3D152 Volume 1 Ures
Settings
3D152 Volume 1 UREs
- 1.What is an example of analog-to-digital and digital-to-analog techniques?
- A.
Amplitude modulation (AM) and frequency modulation (FM).
- B.
Pulse code modulation (PCM) and frequency shift keying (FSK).
- C.
Phase modulation (PM) and quadrature phase shift keying (QPSK).
- D.
Pulse code modulation (PCM) and continuously variable slope delta (CVSD) modulation.
- 2.What converts analog signal information into an analog carrier signal?
- A.
Delta modulation (DM).
- B.
Digital modulation.
- C.
Analog modulation.
- D.
Adaptive modulation.
- 3.What converts analog signal information into a digital carrier signal?
- A.
Delta modulation (DM).
- B.
Analog modulation.
- C.
Digital modulation.
- D.
Adaptive modulation.
- 4.The information-carrying components that occur on either side of a carrier are called
- A.
Sidebands.
- B.
Sine waves.
- C.
Frequency translators.
- D.
Modulating frequencies.
- 5.Amplitude modulation (AM) requires a bandwidth that is
- A.
Twice that of the modulating signal.
- B.
Half that of the modulating signal.
- C.
Twice that of the carrier signal.
- D.
Half that of the carrier signal.
- 6.The upper sideband in a single-sideband suppressed carrier (SSBSC) modulation is eliminated by
- A.
Filtering.
- B.
Detection.
- C.
Compression.
- D.
Companding.
- 7.We can express the 6-to–1 improvement of the single-sideband suppressed carrier (SSBSC) modulation over conventional amplitude modulation (AM) as
- A.
2 decibels (dB) of improvement.
- B.
4 dB of improvement.
- C.
6 dB of improvement.
- D.
8 dB of improvement.
- 8.The only basic waveform in nature is a
- A.
Carrier wave.
- B.
Pure sine wave.
- C.
Resultant wave.
- D.
Composite wave.
- 9.A modulated waveform that contains a carrier plus two sidebands for each modulation frequency is a description of
- A.
A phase modulation (PM).
- B.
A pulse modulation.
- C.
A frequency modulation (FM).
- D.
An amplitude modulation (AM).
- 10.The amount of deviation in a frequency modulation (FM) signal is directly proportional to the modulating signal’s
- A.
Phase.
- B.
Amplitude.
- C.
Frequency.
- D.
Amplitude and frequency.
- 11.If 100 percent modulation is exceeded and there is distortion in the modulating signal, additional sidebands are generated. We identify these sidebands as what?
- A.
Transmitted intelligence.
- B.
Intensity of speech.
- C.
Composite waves.
- D.
Splatter.
- 12.What is the main advantage of differential phase shift keying (DPSK)?
- A.
Carrier presence is required to detect changes.
- B.
It requires a less complex receiver than a basic phase shift keying (PSK) signal.
- C.
It requires a more complex receiver than a basic PSK signal.
- D.
The demodulator needs to detect changes in absolute phase values.
- 13.Which of the following is not considered an analog modulation techniques?
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Pulse-position modulation (PPM).
- D.
Pulse-code modulation (PCM).
- 14.The amount of phase shift in a phase modulation (PM) signal is directly proportional to the
- A.
Modulation index.
- B.
Rate of phase shift.
- C.
Frequency of the modulating signal.
- D.
Amplitude of the modulating signal.
- 15.What form of modulation is insensitive to signal variations?
- A.
Delta.
- B.
Frequency shift keying (FSK).
- C.
Pulse-amplitude modulation (PAM).
- D.
Binary-phase shift keying or bi-phase shift keying (BPSK).
- 16.In quadrature-phase shift keying (QPSK) the radio frequency (RF) bandwidth for a quadriphase signal is what of that required by a bi-phase signal, given the same data rate.
- A.
Four times.
- B.
Double.
- C.
Half.
- D.
The same.
- 17.The form of pulse modulation in which the pulse is varied within a set range of positions is known as
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Pulse-position modulation (PPM).
- D.
Pulse-code modulation (PCM).
- 18.Quantized analog modulation is actually
- A.
Pulse-amplitude modulation (PAM).
- B.
Pulse-duration modulation (PDM).
- C.
Less tolerant of noise than frequency modulation (FM).
- D.
Analog-to-digital conversion.
- 19.How many bits per character of a 16-step pulse-code modulation (PCM) system are used to describe the quantized analog sample?
- A.
3.
- B.
4.
- C.
5.
- D.
8.
- 20.The process of coding pulse code modulation (PCM) quantized pulses to make them a constant duration and amplitude is
- A.
Encoding.
- B.
Companding.
- C.
Uniform quantizing.
- D.
Nonuniform quantizing.
- 21.In Time Division Multiplexing (TDM), the transmitting multiplexer will put a bit or a byte from each of the incoming lines into a specifically allocated what?
- A.
Channel.
- B.
Trunk.
- C.
Time slot.
- D.
Port.
- 22.The two major types of frame structures are
- A.
Low speed and high speed.
- B.
High speed and EBCDIC.
- C.
CCITT and low speed.
- D.
EBCDIC and CCITT.
- 23.The method of multiplexing the T1 multiplexer uses is
- A.
Frequency division.
- B.
Binary division.
- C.
Pulse division.
- D.
Time division.
- 24.Wave-division multiplexing (WDM) creates the virtual channels for multiplexing them together for transmission by using different
- A.
Wavelengths or lambdas.
- B.
Wavelengths or gammas.
- C.
Frequencies or lambdas.
- D.
Frequencies or gammas.
- 25.The most common wave-division multiplexing (WDM) system uses how many wavelengths?
- A.
One wavelength.
- B.
Two wavelengths.
- C.
Three wavelengths.
- D.
Four wavelengths.
- 26.Individual pulses within a digital signal are
- A.
Bits.
- B.
Bytes.
- C.
Codes.
- D.
Blocks.
- 27.What unit is most commonly used in data systems to express signaling speed?
- A.
Baud.
- B.
Baudot.
- C.
Sense interface.
- D.
Bits per second.
- 28.Bit count integrity problems are primarily caused by
- A.
Impedance mismatch.
- B.
System timing faults.
- C.
Improper equipment settings.
- D.
Changes in atmospheric conditions.
- 29.Three categories of synchronization used in digital data circuits are
- A.
Synchronous, asynchronous, and isochronous.
- B.
Isochronous, asynchronous, and bisynchronous.
- C.
Nonsynchronous, bisynchronous, and synchronous.
- D.
Asynchronous, bisynchronous, and nonsynchronous.
- 30.Which option is a characteristic of synchronous data operation?
- A.
Timing pulses are transmitted within the signal stream.
- B.
Start and stop pulses control data transmission.
- C.
System timing is not of critical importance.
- D.
All data bits are the same length in time.
- 31.A digital signal that contains synchronizing bits within the signal stream describes
- A.
Synchronous operation.
- B.
Asynchronous operation.
- C.
Synchronous and/or isochronous operation.
- D.
Asynchronous and/or synchronous operation.
- 32.In what type of signal is the information contained in the transition, and there is a transition from one state to the other only when a mark bit is sent?
- A.
Non-return-to-zero (NRZ) level.
- B.
Non-return-to-zero mark.
- C.
Non-return-to-zero space.
- D.
Return-to-zero level.
- 33.In what type of signal does the signal level move to one of the discrete signal levels, but returns to the zero level after a predetermined time?
- A.
Non-return-to-zero (NRZ) level.
- B.
Non-return-to-zero mark.
- C.
Non-return-to-zero space.
- D.
Return-to-zero.
- 34.Which statement best describes an alternate mark inversion (AMI) signal?
- A.
The information is transmitted in three different voltage levels.
- B.
A logic one is transmitted as positive voltage if the previous logic one was negative.
- C.
The level always returns to zero for 50 percent of the bit cycle after every transition.
- D.
Bipolar violations are intentionally inserted into a data signal to break up long strings of zeros.
- 35.Digital coding techniques such as binary with eight-zero substitution (B8ZS) are becoming more popular because they are designed to
- A.
Provide error-free signaling.
- B.
Operate at higher data rates.
- C.
Eliminate bipolar violations.
- D.
Maintain ones density standards.
- 36.Which statement best describes a binary with eight-zero substitution (B8ZS) signal?
- A.
The information is transmitted in three different voltage levels.
- B.
A logic one is transmitted as positive voltage if the previous logic one was negative.
- C.
The level always returns to zero for 50 percent of the bit cycle after every transition.
- D.
Bipolar violations are intentionally inserted into a data signal to break up long strings of zeros.
- 37.The major difference between conditioned di-phase (CDI) and other schemes is the
- A.
Lack of mid-bit transitions.
- B.
Use of mid-bit transitions for timing.
- C.
Data being encoded in the mid-bit transitions.
- D.
Voltage levels used for signaling the mid-bit transitions.
- 38.How many bits are in the D4 framing sequence?
- A.
8.
- B.
12.
- C.
24.
- D.
48.
- 39.How many bits are in the extended superframe format (ESF) framing sequence?
- A.
8.
- B.
12.
- C.
24.
- D.
48.
- 40.What communications control signal uses a two-frequency dialing combination?
- A.
Pulse dialing.
- B.
Tone dialing.
- C.
Digit dialing.
- D.
Address dialing.
- 41.What communications information signal uses a continuous 350- and 440-Hz frequency pair?
- A.
Dial tone.
- B.
Ringback signal.
- C.
Off-hook alert.
- D.
Call waiting.
- 42.What communications information signal uses a signal cycled on and off for 0.5 second and contains the generation of a 480- and 620-Hz frequency pair?
- A.
Dial tone.
- B.
Busy signal.
- C.
Off-hook alert.
- D.
Call waiting.
- 43.What communications supervisory signal uses a continuous application of direct current voltage for signaling?
- A.
Record warning.
- B.
Fast busy signal.
- C.
Loop-start.
- D.
E and M.
- 44.When is the voltage applied in loop-start signaling?
- A.
When dial tone is present.
- B.
On-hook condition.
- C.
Off-hook condition.
- D.
During the ringback signal.
- 45.In common associated signaling (CAS), what is the seventh bit in frames 6 and 12 used to convey signaling information known as?
- A.
Bit robbing.
- B.
Bit stuffing.
- C.
Frame correction.
- D.
Frame enhancement.
- 46.In what common channel signaling (CCS) mode are the messages relating to signaling between two points conveyed directly interconnecting these signaling points?
- A.
Associated mode.
- B.
Nonassociated mode.
- C.
Quasi-associated mode.
- D.
Multi-associated mode.
- 47.What are the two principle weighting characteristics in use with telecommunication circuit noise?
- A.
Institute of Electronic and Electrical Engineers and CCITT psophometric.
- B.
Noise analysis and CCITT psophometric.
- C.
CCITT psophometric and C-message.
- D.
C-message and noise analysis.
- 48.While timing makes sure the equipment is sending and receiving bits at the same time intervals, synchronization makes sure that the
- A.
Receive equipment timing is set properly.
- B.
Transmit equipment timing is set properly.
- C.
Receive equipment can find its place in the bit stream.
- D.
Transmit equipment can find its place in the bit stream.
- 49.What term is associated with the delay or lag introduced in the application of voltage from one section to the next?
- A.
Latency.
- B.
Phase delay.
- C.
Propagation constant.
- D.
Phase delay distortion.
- 50.Attenuation distortion is caused by
- A.
A line loss for the various frequency components comprising a voice transmission.
- B.
The line loss, the distance of transmission lines, and faults in the transmission cables.
- C.
Faults in the transmission cables and the number of splices in the line varying with the frequency.
- D.
Differing attenuation rates for the various frequency components comprising a voice frequency transmission.
- 51.Jamming a portion of the frequency spectrum is an example of
- A.
Electronic combat.
- B.
Electronic protection.
- C.
Electronic attack.
- D.
Electronic warfare support.
- 52.The definition of electronic attack can be found in which publication?
- A.
Air Force Doctrine Document 2–5.1.
- B.
Air Force Instruction 10–101.
- C.
Air Force Policy Memorandum 2–1.
- D.
Air Force Manual 2–5.1.
- 53.Any actions we take to protect our forces, facilities, and equipment for electronic action that can destroy or degrade our capabilities is considered
- A.
Electronic combat.
- B.
Electronic protection.
- C.
Electronic attack.
- D.
Electronic warfare support.
- 54.Varying the pulse repetition frequency on a radar set is an example of
- A.
Electronic combat.
- B.
Electronic attack.
- C.
Electronic protection.
- D.
Electronic warfare support.
- 55.Electronic warfare support includes devices such as
- A.
Anti-radiation missiles and directed energy weapons.
- B.
Intelligence platforms and noise jamming systems.
- C.
Radar warning receivers and intelligence systems.
- D.
Directed energy weapons and radar warning receivers.
- 56.When a multimeter has three input terminal jacks, which jack is always used?
- A.
Voltage terminal.
- B.
Common terminal.
- C.
Voltage and current terminal.
- D.
Common and current terminal.
- 57.When using a multimeter, which mode should be used if the reading is unreadable due to fluctuations?
- A.
Range.
- B.
Frequency.
- C.
Display hold.
- D.
Minimum/maximum (MIN/MAX).
- 58.When using a multimeter, which mode should be used if the reading fluctuates and a more accurate reading is desired?
- A.
Minimum/maximum (MIN/MAX).
- B.
Display hold.
- C.
Frequency.
- D.
Range.
- 59.When using an ohmmeter to take a resistance reading, what preliminary precaution should you take?
- A.
Properly seat the test lead into the current input terminal jack.
- B.
Disconnect the power from the circuit being tested.
- C.
Place the meter in the frequency mode.
- D.
Set the range for maximum reading.
- 60.What principle of operation does the time domain reflectometer use to test cables?
- A.
Amplitude.
- B.
Frequency.
- C.
Audio.
- D.
Radar.
- 61.Which push-buttons would you select to get 125-ohm (Ω) impedance on the time domain reflectometer?
- A.
50Ω, 75Ω, and 125Ω.
- B.
75Ω and 125Ω.
- C.
50Ω and 125Ω.
- D.
50Ω and 75Ω.
- 62.What is the power that is reflected back to an optical source in the time domain reflectometer (TDR)?
- A.
Reflection.
- B.
Backscatter.
- C.
Scatter coefficient.
- D.
Reflection coefficient.
- 63.What are the two major sections of a bit error rate test (BERT) set?
- A.
Emitter and detector.
- B.
Emitter and receiver.
- C.
Transmitter and detector generator.
- D.
Transmitter and receiver.
- 64.Which section of a bit error rate test (BERT) set measures the received test pattern?
- A.
Transmitter.
- B.
Emitter.
- C.
Detector.
- D.
Receiver.
- 65.What type of framing format should you use to conduct a bit error rate test (BERT) on a T1 circuit configured for binary with eight-zero substitution (B8ZS) coding?
- A.
Extended superframe.
- B.
Alternate mark inversion.
- C.
Return-to-zero.
- D.
Superframe.
- 66.When performing a bit error rate test (BERT), what determines the size of a test pattern segment?
- A.
The total number of bits in the test pattern.
- B.
The total number of bytes that represent the bits test pattern.
- C.
The number of bits that can represent the total number of bits in the test pattern.
- D.
The number of bits in the number of bytes that are equally divided into the test pattern.
- 67.What type of error is the result of two successive logic one pulses of the same polarity in violation of alternate mark inversion coding rules?
- A.
Cyclic redundancy check.
- B.
Bipolar violation.
- C.
Bit slip.
- D.
Frame.
- 68.On a breakout box, how many RS–232 key interface signals can be monitored and accessed individually?
- A.
12.
- B.
20.
- C.
24.
- D.
25.
- 69.The purpose of the miniature ON/OFF switches on a breakout box is to
- A.
Measure the individual interface signals.
- B.
Change the voltage of individual interface signals.
- C.
Allow the interruption of the individual interface conductors.
- D.
Allow the cross-patching of the individual interface conductors.
Back to top