Master Electrical Closed Book Exam Questions and Answers 100% Correct!

XC - ANSWER-______ is the letter(s) used to indicate capacitive reactance in a circuit. A) XL, B) Z, C) HZ, D) XC Conductors drawn from a copper-clad aluminum rod with the copper metallurgically bonded to an aluminum core. The copper forms a minimum of ________ percent of the csa. - ANSWER-10 Relay contacts are made of ___________. - ANSWER-Silver Defined apparatus - ANSWER-The organization or system used for doing or operating something Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of a rated capacity which, when it persists for a sufficient length of time, would cause damage or dangerous overheating is called __________. - ANSWER-An overload In an AC circuit a value of watts divided by a value of volt-amps, what should the power factor be to indicate close to unity? - ANSWER-( high power factor) = having a high power factor, tells you, that the POWER FACTOR is close to unity(1.0). Which is what you want in a circuit. Because that means that the power is IN PHASE and this is called TRUE POWER. We don't want to have a low power factor, because that means the circuit power is OUT OF PHASE , meaning that you have to much inductance or capacitance, which is called APPARENT POWER. A transformer core is made of_________. - ANSWER-Steel Flexible metal conduit shall be secured by an proved means at intervals not exceeding ___________ feet and within 12" on each side of every outlet box , junction box, cabinet, or fitting. - ANSWER-4 1/2 An insulated conductor with a white or gray finish shall be permitted as _________ or _______ conductor where permanently reidentified to indicate its use, by painting or other effective means at its termination and at each location where the conductor is visible and accessible - ANSWER-Hot or ungrounded If the DC resistance of a #500 kcmil copper conductor 1000 feet in length is .0258 ohm, the DC resistance for a #1000 kcmil copper conductor 1000 feet in length would be ________ ohm. - ANSWER-0.0129, is because if you double the cross-sectional area (csa) of a conductor it will reduce the resistance by 1/2. .0258/2= .0129 Metal cabinets used for lighting circuit are grounded in order to _________or ______. - ANSWER-Limit the voltage to ground or facilitate overcurrent device operation Encased with a material or composition or thickness that is not recognized by the code as electrical insulation is defined as a covered ______. - ANSWER-Conductor A overcurrent trip unit of a circuit breaker shall be connected in series with each _____. - ANSWER-Ungrounded conductor Receptacle outlets in a residence shall be installed so that no point along the floor line in any wall space is ______,measured horizontally, from an outlet in that space. - ANSWER-More than 6' In a 2-wire, 120v circuit, the black wire (hot) is a _______ conductor and the white wire is a ______ conductor. - ANSWER-Ungrounded, grounded Grounding conductor shall not be connected by_______. - ANSWER-Soldered fittings You have 120v at the panel and 115v at the load. What is the percentage of voltage drop? - ANSWER-4.17%, (120v-115v=5v), you take the difference which is 5v, and divide it by your original voltage 120v, 5v/120v=.0417, 4.17% The ampacity of a solid or stranded conductor of the same material is the same if it has th