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In a guardrail system, the guardrails can be made of any of the following EXCEPT: - answer>>>ropebanding If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the circuit is: - answer>>>9.6 ohms A UL listed rod type grounding electrode must have a minimum length of: - answer>>>8' What is the MINIMUM number of overload sensing units required for all three phase motors? - answer>>> In a circuit of pure capacitance, the current leads the voltage by an angle of: - answer>>>90-degrees The standard unit for a measuring the cross-sectional area of a wire is the: - answer>>>circular mil The drawing scale is MOST likely to be found in which of the following drawing locations? - answer>>>the drawing little block
The length of a bare copper conductor in a ground ring MUST be buried no less than 2.5' below grade and with a length of at least: - answer>>>20 ft. When installing heating cables for anti-icing systems, cable patters should be in a: - answer>>>Serpentine An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal marking: - answer>>>A1 & A The neutral bus in a sub panel: - answer>>>is bonded The PEAK voltage in a nominal 120/208 VAC system is: - answer>>>208V. THWN conductors have an outer jacket made of: - answer>>>nylon What is shown on a sectional drawing? - answer>>>Cutaway view of a building Who is allowed to remove another electrician's tag or lock from any valve, switch, or piece of equipment without proper authorization? - answer>>>no one. The MAIN purpose of a revision block on an electrical drawing is to: - answer>>>note any changes to the original drawings
A conductor with 220 mils of insulation would have insulation thickness of: - answer>>>0.22" What is the purpose of sealing cable ends that are in storage? - answer>>>to keep moisture from entering it Which one of the fuses is a standard size according to the NEC? - answer>>> A 1000 KVA three phase transformer has a secondary voltage of 208/120. What is the secondary full load amperage? - answer>>> A megohmmeter will be used to check a cable. The electrician MUST be sure that the circuit is - answer>>>de-energized and locked, tagged out, and tested. A protective device for limiting voltage spikes by discharging or bypassing surge current is called a: - answer>>>surge limiter What is the resultant distance between center bends for a 10-inch offset at 15 degrees? - answer>>>38.7 In. What is the symbol for the SECONDARY side of a transformer? - answer>>>x
The most common transformer found on an industrial site is: - answer>>>Single phase step down Applications for heat tracing systems with self regulating control include those requiring a narrow operating range and: - answer>>>temperature sensitive fluids With a row of 3-4" conduits and second row of 3-2" and 1-1" conduits on each side for a straight pull box what is the MINIMUM distance between the opposite walls of the pull box? - answer>>>32" As the mechanical load increases on a squirrel cage induction motor: - answer>>>torque decreases and stator current increases When installing cables smaller than 4/0 in a cable tray, the allowable cable fill area must not be less than the sum of the cable: - answer>>>cross-sectional areas. The meter used to measure pulling tension is known as: - answer>>>dynamometer On a push button, normally close contacts are generally used to open a circuit to : - answer>>>initiate a stop or off circuit function How should heat-shrink insulators be installed? - answer>>>the insulator should be slipped over the connector and heat should be applied for a few seconds
What is the approximate developed length of a 40" radius 90" bend? - answer>>> Which of the following is the classified location where combustible dust may be present? - answer>>>Class I Div I Which of the following is the classified location where combustible fibers are always present? - answer>>>Class III, Div When installing more than one ground rod, what is the MINIMUM spacing between rods? - answer>>>6 ft. How does a battery produce voltage? - answer>>>electromagnetism As the load decreases on a squirrel cage induction motor, its power factor: - answer>>>increases A voltage source of a circuit provides 240 volts and draws 48 amps. How much resistance is in the circuit? - answer>>>5 ohms When re-setting a circuit breaker, where should the worker stand? - answer>>>on the handle side What size of wire is needed for a 120V circuit 215 feet long one way with a load of 39 amps - answer>>>#
Which of the following conductors has the LEAST resistance? - answer>>># What is the primary consideration in selecting the rope for a cable pull? - answer>>>low stretch When installing 4/0 and larger cables in a cable tray, the tray width must NOT be less than the sum of the cable: - answer>>>diameter Rubber personnel protective insulating equipment must be marked with the appropriate voltage rating and: - answer>>>current rating Why should the test leads of a "megger" NEVER be touched by anyone when in use? - answer>>>it could result in an electrical shock Eight incandescent lightning fixtures are to be installed. Each fixture is 120 volts, with a 200-watt lamp. What is the total connected load? - answer>>>13.3 amps A lightning outlet symbol in the shape of a circle indicated a: - answer>>>incandescent fixture The material between the capacitor plates in which an electric field appears is the: - answer>>>dielectric
Which of the following heat trace cables may not be cut to length during installation in the field? - answer>>> Electrical gloves should be inspected before each use to determine: - answer>>>the maximum voltage they can stand Which type of rigid metal conduit would be most appropriate for a corrosive environment? - answer>>>Aliminum When terminating fire alarm, instrumentation, or control cables that contain a shielding drain wire, this drain wire must be: - answer>>>insulated to build an offset in a cable tray system, use four: - answer>>>swivel plates Which electrical values CANNOT be tested using a VOM (MULTIMETER)? - answer>>>Watts As the ambient temperature surrounding a self-regulating heating cable gets warmer, the resistance: - answer>>>decreases slightly True1 power is measured in: - answer>>>watts When stepping down voltages from 480 to 120/208 Y, the XO terminal of the transformer MUST BE: - answer>>>taped
The conducting object through which a direct connection to earth is established is called a grounding: - answer>>>electrode What is Type USE cable PRIMARILY used for? - answer>>>direct burial in the earth The type of support that would be used to eliminate the need to offset the conduit where there is a fitting is a: - answer>>>standoff support What is insulating tapE? - answer>>>nonconductive adhesive tape What is the approximate total current of a circuit with a voltage of 100 volts across five resistors in parallel (10, 15, 20, 25, and 100 ohms)? - answer>>>27 amps Where raceways connect an enclosure required to be dust/ignition proof to an enclosure in an UNCLASSIFIED location, seals are: - answer>>>always required What is the voltage drop for a #8 copper wire at 120v, 215 feet one way, and a load of 39 amps? - answer>>>
