Master Electrician EXAM TEST QUESTIONS with verified answers 100%

Master Electrician EXAM TEST QUESTIONS with verified answers 100% Asbestos is commonly used as the covering of electric wires in locations where there is likely to be high a. voltage b. temperature c. humidity d. current - ANSWER b. temperature Overloading insulated wire or cable for long periods of time is considered poor practice because it usually causes a. over expansion of the conductor b. the conductor to melt c. damage to the duct or conduit d. the insulation to deteriorate - ANSWER d. the insulation to deteriorate Rubber insulation on an electrical conductor would most quickly be damaged by continuous contact with a. acid b. water c. oil d. alkali - ANSWER c. oil In measuring to determine the size of a stranded insulated conductor, the proper place to use the wire gauge is on a. the insulation b. the outer covering c. the stranded conductor d. one strand of the conductor - ANSWER d. one strand of the conductor The material which is least likely to be found in use as the outer covering of rubber insulated wires or cables is a. cotton b. varnished cambric c. lead d. neoprene - ANSWER b. varnished cambric Circulating shaft currents through the bearings of a turbo-generator will cause pitting and deterioration of the bearing surface, these circulating currents are stopped by a. having an insulating pad under one generator pedestal b. the insulating property of the lubricating oil c. insulating the shaft from the machine frame d. having an insulating section in the shaft - ANSWER a. having an insulating pad under one generator pedestal The life of insulation used in electrical installations is directly affected by heat. Of the following, the electrical insulation which can least withstand heat is a. enamel b. rubber c. fiberglass d. mica - ANSWER b. rubber One advantage of rubber insulation is that it a. does not deteriorate with age b. is able to withstand high temperatures c. does not absorb much moisture d. is not damaged by oil - ANSWER c. does not absorb much moisture After a new series lighting circuit has been completely installed, but before any lamps are in place, a standard lamp bank is connected across the fuse clips with the fuse out, and the circuit switch is closed. Lamps are then screwed into the sockets of one series, one lamp at a time, starting at the ground end. If there is a ground on any series wire, the lamp bank will light when the a. first lamp is screwed in b. lamp on the low side of the ground is screwed in c. lamp on the high side of the ground is screwed in d. last lamp is