Master Electrician Exam Review Questions With Complete Solutions

branch circuit - ANS That portion of a wiring system extending beyond the final overcurrent device is called the: Calculated load - ANS The final sum of the computed loads, based on the minimum code requirements, is the Resistance - ANS As compared to #10, a #8 wire of the same Iength has less: 0.001 inch - ANS One circular mil is the area of a circle whose diameter is: 1,000,000 cm - ANS A round bus-bar one inch in diameter, has a circular mil area of: four times as great - ANS A copper wire with twice the diameter of another wire has a current carrying capacity: 10.4 - ANS The specific resistance of copper wire @ 20° C in ohms per circular mil ft. is permit current to flow - ANS Conductance of an electric circuit is that property that will: 1O ohms - ANS The equivalent value of 0.1 mho is directly proportional to its length - ANS The resistance of copper wire is: Feeder - ANS The portion of a wiring system between a point of distribution and the branch circuit overcurrent device is locking - ANS GFCI protection at a carnival is not required for equipment at circuit if the receptacle is of the ____________type not less than 1 1/4 in. from - ANS Where cables or nonmetallic raceways are installed through in joists, rafters, or wood members;holes shall be bored so that the edge of the hole is the nearest edge -of the wood member. located on a balcony accessible only to qualified persons located in a room only accessible to qualified persons elevated 8 ft or more above floor or other working surface - ANS To guard live parts over 50V but less than 600V, equipment is permitted to be 12Ft - ANS Overhead feeder conductors shall have a minimum __________ vertical clearance over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage is limited to 300 volts-to-ground. 36 inches - ANS Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of horizontally shall be provided. 50' - ANS What is the maximum run length of a 18AWG fixture wire that is tapped on to a 20 amp branch circuit? power supply failure - ANS When the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a 2 in of concrete - ANS Conductors are considered outside a buildings when they are buried under not less than 8 - ANS In straight pull, the length of the box shall not be less than. ____times the trade size of the largest raceway. 18" - ANS At least one receptacle outlet shall be installed within of the top of a show window for each 12 linear feet measured horizontally across its length 1000A - ANS Ground-fault protection of equipment shall be provided fro solidly grounded wye electrical services of more than 150 volts-to-ground, but not exceeding 600V phase-to..phase for each service disconnecting means rated 18" - ANS Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within ______ of the wall 50V - ANS Exposed live parts of motors and controllers operating at or more between terminals shall be guarded against accidental contact by enclosure or by location 5' - ANS Lighting track shall not be installed less than______ above the finished floor except' where protected from physical damage or where the track operates at less than 30 V rms, open-circuit voltage 4 - ANS Each general care area patient bed location shall be provided with a minimum of_______receptacles, which can be single, duplex, or a combination with each duplex counting as two receptacles Combination Range hood/ Microwave oven - ANS In a Dwelling Unit which appliance is allowed to have a 24" cord with attachment ground plug? 1 - ANS At least_____ 125 V, single phase, 15 A or 20 A, duplex with ground-fault circuit interrupter receptacle shall be provided in each elevator machine room and elevator machinery space. 25A - ANS Lighting systems covered by Article 411 shall have a power supply rated not more than______and not more than 30V 90 - ANS Temporary electrical power and lighting installations shall be permitted for a period not exceeding ____days for Christmas decorative lighting and similar purposes 10' - ANS Lighting systems operating at 30V or less shall not be·installed within_______of pools, spas, fountains, or similar locatipns 12 /40 - ANS Where communications wires and cables and electric light or power conductors are supported by the same pole and are run paralled to each other in span , the·supply service drops of 0-750 volts running above and parallel to communications service drops shall have a minimum separation of _______inches at any point in the span, including the point of and at their attachment to the building, provided the nongrounded conductors are insulated and that a clearance of not less than_______ inches is maintained between the two services at the pole 8 - ANS Communications Wires and cables shall have a vertical clearance of not less the ______feet from all points of roofs above which they pass. Cable Tray - ANS MV cable rated 35 KV cannot be installed in in a straight line - ANS The grounding of communications wires should be run to the grounding electrode: 10 AWG Copper - ANS Service Lateral conductors that supply power to limited loads of a single branch circuit-such as a small polyphase power, controlled water heaters, and similar loads-shall not be smaller than 35KV - ANS Dry type transformers installed indoors rated over._______ shall be installed in a vault. 1 1/2" - ANS Flat:top underfloor raceways over 4 inches, but less 8 inches wide, with a minimum 1 inch spacing between raceways, shall be covered with concrete to a depth of not iess than 1 inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of