compromisingemanations.

Prevent interference between multiple emanating systems and block all emanations fromexiting a secure facility.

To equalize all electronic systems to the same potential and minimize compromisingemanations.

To equalize all electronic systems to the same potential and block all emanations from exiting asecure facility.

28. What power line fault category is more typically referred to as Electro-Magnetic
Interference and Radio Frequency Interference?

Sag.

Spike.

Noise.

Blackout.

29. Which statement concerning bandwidth is true?

Overmodulating increases bandwidth because the distortion produces harmonics.

Undermodulating increases bandwidth because the distortion produces harmonics.

Overmodulating increases bandwidth because the output's increased amplitude.

Undermodulating increases bandwidth because the output's decreased amplitude.

30. In frequency modulation, a significant sideband contains at least what percentage of the totaltransmitted power?

1.

3.

10.

0.1.

31. A 5 kHz modulating signal has enough peak voltage to cause a deviation of 15 kHz. What isthe modulation index?

5

0.5

0.3

3

32. If an error should occur, what transmission is lost in an synchronous transmission?

One character.

Block of data.

A parity bit.

A stop bit.

33. When using vertical redundancy check, what significance does the amount of ones have in adata bit pattern?

Determines parity.

Determines transmission rate.

Determines whether transmission is in ASCII format.

Determines whether transmission is synchronous or asynchronous.

34. When using forward error control as a method of error correction, where does errorcorrection take place?

Receiving end.

In the oscillator.

Transmitting end.

In the primary buffers.

35. Which fiber-optic connector uses quick-release, keyed bayonet couplings that are preferredin situations where severe vibrations are not expected?

Biconic

Field (FC).

Straight tip (ST).

Sub-miniature, type A (SMA).

36. A system-generated electromagnetic pulse is a problem for satellites and reentry vehiclesthat are

Susceptible to the wideband frequency phenomenon.

Directly exposed to nuclear radiations from a high-altitude burst.

Affected by the azimuthal magnetic fields and time-varying air conductivity.

Influenced by the signal fading or waveform distortion caused by the structured plasma field.

37. What man-made noise results from voltage surges, arcing, or corona discharges?

Relays

Lighting

Power line

Switching equipment

38. Who is tasked to provide interference resolution support to the unified commanders?

The operator.

Joint spectrum center.

Installation spectrum manager.

Federal Communications Commission.

39. Resistance reading on the ground under test is plotted on a graph of

Resistance versus distance.

Current versus distance.

Frequency versus time.

Amplitude versus time.

40. What operational capability of the communication service monitor produce sine, square andtriangle waveforms?

Scope.

Duplex.

Receiver.

Function generator.

41. (001) What is one reason for modulation that involves modulating low frequency signals for transmission over long distances?

Spectrum conservation.

Channel Allocation

Ease of Radiation

Companding.

42. (002) If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator, the output signal include

1.01 MHz, 1 MHz, and 0.99 MHz.

1.1 MHz, 1 MHz, and 0.9 MHz.

1.11 MHz, 1 MHz, 0.99 MHz.

1.111 MHz, 1 MHz, 0.999 MHz.

43. (002) The bandwidth of an amplitude modulated signal is

Two times the modulating signal

The same as the modulating signal.

Determined by the modulation index.

Defined in terms of maximum amount of modulation.

44. What part of the pulse code modulation process converts a continuous time signal into adiscrete time signal?

Sampling.

Rectifying

Oscillating

Band limiting

45. What type of light is emitted from a laser?

Incoherent.

Coherent.

Ordinary

Invisible

46. What do you do when you are reasonably sure electromagnetic interference exists?

Request engineering assistance.

Contact the base frequency manager.

Systematically gather data for analysis.

Contact the spectrum interference resolution office.

47. Which probe does not need to actually make contact with the circuit under test?

Current.

Passive 1:1.

Active (FET).

Passive divider, 10:1.

48. The two switches on the front panel of the wattmeter correspond to the

Power range of the reverse element.

Power range of the forward element.

Frequency range of the reverse element.

Frequency range of the forward element.

49. Why should the number of splices be controlled during fiber optic installation?

Prevent eavesdropping.

To aid in troubleshooting.

Reduce potential damage.

Minimize transmission loss.

50. How many phases of generator power are usually required for industrial and commercialapplications?

Single.

Double.

Three.

Four.

51. How are voltage, time, and depth represented on the oscilloscope display?

Voltage = intensity, time = vertical axis, and depth = horizontal axis.

Voltage = intensity, time = horizontal axis, and depth = vertical axis.

Voltage = horizontal axis, time = vertical axis, and depth = intensity.

Voltage = vertical axis, time = horizontal axis, and depth = intensity.

52. What type of sampling does a digital storage oscilloscope normally use on single-shot orseldom-occurring signals?

Sequential.

Repetitive.

Real-time.

Random.

53. What function is not part of the communication service monitor?

Radio frequency generator.

Analog multimeter.

Oscilloscope.

Receiver.

54. What operational capability of the communication service monitor receives amplitude andfrequency modulated signals?

Scope.

Receiver.

Generator.

Function generator.

55. Which one do you like?

Option 1

Option 2

Option 3

Option 4

56. A short section of single fiber cable that has a connector at each end is called a

Pigtail.

Jumper

Patch cord

Breakout cables

57. Which type of filters are always used in combination with surge arresters?

Linear

AC Line

DC line

Power line

58. Which type of intermodulation interference varies significantly with temperature andweather conditions?

Transmitter.

Rusty-bolt.

Spurious.

Receiver.

59. What are the two main types of photodetectors?

Positive intrinsic negative and avalanche photodiode.

Light-emitting diode and avalanche photodiode.

Light emitting diode and semiconductor laser.

Tunnel and zener diodes.

60. What component of a protocol analyzer discards frames based on its definition or activates atrigger based on the trigger definition?

Filter.

Buffer.

Counter.

Central processing unit.

61. During what operation is the radio frequency blanking output used on the HP 436A powermeter?

While in WATT mode operation.

While in REMOTE mode operation.

During the automatic zeroing operation.

During calibration adjustment operation.

62. What feature is useful for making adjustments to optimize any of the parameters which thewattmeter measures?

Peaking aid.

Minimum reading.

Maximum reading.

Standing wave ratio.

63. (002) Use the formula on page 1–3. If an oscilloscope displays a modulation envelope having an Emax of 200 volts and an Emin of 20 volts, what is the modulation percentage?

81.8

85.5

88

122

64. In phase modulation, the carrier's

Phase is shifted at the rate of the modulating signal.

Phase shifted with the phase of the modulating signal.

Amplitude is shifted at the rate of the modulating signal.

Amplitude is shifted with the phase of the modulating signal.

65. What is the first step in the pulse code modulation process?

Discrete amplitudes are assigned to the sampling pulses.

A binary code number is assigned to the sample.

The quantizer limits the amplitude of the pulses.

The analog signal is band limited.

66. Currents and voltages induced on power lines, cable links, and pipelines by electromagneticpulse are called

Scintillation.

Local effects

Source region

Long-line effects

67. What type of electromagnetic interference occurs when a receiver responds to off-frequencysignals?

Rusty bolt.

Co-channel.

Brute force.

Spurious responses.

68. How can you normally eliminate electromagnetic interference noise bursts caused bysodium and mercury vapor lights that have stopped working while the power is still applied?

Change the bulb.

Ground out the light fixture.

Install a noise reject filter on the light.

Install a noise reject filter on the receiver.

69. Sampled data points are stored in the memory of a digital storage oscilloscope as

Sequential records.

Waveform points.

Record lengths.

Record points.

70. Which is the primary means of measuring the quality of transmitted digital information, andhow is this means derived?

Bit error rate (BER), the ratio of the number of bits in error to total number of bits transmitted.

Bit error rate (BER), the difference between the number of bits transmitted and the totalnumber of bits received.

Distribution of errors, the ratio of the number of bits in error to total number of bits transmitted.

Distribution of errors, the difference between the number of bits transmitted and the totalnumber of bits received.

71. What protocol analyzer test window provides information concerning the networkutilization and frame error that are related to a specific protocol?

Media Access Control (MAC) node statistics.

Connection statistics.

Protocol statistics.

Node discovery.

72. What protocol analyzer test window provides information concerning the bandwidthutilization and the number of connections that are related to specific nodes?

Media Access Control (MAC) node statistics.

Connection statistics.

Protocol statistics.

Node discovery.

73. What kind of bonds are normally applied to signal reference bonds?

None

Brazing

Welding

Mechanical

74. What error detection method is used for checking a data block greater than 512 and is about99 percent effective in most applications?

Checksum.

Cyclic redundancy check

Vertical redundancy check.

Longitudinal redundancy check.

75. High-altitude electromagnetic pulse is a wideband phenomenon that involves whichfrequency range?

1 hertz to 1 kilohertz.

1 hertz to 1 gigahertz.

10 hertz to 10 kilohertz.

10 hertz to 10 gigahertz.

76. High-altitude electromagnetic pulse environment protection is important for critical, timeurgent mission systems because it

Is a problem for electronic components in satellites and reentry vehicles.

Has a vertical amplitude that decreases inversely with distance, but remains significant formany kilometers.

Has very intense radial electrical fields, azimuthal magnetic fields, and time-varying airconductivity.

Is the only nuclear environment that may be imposed on many systems simultaneously with theexpenditure of very few weapons.

77. Which oscilloscope probe is essentially just a shielded piece of wire?

Current.

Passive 1:1.

Passive divider, 1:10.

Active field effect transistor.

78. What facility ground subsystem uses surge arrestors?

The earth electrode.

The fault protection.

The signal reference.

The lightning protection.

79. What equipment should be designated as RED?

Equipment processing unencrypted unclassified information.

Equipment processing clear-text unclassified information.

Equipment processing encrypted classified information.

Equipment processing clear-text classified information.

80. Which distinct region of the source region electromagnetic pulse is produced by theinteractions between the weapon products and the earth's atmosphere?

Secondary

Radiated

Plasma

Source

81. In real-time sampling, what type of interpolation is used when measuring pulse waves?

Sine.

Linear.

Non-uniform

Companding.

82. Which part of the Fluke 8025A's display section indicates the absolute value of the input?

Digital.

Annunciator.

Range indicator.

Analog bar graph.

83. Which one of these is not an application of a radio frequency generator?

Verifying transmitter frequencies.

Troubleshooting receivers.

Checking antenna systems.

Aligning galvanometers.

84. The measurable frequency and power ranges of the HP 436A power meter are determinedby the

Digital display.

Power sensor.

Power meter.

Interface.

85. Bonds in the earth electrode subsystem normally are direct permanent bonds and do notexceed a resistance of

1 milliohm.

2 milliohm.

5 milliohm.

10 milliohm.

86. Which of these is considered a primary cell?

Nickel cadmium.

Carbon zinc.

Lead-acid.

Lithium.

87. Which probe lets you use the oscilloscope to measure higher voltage levels, raises the inputimpedance, does not require a bias voltage, and attenuates noise?

Current.

Passive 1:1.

Active (FET).

Passive divider, 10:1.

88. In acquiring a 4K record length on a digital storage oscilloscope, how many samples canyou view at one time?

1,000

2,000

3,000

4,000

89. What pattern simulator section of the bit error rate test set accepts a 48-bit parallel word andgenerates a serial pattern?

48-bit transmitter only.

48-bit register and 8-bit word display.

Pseudo random noise (PRN) generator.

Pseudo random noise (PRN) comparator.

90. On the bit error rate test set, the 25-pin connectors are designed to operate with datamodems to

Simplify connection of test equipment to the modem under test and to transmit the test pattern.

Isolate test equipment from the data circuit under test and to transmit the test pattern.

Isolate test equipment from the data circuit under test and to carry the necessary signaling andhandshake signals for modem operations.

91. Which electronic counter measurement represents the average bit-to-bit time of an inputsignal?

Period.

Scaling.

Frequency

Time interval.

92. The output of the oscillator in a frequency modulation (FM) modulator increases infrequency with each

Positive half cycle of the carrier.

Negative half cycle of the carrier.

Positive half cycle of the modulating signal.

Negative half cycle of the modulating signal.

93. Which pattern simulator section of a bit error rate test set controls the clock selector andselects either the external clock or the internal clock for processing?

Clock drivers.

Code converter.

Data/sync selector.

Data/clock select encoder.

94. Which is a function of Air Force Communications Special Instructions?

Permanently change technical order procedures.

Means to issue optional equipment modifications.

Provide significant system repair history for equipment transfers.

Paraphrases technical order procedures via quick reference index cards.

95. Which measurement is not made with a spectrum analyzer?

Frequency stability.

Peak-peak voltage.

Amplitude modulation.

Subcarrier oscillator outputs.

96. Which are the correct four classes of electronic counters?

Frequency counters, time counters, microwave counters, and reciprocal counters.

Frequency counters, universal counters, microwave counters, and reciprocal counters.

Frequency counters, universal counters, period counters, and reciprocal counters.

Scaling counters, universal counters, microwave counters, and reciprocal counters.

97. Which oscilloscope's input coupling position allows you to view both AC and DCcomponents of the input signal?

DC

AC

Norm

Ground

98. A known current is generated by the earth ground tester between the earth ground electrodeand the

Grounding point.

Inner earth stake Y.

Auxiliary current probe.

Auxiliary potential probe.

99. What facility ground subsystem is also called the safety ground?

The earth electrode.

The fault protection.

The signal reference.

The lightning protection.

100. What protocol analyzer test window automatically runs in the background when theprotocol analyzer application is activated?

Media Access Control (MAC) node statistics.

Connection statistics.

Protocol statistics.

Node discovery.

3D153 Vol 1

1. (001) What are the three general categories used to produce modulation in radio frequency (RF) transmission today?

2.

What first name or nickname would you like us to use?

2. Who is initially responsible for reporting an electromagnetic interference?

3. Which feature of the Fluke 8025A multimeter do you use to select various measurementfunctions?

4. What are the three main functions of grounding?

5. (002) When the modulating signal and carrier signal are combined within a modulator, the output signal contains

6. In asynchronous transmissions, what bit is used by the receiving device to verify that thetransmission was received correctly?

7. Which repeater amplifies optical signal without converting to and from the electricaldomain?

8. What area of a digital storage oscilloscope takes digitized samples and performs numerousmanipulations on the data including measuring rise and fall times, periods, time intervals, andmath computations?

9. How often must you continue to test system grounds?

10. What type of equipment helps resolve intermittent electrical problems because of poorgrounding?

11. A power reading that uses the abbreviation dBm indicates the

12. What type of uninterruptible power supply (UPS) has traditionally been referred to as"offline" by technicians?

13. What is the formula to find the modulating index?

14. What is it called when a narrow frequency band between adjacent stations preventfrequency modulated sidebands from overlapping?

15. In phase modulation, what part of the carrier signal is varied?

16. Light sources that are applicable to fiber optic waveguide are light-emitting diodes and

17. What photo detector converts one photon to one electron?

18. Atmospheric disturbances from initial nuclear radiation on higher frequencies affectcommunications by

19. If the interference can be eliminated by disconnecting the receiving antenna, the source ofthe disturbance is most likely

20. Little or no variations in the strength of the interfering signal when moving the receivingantenna for short distance normally indicates

21. What Air Force program is used to resolve an electromagnetic interference incident?

22. At what level does the Air Force want electromagnetic interference problems resolved?

23. Which feature of the Fluke 8025A locks the measurement into the display for viewing andautomatically updates the display when you take a new measurement?

24. When you use the Fluke 8025A, which voltage range do you select to measure 50 volts DC?

25. When testing a diode with the 8025A, the leads across a "good" diode produces an "OL"(open) on the display in one direction while reversing the leads produces

26. Which of these bit rates do you use for a bit error rate test on a 64 kbps data circuit?

27. What are the two basic functions of shielding?

28. What power line fault category is more typically referred to as Electro-MagneticInterference and Radio Frequency Interference?

29. Which statement concerning bandwidth is true?

30. In frequency modulation, a significant sideband contains at least what percentage of the totaltransmitted power?

31. A 5 kHz modulating signal has enough peak voltage to cause a deviation of 15 kHz. What isthe modulation index?

32. If an error should occur, what transmission is lost in an synchronous transmission?

33. When using vertical redundancy check, what significance does the amount of ones have in adata bit pattern?

34. When using forward error control as a method of error correction, where does errorcorrection take place?

35. Which fiber-optic connector uses quick-release, keyed bayonet couplings that are preferredin situations where severe vibrations are not expected?

36. A system-generated electromagnetic pulse is a problem for satellites and reentry vehiclesthat are

37. What man-made noise results from voltage surges, arcing, or corona discharges?

38. Who is tasked to provide interference resolution support to the unified commanders?

39. Resistance reading on the ground under test is plotted on a graph of

40. What operational capability of the communication service monitor produce sine, square andtriangle waveforms?

41. (001) What is one reason for modulation that involves modulating low frequency signals for transmission over long distances?

42. (002) If a carrier frequency of 1 MHz and a modulating tone of 10 kHz goes to the modulator, the output signal include

43. (002) The bandwidth of an amplitude modulated signal is

44. What part of the pulse code modulation process converts a continuous time signal into adiscrete time signal?

45. What type of light is emitted from a laser?

46. What do you do when you are reasonably sure electromagnetic interference exists?

47. Which probe does not need to actually make contact with the circuit under test?

48. The two switches on the front panel of the wattmeter correspond to the

49. Why should the number of splices be controlled during fiber optic installation?

50. How many phases of generator power are usually required for industrial and commercialapplications?

51. How are voltage, time, and depth represented on the oscilloscope display?

52. What type of sampling does a digital storage oscilloscope normally use on single-shot orseldom-occurring signals?

53. What function is not part of the communication service monitor?

54. What operational capability of the communication service monitor receives amplitude andfrequency modulated signals?

55. Which one do you like?

56. A short section of single fiber cable that has a connector at each end is called a

57. Which type of filters are always used in combination with surge arresters?

58. Which type of intermodulation interference varies significantly with temperature andweather conditions?

59. What are the two main types of photodetectors?

60. What component of a protocol analyzer discards frames based on its definition or activates atrigger based on the trigger definition?

61. During what operation is the radio frequency blanking output used on the HP 436A powermeter?

62. What feature is useful for making adjustments to optimize any of the parameters which thewattmeter measures?

63. (002) Use the formula on page 1–3. If an oscilloscope displays a modulation envelope having an Emax of 200 volts and an Emin of 20 volts, what is the modulation percentage?

64. In phase modulation, the carrier's

65. What is the first step in the pulse code modulation process?

66. Currents and voltages induced on power lines, cable links, and pipelines by electromagneticpulse are called

67. What type of electromagnetic interference occurs when a receiver responds to off-frequencysignals?

68. How can you normally eliminate electromagnetic interference noise bursts caused bysodium and mercury vapor lights that have stopped working while the power is still applied?

69. Sampled data points are stored in the memory of a digital storage oscilloscope as

70. Which is the primary means of measuring the quality of transmitted digital information, andhow is this means derived?

71. What protocol analyzer test window provides information concerning the networkutilization and frame error that are related to a specific protocol?

72. What protocol analyzer test window provides information concerning the bandwidthutilization and the number of connections that are related to specific nodes?

73. What kind of bonds are normally applied to signal reference bonds?

74. What error detection method is used for checking a data block greater than 512 and is about99 percent effective in most applications?

75. High-altitude electromagnetic pulse is a wideband phenomenon that involves whichfrequency range?

76. High-altitude electromagnetic pulse environment protection is important for critical, timeurgent mission systems because it

77. Which oscilloscope probe is essentially just a shielded piece of wire?

28. What power line fault category is more typically referred to as Electro-Magnetic
Interference and Radio Frequency Interference?