RCDD CH2 ELECTROMAGNETIC COMPATIBILITY EXAM QUESTIONS AND ANSWERS.

A A customer that has an EMI issue requested a site survey. During the survey you found the electrical power for the site was installed in nonmetallic raceway causing what type of EMI site issue? A - Commercial and Standby alternating current B - Feeder Distribution C - Electrical Service Entrance D - Branch Distribution Page 2-14 D What is the minimum separation distance that must be maintained between a cable pathway and a 10kVA transformer? A - ≈150 mm (6 in) B - ≈300 mm (12 in) C - ≈600 mm (24 in) D - ≈1220 mm (48 in) Page 2-44 A What type of coupling occurs as a result of electric fields? A - Capacitive B - Inductive C - Electromagnetic D - Conductive Page 2-1 A What type of energy has frequency higher than the visible light? A - Ultraviolet B - Radar C - Microwaves D - Infrared Page 2-2 A Which of the following is an internal EMI source? A - Digital signal processors B - Cellular phones C - Electric motors D - Radar Page 2-6 A A customer has requested a site survey. During the survey, you found that the grounding (earthing) electrodes were missing. What type of electromagnetic interference (EMI) site issue have you discovered? A - Electrical service entrance B - Branch distribution C - Load power conditioning D - EMI emitters Page 2-14 C What is the maximum acceptable electric field strength for general-purpose telecommunications equipment and cabling? A - 1 V/m B - 2 V/m C - 3 V/m D - 4 V/m Page 2-11 A What is the minimum separation distance that must be maintained between metallic cabling and fluorescent lamps? A - ≈125 mm (5 in) B - ≈780 mm (31 in) C - ≈1000 mm (39 in) D - ≈1220 mm (48 in) Page 2-45 A What type of disturbance is created when inductive and capacitive circuits are switched on and off over an operation cycle? A - Electrical fast transient B - Electrical surges C - Electrostatic discharge D - Unwanted signals Page 2-26 A Which of the following is the most immune to the effects of electromagnetic interference (EMI)? A - Optical fiber B - Unshielded twisted-pair C - Overall unshielded twisted-pair with foil screened twisted-pair D - Overall braid and foil screened with unshielded twisted-pair