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RCDD > Ch 02 - Electromagnetic Compatibility > Flashcards

Ch 02 - Electromagnetic Compatibility Flashcards

1
Q

2–1 electromagnetic compatibility (EMC)

EMI =

A

Frequency overlap

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2
Q

2–2 EMC

Electromagnetic spectrum =

(7)

A

Light

radiowaves

microwaves

infrared (IR)

radiation

ultraviolet rays

x-rays

gamma rays

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3
Q

2–2 EMC

Electromagnetic spectrum visible lights =

A

10^15 (1PHz)

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4
Q

2-2 electromagnetic spectrum

PHz =

A

Petahertz

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5
Q

2–3 EMC

Conducted coupling =

A

Except solid-state devices, does not belong

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6
Q

2–4 EMC

ITS designer =

A

Not directly responsible of EMC of ITS

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7
Q

2–6 EMC electromagnetic

Internal EMI sources =

A

Except incandescent light fixtures, does not belong

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8
Q

2–8 EMC

EMC measurement =

A

No techniques to measure

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9
Q

2–16 EMC – the solution

EMI types =

(2 and their examples)

A

* man-made: Conversion, distribution, generators

* natural: Atmospheric electricity, Cosmic radiation/geomagnetism disturbances

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10
Q

2–19 EMC electromagnetic qualification parameters

ESD =

A

Electrostatic discharge

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11
Q

2–19 EMC electromedical qualification parameter

type of ESD =

A

Discharge through a spark in the air

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12
Q

2–20 EQP

Immunity Air L2 =

A

4kV

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13
Q

2–20 EQP

Immunity contact L4 =

A

8kV

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14
Q

2–20 electromagnetic qualification parameters

Immunity contact L2 =

A

4kV

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15
Q

2–27 EMC

CRT =

(2)

A

* cathode ray tube

* susceptible to RFI

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16
Q

2–28 EMC unwanted signals

Types of unwanted signals in EMI =

(2)

A

* common-mode (CM)

* differential mode (DM)

17
Q

2–28 EMC unwanted signal

CM =

(2)

A

* Predominant unwanted signal

* locks up computer

18
Q

2-28 unwanted signals

ferrite beads =

A

filter unwanted signal

19
Q

2–29 EMC unwanted signals

DM noise =

A

Corrupting transmitted signals on a balance circuit

20
Q

2–44 cabling systems

Branch circuits of 5kVA =

A

No additional separation necessary

21
Q

2–44 cabling system

Minimum separation electrical motors and transformers =

22
Q

2–44 cable separation

Minimum separation for unshielded power, nonmetal pathways =

23
Q

2–44 cabling separation

Min. separation unshielded power, grounded metal conduit =

24
Q

2–44 cable separation

Min separation power lines enclosed, grounded metal conduit =

25
Q

2-44 cable separation

Metallic cabling and EMI source separation =

A

Fluorescent lamps, 5.12in

26
Q

2–51 telecom cabling joint use tunnel

Three components in joint use tunnel =

A

Except unbalanced DM fields, do not belong

27
Q

2–51 telecom cabling joint use tunnel

Coupling mutual capacitance/mutual conductance =

A

Except signal injector, does not belong

RCDD (24 decks)

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