Electricians Helpers exam Questions And Answers Rated 100%!!!

In the American wire gauge, the CMA doubles every - ANS 3 wire sizes That portion of a wiring system extending beyond the final overcurrent device is called - ANS Branch Circuit As compared to a #10, a #8 wire of the same length has less - ANS Resistance The resistance of copper wire is - ANS Inversely proportional to its length The reciprocal of resistance is - ANS Conductance The combination of resistance, capacitance and inductance of an A.C Circuit is known as - ANS Impedance The perfect insulating material for electrical use is - ANS Rubber Electrical equipment may be fastened to solid masonry with - ANS Expansion Anchors A tool commonly used to anchor equipment to a masonry wall is - ANS Expansion Anchor Small cuts or injuries should be - ANS Cared for immediately because infection may result Which is not a safe practice for lifting heavy objects - ANS If there is feeling of restraint, continue lifting until you get help When three resistances each of a different value are connected in parallel, the total resistance of the combination is - ANS Equal to the average resistance The lubricant commonly used to make it easier to pull braid covered cable into a duct is - ANS Soapstone In loosening a nut, a socket wrench with a ratchet handle should be in preference to other types of wrenches if - ANS The turning space for the handle is limited Another name for a pipe wrench is a - ANS Stillson wrench The tool used to cut raceways is a hacksaw with fine teeth, commonly known as - ANS Tube saw Lead expansion anchors are commonly used to fasten conduit to a - ANS Solid concrete wall Definite time relays operate - ANS At the same speed for an overload of any value Solders used for electrical connections are alloys of - ANS Tin and lead The use of "running" threads when coupling two sections of conduit - ANS Always poor practice A quick-break knife switch is often used rather than a standard-knife switch of the same rating because the quick-break switch - ANS Resists buring, due to arcing at the contacts points The main contributing factor to motor started-failures usually is - ANS Dirt The best way to join two lengths of conduit which cannot be turned is - ANS Use conduit union (Erickson) When an electrical splice is wrapped with both rubber tape and friction tape, the main purpose of the friction tape us to - ANS Protect the rubber tape To measure the current in a conductor without breaking into the conductor you would use an - ANS Amprobe In American Wire Gauge (A.W.G), any wire has double the cross-sectional area of any other wire whose gage number is - ANS 3 greater than the first wire Of the following metals, the one which has the lowest resistivity at 20 degrees is - ANS Aluminum As the temperature increases, the - ANS Electrical resistance of both carbon and copper increases The type of equipment which is defined in the Code as a set of conductors originating at the load side of the service equipment and supplying the main and/or one or more secondary distribution centers is a - ANS feeder The neutral or grounded conductors in branch circuit wiring must be identified by being colored - ANS White or gray A watt-meter is used to measure - ANS Energy A 277 volt light circuit may not be used to supply - ANS Standard medium base In a three wire attachment plug - ANS One terminal must be identified An insulated wire shall have its AWG marking repeated every - ANS Two feet The conductor having the highest capacity is - ANS TFE A circuit breaker is said to be trip-free if - ANS it will not remain closed under overload A wire that has a maximum operating temperature of 167F is type - ANS RHW A fuse or circuit breaker should be provided at every point where - ANS A change is made in the size of the wire Plug fuses that have a hexagonal shaped window, have a maximum rating of - ANS 15 amps