NM ES-3 EXAM COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) A+ GRADED
Wiring System - ANSWER Is a form of electrical circuit.Electrical circuit - ANSWER Is comprised of an energy source, energy transfer medium and a load.Energy Transfer Medium - ANSWER copper wire, fiber optic cables and air in the case of radiated energy Load - ANSWER receives the transferred energy such as resistors, lights, speakers, motors, etc.EMF (electromotive force) - ANSWER The force that moves electrical energy. 1 / 3
Current or Current Flow - ANSWER The movement of electrons through a circuit that is caused by the electromotive force or voltage applied to the circuit.Inductance (L) - ANSWER Unit is the henry. It is the property of a circuit that causes an opposition to any change of current within the circuit. As electrons flow, a magnetic field is produced. The magnetic force induces a change in voltage.Grounding - ANSWER assures transmission of electrical signals without interference from electromagnetic radiation from other transmission lines and equipment. This interference, called crosstalk, can happen from adjacent lines, motors, PCs, lights and other devices.Grounding electrode - ANSWER Connection to the electrode should be less than 1 ft below the surface of the solid and the electrode should extend at least 10 ft below ground.Ground Loop - ANSWER Causes a current to flow in the low resistance of the shield resulting in electromagnetic waves that are picked up as noise through the wire. 2 / 3
66 block - ANSWER A punchdown block that terminates 22 to 26 AWG solid copper wire. The 25 pair standard non split 66 block contains 50 rows.110 block - ANSWER To terminate on-premises wiring in structured cabling. IDC or Insulation displacement contact connector is used to terminate the twisted pair. The 110 allows for a much higher density of terminations, less crosstalk and higher bandwidth data.UF - ANSWER Cable can be buried into the ground. Not approved for commercial use in
NM. 340.10
Balun - ANSWER A means of matching an unbalanced antenna or transmission line to a balanced transmission line or antenna (Usually have a transformer in them) Bus Topology - ANSWER All nodes are connected to a single shared communication line Ring Topology - ANSWER Topology where the computers are connected on a loop or ring.
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