(OLD) Ch 02 - Electromagnetic Compatibility

Question 0

2–2 EMC

Electromagnetic spectrum =
7

Answer 0

Light
radio waves 
microwaves
infrared (IR) radiation
ultraviolet rays
x-rays
gamma rays

Question 1

2–1 electromagnetic compatibility (EMC)

EMI =

Answer 1

Frequency overlap

Question 2

2–2 EMC

Electromagnetic spectrum visible lights =

Answer 2

10^15 (1PHz)

Question 3

2–3 EMC

Conducted coupling =

Answer 3

Except solid-state devices, does not belong

Question 4

2–4 EMC

Q: do electrical codes provide for EMC?

Answer 4

No

Question 5

2-2 electromagnetic spectrum

PHz =

Answer 5

Petahertz

Question 6

2–4 EMC

ITS designer =

Answer 6

Not directly responsible of EMS of ITS

Question 7

2–6 EMC electromagnetic

Internal EMI sources =

Answer 7

Except incandescent light fixtures, does not belong

Question 8

2–8 EMC

EMC measurement =

Answer 8

No techniques to measure

Question 9

2–16 EMC – the solution

EMI types =
2 and their examples

Answer 9

• man-made:
  Conversion
  distribution
  generators
• natural:
  Atmospheric electricity
  Cosmic radiation/geomagnetism disturbances

Question 10

2–19 EMC electromagnetic qualification parameters

ESD =

Answer 10

Electrostatic discharge

Question 11

2–19 EMC electromedical qualification parameter

type of ESD =

Answer 11

Discharge through a spark in the air

Question 12

2–27 EMC

CRT =
2

Answer 12

• cathode ray tube

* susceptible to RFI

Question 13

2–28 EMC unwanted signals

Types of unwanted signals in EMI =
2

Answer 13

• common-mode (CM)

* differential mode (DM)

Question 14

2–28 EMC unwanted signal

CM =
2

Answer 14

• Predominant unwanted signal

* locks up computer

Question 15

2–29 EMC unwanted signals

DM noise =

Answer 15

Correcting transmitting signals on a balance circuit

Question 16

2–51 telecom cabling joint use tunnel

Three components in joint use tunnel =

Answer 16

Except unbalanced DM fields, do not belong

Question 17

2–51 telecom cabling joint use tunnel

Coupling mutual capacitance/mutual conductance =

Answer 17

Except signal injector, does not belong

Question 18

2–20 EQP

Immunity contact L4 =

Answer 18

8kV

Question 19

2–44 cabling system

Minimum separation electrical motors and transformers =

Answer 19

47in

Question 20

2–44 cabling systems

Branch circuits of 5kVA =

Answer 20

No additional separation necessary

Question 21

2–20 EQP

Immunity Air L2 =

Answer 21

4kV

Question 22

2–44 cable separation

Minimum separation for unshielded power, nonmetal pathways =

Answer 22

24in

Question 23

2-44 cable separation

Metallic cabling and EMI source separation =

Answer 23

Fluorescent lamps, 5.12in

Question 24

2–44 cable separation

Min separation power lines enclosed, grounded metal conduit =

Answer 24

6in

Question 25

2–20 electromagnetic qualification parameters

Immunity contact L2 =

Answer 25

4kV

Question 26

2–44 cabling separation

Min. separation unshielded power, grounded metal conduit =

Answer 26

12in