Vol1 Ure2 CDC 3D153
This is a quiz for AFSC 3D153 CDC and to be used as a study aid. Unit Review section 2 Volume 1
- 1.
What initial nuclear radiation elements generate electromagnetic pulses?
- A.
Gamma rays and neutrons.
- B.
Thermally generated x-rays.
- C.
Transient radiation effects on electronics.
- D.
Neutrons and thermally generated X-rays
Correct Answer
A. Gamma rays and neutrons. -
- 2.
High-altitude electromagnetic pulse is what type of frequency phenomenon, and inolves which frequency range?
- A.
Secondary; 1Hz to 1GHz
- B.
Wideband; 1Hz to 1GHz
- C.
Secondary; 10Hz to 10GHz
- D.
Wideband; 10Hz to 10GHz
Correct Answer
B. Wideband; 1Hz to 1GHz -
- 3.
A system-generated electromagnetic pulse is a problem for satellites and reentry vehicles that are?
- A.
Susceptible to the wideband frequency phenomenon.
- B.
Directly exposed to nuclear radiations from a high-altitude burst
- C.
Affected by the azimuthal magnetic fields and time-varying air conductivity
- D.
Influenced by the signal fading or waveform distortion caused by the structured plasma field.
Correct Answer
B. Directly exposed to nuclear radiations from a high-altitude burst -
- 4.
Which distinct region of the source region electromagnetic pulse is produced by the interactions between the weapon products and the earth’s atmosphere?
- A.
Secondary
- B.
Radiated
- C.
Plasma
- D.
Source
Correct Answer
D. Source -
- 5.
What electromagnetic pulse region is the principal threat to electronic systems by cable?
- A.
Local
- B.
Source
- C.
Radiated
- D.
Long-line
Correct Answer
C. Radiated -
- 6.
How does scintiallation effect communication?
- A.
Large attenuation of the transmitted signal causing the received signal-to-noise ratio (SNR) to fall below unity.
- B.
Transmitted signal fading caused by multiple path propagation through the structured plasma field.
- C.
Layers of charged electrons that are trapped and prevent transmissions through the layer.
- D.
Absorption of the transmitted signal through the contaminated area.
Correct Answer
B. Transmitted signal fading caused by multiple path propagation through the structured plasma field. -
- 7.
Atmospheric disturbances from initial nuclear radiation on higher frequencies affect communications by which types of effects?
- A.
Blackout
- B.
Absorption
- C.
Scintillation
- D.
Attenuation
Correct Answer
C. Scintillation -
- 8.
Which one of the following statements are true concerning shielding?
- A.
Cables should be of unshielded construction
- B.
Only ventilation ports are shielded along the walls.
- C.
Sensitive equipment will be located within the shielded barrier.
- D.
All power lines supplying shielded areas does not require filters.
Correct Answer
C. Sensitive equipment will be located within the shielded barrier. -
- 9.
What is the purpose of bonding?
- A.
To isolate facility from any external electrical electromagnetic propagation
- B.
To reduce interference coupling around circuits and around interconnecting lines.
- C.
To ensure a mechanically strong, low impedance interconnection between metal objects.
- D.
To eliminate harmful differences of potential between the various telephone cables entering facility.
Correct Answer
C. To ensure a mechanically strong, low impedance interconnection between metal objects. -
- 10.
Which types of filters are always used in combination with surge arresters?
- A.
Linear
- B.
Alternating Current (AC) line
- C.
Direct Current (DC) line
- D.
Power line
Correct Answer
A. Linear -
- 11.
If the interference can be eliminated by disconnecting the receiving antenna, the source of the disturbance is most likely?
- A.
Line noise.
- B.
Internal to the radio
- C.
External to the radio
- D.
Radio receiver trouble
Correct Answer
C. External to the radio -
- 12.
What is an example of intentionally induced electromagnetic interference (EMI)?
- A.
Jamming
- B.
Spurious responses
- C.
Intermodulation
- D.
Power line noise
Correct Answer
A. Jamming -
- 13.
What type of electromagnetic interference (EMI) occurs when a receiver responds to off-frequency signals?
- A.
Rusty bolt
- B.
Co-channel
- C.
Brute force
- D.
Spurious responses
Correct Answer
D. Spurious responses -
- 14.
What type of equipment often generates many spurious emissions?
- A.
Slow tuning receiver
- B.
Rapid tuning receiver
- C.
Slow tuning transmitter
- D.
Rapid tuning transmitter
Correct Answer
D. Rapid tuning transmitter -
- 15.
What man-made noise results from voltage surges, arcing, or corona discharges?
- A.
Relays
- B.
Lightning
- C.
Power line
- D.
Switching equipment
Correct Answer
C. Power line -
- 16.
How can you normally eliminate electromagnetic interference (EMI) noise bursts caused by sodium and mercury vapor lights that have stopped working while the power is still applied?
- A.
Change the bulb
- B.
Grround out the light fixture
- C.
Install a noise reject filter on the light
- D.
Install a noise reject filter on the receiver
Correct Answer
A. Change the bulb -
- 17.
What Air Force program is used to resolve an electromagnetic interference (EMI) incident?
- A.
Mishap prevention
- B.
Frequency management (FM)
- C.
Electrostatic discharge (ESD) control
- D.
Spectrum interference resolution (SIR)
Correct Answer
D. Spectrum interference resolution (SIR) -
- 18.
At what level does the Air Force want electromagnetic interference (EMI) problems resolved?
- A.
Affected unit
- B.
Affected major command
- C.
Electromagnetic environmental effects office
- D.
Spectrum interference resolution office
Correct Answer
A. Affected unit -
- 19.
What is the first step in the Air Force spectrum interference resolution (SIR) program?
- A.
Indentify the source
- B.
Verifying the source
- C.
Resolving the interference
- D.
Reporting the interference
Correct Answer
A. Indentify the source -
- 20.
What do you do when you are resonably sure electromagnetic interference (EMI) exists?
- A.
Request engineering assistance
- B.
Contact the base frequency manager
- C.
Systematically gather data for analysis
- D.
Contact the spectrum interference resolution (SIR) office
Correct Answer
C. Systematically gather data for analysis -
- 21.
Who is initially responsible for reporting an electromagnetic interference (EMI)?
- A.
The operator
- B.
Major Command (MAJCOM)
- C.
The frequency manager (FM)
- D.
Federal Communications Commission
Correct Answer
A. The operator -
- 22.
Which Air Force service provides on-site direction finding and interference problem analysis?
- A.
USAF Gold Flag Program
- B.
Unit Self-Sufficiency Support
- C.
Reliability and Maintainability Deficiency
- D.
Quick Fix Interference Reduction Capability
Correct Answer
D. Quick Fix Interference Reduction Capability -
- 23.
What program addresses persistent and recurring interferences problems in joint operations?
- A.
The reliability and maintainability
- B.
Joint Spectrum Interference Resolution (SIR)
- C.
Air Force Spectrum Interference Resolution (AFSIR)
- D.
The Quick Fix Interference Reduction Capability (QFIRC)
Correct Answer
B. Joint Spectrum Interference Resolution (SIR) -
- 24.
Who is tasked to provide interference resolution support to the unified commanders?
- A.
The operator
- B.
Joint Spectrum Center (JSC)
- C.
Installation Spectrum Manager (ISM)
- D.
Federal Communications Commissions (FCC)
Correct Answer
B. Joint Spectrum Center (JSC) -
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Current Version
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Mar 21, 2022Quiz Edited by
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Jun 25, 2012Quiz Created by
Jayhuiz23
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