Electrician Practice Exam with Complete Solutions

An electrical appliance is rated at 1,500 watts, and is connected to 120 volts. What is the resistance associated with this appliance? - ANSWER-9.6 ohms What is the greatest root-mean-square (effective) difference of potential between any two conductors of a circuit defined as? - ANSWER-Voltage Approximately how many kilowatts are used by a three-phase, 480-volt ac motor that draws a current of 52 amperes and has a power factor rating of 88%? - ANSWER-38 kW What is an askarel? - ANSWER-A group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media One horsepower is equal to how many watts? - ANSWER-746 How many amperes does a 3-hp, 240-volt, 3-phase motor draw if the motor has values of 90% efficiency and 95% power factor? - ANSWER-6.3 amperes A resistor has the following colored bands (in order): orange, red, brown, silver. What is the resistor value? - ANSWER-320 Ohms (10% tolerance) A continuous load is a load where the maximum current is expected to continue for at least how long? - ANSWER-3 hours How far shall the work space extend from the grade, floor, or platform for equipment that is 60 inches in height? - ANSWER-78 inches Where metallic plugs or plates are used with nonmetallic enclosures, how far shall they be recessed from the outer surface of the enclosure? - ANSWER-1/4 inch For other than a totally enclosed switchboard or switchgear, what is the minimum amount of space that shall be provided between the top of an unshielded switchboard or switchgear and any combustible ceiling? - ANSWER-36 inches Receptacles in residential units shall be installed such that no point measured horizontally along the floor line of any wall space is more than how far from a receptacle outlet? - ANSWER-6 feet What is the minimum size overhead conductor that can be used for festoon lighting that is not supported by messenger wires? - ANSWER-12 AWG