3D1X3 Self Test Questions Vol. 1 Unit 2

Front 1

What activity must occur to produce an EMP?

Back 1

Nuclear explosion.

Front 2

Which two elements produce the EMP effects?

Back 2

(1) Gamma rays.
(2) Secondary neutron radiation.

Front 3

What are the electromagnetic pulse forms produced by the derived environment?

Back 3

(1) HEMP.
(2) SGEMP.
(3) SREMP.

Front 4

Why is high-altitude EMP environment protection important for critical, time urgent mission
systems?

Back 4

It can affect many systems simultaneously.

Front 5

Why is system-generated EMP a problem for satellites and reentry vehicles?

Back 5

They are directly exposed to the nuclear radiation from a high-altitude burst.

Front 6

What are the two distinct regions of importance for SREMP?

Back 6

(1) Source.
(2) Radiated.

Front 7

What effects on communications are there after a nuclear detonation?

Back 7

Scintillation and blackout.

Front 8

What capabilities can be employed by Milstar to mitigate communications loss within a
contaminated area?

Back 8

Crosslink.

Front 9

Describe the difference between long-line and local effect of EMP on facilities?

Back 9

Long-line effects are the currents and voltages induced on long power lines, communication cable links, or
even other conductors, such as pipelines. Some of these EMP effects may be induced far away and guided
to the facility along the conductor. Local effects are the currents and voltages induced directly on the
facility shield, building structure, wiring, equipment cabinets, and so forth.

Front 10

How can a facility be survivable against EMP?

Back 10

To create an EMP survivability facility, it should be shielded as much as possible. Furthermore, all
openings to the facility need to be filtered and protected. The facility also needs to be isolated from any
external electric EM propagation in the earth.

Front 11

What happens in an EMP induced event?

Back 11

Can cause a magnetic or electric field to be induced in an electrical circuit that can cause an error in the
response of the circuit.

Front 12

Why is bonding important in EMP protection?

Back 12

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

Front 13

Where should all metallic penetrations entering the protected area be located?

Back 13

At a common location.

Front 14

To reduce coupling into susceptible circuits, what element is installed on both signal and power
lines?

Back 14

Filters.

Front 15

What is EMI?

Back 15

It is any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective
performance of electronics/electrical equipment.

Front 16

How do you differentiate an unintentional interference from jamming signal?

Back 16

Unintentional interference normally travels only a short distance; a search of the immediate area may reveal
the source of this type of interference. Moving the receiving antenna for short distances may cause
noticeable variations in the strength of the interfering signal. These variations normally indicate
unintentional interference. Conversely little or no variation normally indicates enemy jamming.

Front 17

What type of EMI occurs when an unwanted carrier frequency follows the normal signal path
through the effected receiver?

Back 17

Co-channel.

Front 18

How can you eliminate broadband transmitter noise?

Back 18

By using a band pass filter.

Front 19

What type of equipment often generates many spurious emissions?

Back 19

Receiver responding to off frequency signals.

Front 20

What type of equipment often generates many spurious emissions?

Back 20

Rapid tuning transmitter.

Front 21

What intermodulation frequency components can cause EMI in the receiver/transmitter?

Back 21

Sum and difference.

Front 22

What type of intermodulation can have a very large bandwidth and cause more severe
interference problems than intermodulation products created in either transmitters or receivers?

Back 22

Rusty bolt.

Front 23

What type of EMI occurs when high level radiated signals penetrate and induce a radio frequency
voltage in the internal circuits of a system or equipment?

Back 23

Brute force.

Front 24

What AM receivers are particularly susceptible to power line noise?

Back 24

HF and VHF.

Front 25

Relays may cause interference inside receivers because of broadband radiated noise originating
from what?

Back 25

The opening and closing of the contacts.

Front 26

How would you normally eliminate electromagnetic interference caused by sodium and mercury
vapor lights?

Back 26

Installing a new bulb.

Front 27

What is the purpose of the AFSIR program?

Back 27

Document and resolve spectrum interference problems.

Front 28

Under the AFSIR program, what organizational level must begin an investigation to identify the
source of EMI?

Back 28

Lowest unit level.

Front 29

Why must you ensure maintenance personnel responsible for the affected equipment check it
before submitting an EMI report?

Back 29

To ensure the equipment is not causing the problem.

Front 30

How do you confirm an EMI problem?

Back 30

Check with other users of the same frequency and determine whether they receive the EMI.

Front 31

If your EMI sounds like noise, what are the possible sources of these interferences?

Back 31

The source may be power lines, welding equipment, and so forth.

Front 32

Who is responsible for recording specific information concerning EMI?

Back 32

The operator.

Front 33

What types of EMIs are exempt from AFSIR reporting?

Back 33

USAF units under the operational control of a combatant command, transient EMI from natural sources,
suspected or confirmed cause of interference from space weather, interference is only experienced aboard
ISR aircraft aloft and is localized when mission equipment or payload equipment is turned on/off or used,
and If EMI is only affecting frequencies assigned on a noninterference basis for training purposes.

Front 34

How should an AFSIR report be submitted?

Back 34

All reports are submitted through their chain of command, through MAJCOM, and to the AFFMA.

Front 35

What document contains guidelines for classifying EMI reports?

Back 35

CJCSI 3320.02B, JSIR.

Front 36

What service provided by the 85 EIS analyzes and recommends corrective actions for reported
EMI problems?

Back 36

QFIRC.

Front 37

What is the objective of the JSIR program?

Back 37

Report and assist with the resolution of EW and recurring EMI.

Front 38

Who maintains a central database of EMI cases, resolutions, and lessons-learned for all DOD
EMI?

Back 38

JSC.