Vol1 URE2 CDC 3D153

1. What initial nuclear radiation elements generate electromagnetic pulses?

Gamma rays and neutrons.

Thermally generated x-rays.

Transient radiation effects on electronics.

Neutrons and thermally generated X-rays

2. If the interference can be eliminated by disconnecting the receiving antenna, the source of the disturbance is most likely?

Line noise.

Internal to the radio

External to the radio

Radio receiver trouble

3. Which one of the following statements are true concerning shielding?

Cables should be of unshielded construction

Only ventilation ports are shielded along the walls.

Sensitive equipment will be located within the shielded barrier.

All power lines supplying shielded areas does not require filters.

4. What is the purpose of bonding?

To isolate facility from any external electrical electromagnetic propagation

To reduce interference coupling around circuits and around interconnecting lines.

To ensure a mechanically strong, low impedance interconnection between metal objects.

To eliminate harmful differences of potential between the various telephone cables enteringfacility.

5. 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?

Change the bulb

Grround out the light fixture

Install a noise reject filter on the light

Install a noise reject filter on the receiver

6. At what level does the Air Force want electromagnetic interference (EMI) problems resolved?

Affected unit

Affected major command

Electromagnetic environmental effects office

Spectrum interference resolution office

7. What is the first step in the Air Force spectrum interference resolution (SIR) program?

Indentify the source

Verifying the source

Resolving the interference

Reporting the interference

8. Who is initially responsible for reporting an electromagnetic interference (EMI)?

The operator

Major Command (MAJCOM)

The frequency manager (FM)

Federal Communications Commission

9. What is an example of intentionally induced electromagnetic interference (EMI)?

Jamming

Spurious responses

Intermodulation

Power line noise

10. What do you do when you are resonably sure electromagnetic interference (EMI) exists?

Request engineering assistance

Contact the base frequency manager

Systematically gather data for analysis

Contact the spectrum interference resolution (SIR) office

11. Which types of filters are always used in combination with surge arresters?

Linear

Alternating Current (AC) line

Direct Current (DC) line

Power line

12. What type of equipment often generates many spurious emissions?

Slow tuning receiver

Rapid tuning receiver

Slow tuning transmitter

Rapid tuning transmitter

13. What Air Force program is used to resolve an electromagnetic interference (EMI) incident?

Mishap prevention

Frequency management (FM)

Electrostatic discharge (ESD) control

Spectrum interference resolution (SIR)

14. What type of electromagnetic interference (EMI) occurs when a receiver responds to off-frequency signals?

Rusty bolt

Co-channel

Brute force

Spurious responses

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

Relays

Lightning

Power line

Switching equipment

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

The operator

Joint Spectrum Center (JSC)

Installation Spectrum Manager (ISM)

Federal Communications Commissions (FCC)

17. High-altitude electromagnetic pulse is what type of frequency phenomenon, and inolves which frequency range?

Secondary; 1Hz to 1GHz

Wideband; 1Hz to 1GHz

Secondary; 10Hz to 10GHz

Wideband; 10Hz to 10GHz

18. A system-generated electromagnetic pulse is a problem for satellites and reentry vehicles that 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.

19. Atmospheric disturbances from initial nuclear radiation on higher frequencies affect communications by which types of effects?

Blackout

Absorption

Scintillation

Attenuation

20. Which Air Force service provides on-site direction finding and interference problem analysis?

USAF Gold Flag Program

Unit Self-Sufficiency Support

Reliability and Maintainability Deficiency

Quick Fix Interference Reduction Capability

21. What program addresses persistent and recurring interferences problems in joint operations?

The reliability and maintainability

Joint Spectrum Interference Resolution (SIR)

Air Force Spectrum Interference Resolution (AFSIR)

The Quick Fix Interference Reduction Capability (QFIRC)

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

Secondary

Radiated

Plasma

Source

23. How does scintiallation effect communication?

Large attenuation of the transmitted signal causing the received signal-to-noise ratio (SNR) to fall below unity.

Transmitted signal fading caused by multiple path propagation through the structured plasma field.

Layers of charged electrons that are trapped and prevent transmissions through the layer.

Absorption of the transmitted signal through the contaminated area.

24. What electromagnetic pulse region is the principal threat to electronic systems by cable?

Local