Chapter 2 EMI and EMC - Cabling, Problem, & Solution

Question 1

WHAT DESIGN FACTOR COULD CAUSE EMI ON INERCONNECTING TELECOMUNICATION CABLES?

Answer 1

EXCESSIVE LENGTHS OF UNSHIELDED CABLE BETWEEN ROOMS OF BUILDINGS.

Question 2

WHAT FOUR DESIGN FACTORS COULD CAUSE EMI ON A SITE’S ICT OSP CABLE DISTRIBUTION SYSTEM?

Answer 2

1. UNBALANCED CABLING.
2. INCORRECT OR MISSING PRIMARY PROTECTORS.
3. INCOMPATATIBLE SECONDARY PROTECTORS.
4. INCORRECT OR MISSING GROUNDS.

Question 3

WHAT IS THE AIM OF EMC?

Answer 3

TO UNSURE THAT EQUIPMENT INTEMS OR SYSTEMS WILL NOT INTERFERE WITH OR PREVENT EACH OTHER’S OPERATION THOUGH SPURIOUS EMISSION AND ABSORBTION OF EMI.

Question 4

WHAT IS THE FOCUS OF EMC?

Answer 4

TO CONTORL EMI.

Question 5

TRUE OR FALSE - EMI IS OFTEN EASY TO REMEDY ONCE THE ROOT CAUSE IS IDENTIFIED.

Answer 5

TRUE - EMI IS OFTEN EASY TO REMEDY ONCE THE ROOT CAUSE IS IDENTIFIED.

Question 6

NAME THE SOURCES OF EMI PROBLEMS?

Answer 6

CONDUCTED OR RADIATED EMISSION SOURCES.

Question 7

NAME TWO NATURAL SOURCES OF EMI?

Answer 7

1. ATMOSPHEREIC ELECTRICITY.
2. COSMIC RADIATION OR GEOMAGNETISM DISTURBANCES.

Question 8

NAME SIX MAN-MADE SOURCES OF EMI?

Answer 8

1. ELECTRIC POWER
2. COMMUNICATIONS ELECTRONIS
3. REPLAY COMMUNICATIONS
4. TOOLS AND MACHINES
5. INGNITION SYSTEMS
6. INDUSTRIAL AND CONSUMER EUIPMENT OR PRODUCTS (NON-MOTOR/ENGINES)

Question 9

NAME THREE METHODS USED TO SURPRESS OR PREVENT UNWANTED SIGNALS?

Answer 9

1. SHIELDING
2. FILTERING
3. BONDING AND GROUNDING (EARTHING) OF CABLKES SHIELDS AND EQUIPMENT.