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ELECTRICAL FINAL 3A EXAM FULLY SOLVED #6 2024
Refer to the 2020 edition of the NEC®. The demand load for four pieces of commercial cooking equipment is _____. - correct answer 80% Refer to the 2020 edition of the NEC®. Continuous loads are calculated at what percentage of the maximum current rating of the overcurrent device? - correct answer 80% Refer to the 2020 edition of the NEC®. What is the total load required by the NEC® for four appliance branch circuits plus a laundry branch circuit? - correct answer 7500VA Refer to the 2020 edition of the NEC®. The load center length for a branch circuit with noncontinuous loads of 125A at 80' from the source, 75A at 110' from the source, and 50A at 100' from the source is _____. - correct answer 93' Refer to the 2020 edition of the NEC®. What is the feeder load (in VA) for four small appliance branch circuits? - correct answer 6000VA Refer to the 2020 edition of the NEC®. What is the lighting load on a 120V circuit for six 100W incandescent lights and four fluorescent fixtures with a ballast rating of 1.5A, all operating continuously for 8 hours per day? - correct answer 13.75A Refer to the 2020 edition of the NEC®. What is the required branch circuit ampacity of a water heater with a nameplate rating of 7,200VA at 240V? - correct answer 37.5A Refer to the 2020 edition of the NEC®. What is the MINIMUM ampacity for the branch circuit conductors for a single-phase motor rated at 2hp, 230V? - correct answer 15A Refer to the 2020 edition of the NEC®. The MAXIMUM size dual-element fuse for a 40hp, 3Ø, 460V motor with a Design Letter D is _____. - correct answer 100A Refer to the 2020 edition of the NEC®. A sign load CANNOT exceed _____. - correct answer 80% of the branch circuit rating Refer to the 2020 edition of the NEC®. When space heating equipment uses electric resistance heating elements, protection for the resistance elements must NOT exceed _____. - correct answer 60A Refer to the 2020 edition of the NEC®. What is the motor full-load current for an induction type motor with a nameplate rating of 30hp, 460V, 3Ø? - correct answer 40A Refer to the 2020 edition of the NEC®. What is the feeder load (in VA) for the minimum number of small appliance branch circuits required in a residential kitchen? - correct answer 3000VA
Refer to the 2020 edition of the NEC®. For resistance welders, the rating for the overcurrent protection device should NOT exceed _____. - correct answer 300% of the primary current rating of the welder Refer to the 2020 edition of the NEC®. What is the required circuit ampacity of a noncontinuous, single-phase load of 8.5kw at 277V? - correct answer 30.69A Refer to the 2020 edition of the NEC®. The load for 30' of multi-outlet assembly used to supply several loads simultaneously is _____. - correct answer 5400VA Refer to the 2020 edition of the NEC®. The load center length for a 208V, four-wire, three-phase branch circuit with fixed noncontinuous loads of 60A at 45' from the source, 40A at 60' from the source, 30A at 75' from the source, and 25A at 100' from the source is _____. - correct answer 63.55' Refer to the 2020 edition of the NEC®. A noncontinuous load of three 120V outlets for heavy-duty lamp holders would have a load of _____. - correct answer 1800VA Refer to the 2020 edition of the NEC®. What is the voltage drop for a 120V, single- phase, two-wire branch circuit, 100' long, using copper conductors of 6,530 circular mils with a noncontinuous load of 13A? - correct answer 5.14V Refer to the 2020 edition of the NEC®. The total load of show windows must be calculated at NOT less than _____. - correct answer 200VA per linear foot of show window Refer to the 2020 edition of the NEC®. What is the total ampacity for a 120V branch circuit consisting of four duplex receptacles rated noncontinuous duty and four duplex receptacles rated continuous duty? - correct answer 13.5A Refer to the 2020 edition of the NEC®. What is the demand load for one household range with a nameplate rating of 10kw, 240V, 1Ø? - correct answer 8kw Refer to the 2020 edition of the NEC®. What is the current-carrying capacity for No. 6 THWN aluminum conductors in conduit run through an ambient temperature of 38°C? - correct answer 44A Refer to the 2020 edition of the NEC®. Air conditioning overcurrent protective devices can never exceed what percentage of the motor-rated load current or the branch circuit selection current (whichever is greater)? - correct answer 225% Refer to the 2020 edition of the NEC®. What is the demand factor for three commercial ranges? - correct answer 90% If a conductor has a diameter of 80 mils, its diameter in inches is _____. - correct answer 0.
NFPA 70E, Standard for Electrical Safety in the Workplace, provides guidance, such as determining severity of potential exposure, planning safe work practices, are-flash labeling, and selecting ____ - correct answer personal protective equipment As applied to electrical equipment, the term reconditioned may be interchangeable with the term ____. - correct answer any of these The ____ of any system is the ratio of the maximum demand of a system, or part of a system, to the total connected load of a system. - correct answer demand factor In the NEC, the word(s) "____" indicate a mandatory requirement. - correct answer shall or shall not This Code covers the installation of ____ for public and private premises, including buildings, structures, mobile homes, recreational vehicles, and floating buildings. - correct answer all of these Working space shall not be used for ____. - correct answer storage The conductors connected to the direct-current input of an inverter for PV systems form the ____. - correct answer inverter input circuit Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called "____" - correct answer enclosed Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so ____. - correct answer the purpose is evident Electrical equipment rooms or enclosures housing electrical apparatus that are controlled by a lock(s) shall be considered ____ to qualified persons. - correct answer accessible Part III of Article 100 contains definitions which are applicable to ____. - correct answer Hazardous (Classified) Locations A "____" is an accommodation that combines living, sleeping. Sanitary, and storage facilities within a compartment. - correct answer guest room A branch circuit that supplies only one utilization equipment is a(n) ____ branch circuit. - correct answer individual A multiwire branch circuit consists of ____. - correct answer all of these In judging equipment for approval, considerations such as ____ shall be evaluated. - correct answer all of these
Electrical hazards often occur because the initial ____ did not provide for increases in the use of electricity and therefore wiring systems become overloaded. - correct answer wiring Composite optical fiber cables contain optical fibers and ____. - correct answer current- carrying electrical conductors For large equipment that contains service disconnecting means installed in accordance with 230.71 where the combined ampere rating is ____ amprees or more and over 6 ft. Wide, there shall be one entrance to and egress from the required working space not less than 24 in. Wide and 6 1/2 ft high at each end of the working space. - correct answer 1200 Separately installed pressure connectors shall be used with conductors at the ____ not exceeding the ampacity at the listed and identified temperature rating of the connector. - correct answer ampacities The basic measure of the amount of light produced by a light source is called the _____. - correct answer lumen Corridor lighting levels in the public areas of a building should have at least _____. - correct answer 20% of the illuminance level of the adjacent areas When 60% to 90% of the luminaire's emitted light is directed downward but also 10% to 40% is upward toward the ceiling, this is _____. - correct answer direct lighting The type of lamp that can be used in a large flexible sheet is a(n) _____. - correct answer LED Which of the following are often used in conjunction with time clocks to turn off lighting when it is no longer needed? - correct answer Occupancy sensors The classification of an area as being hazardous with regard to the installation of lighting fixtures is the responsibility of the insurance company, authority having jurisdiction, or _____. - correct answer owner A luminaire with a 2x3 light distribution pattern is a narrow flood according to _____. - correct answer NEMA classifications Which of the following is MOST important in choosing the type of luminaire for general illumination in patient observation areas in a health care facility? - correct answer Good color rendition Lighting that uses fixtures above the visual task area that also contributes to the lighting in the local area is classified as _____. - correct answer localized general lighting
Locations in which flammable gases or vapors may be present in the air in quantities sufficient to produce explosive or ignitable mixtures are identified as _____. - correct answer Class I locations Anesthetizing locations of hospitals are considered to be Class I, Division 1 locations to a maximum height of _____. - correct answer 5' above the floor The space immediately beneath a motor fuel dispensing unit at an automotive service station is identified as a _____. - correct answer Class I, Division 1 location Which of the following BEST describes the devices that will help prevent moisture from collecting in raceway systems? - correct answer Integral drains In hazardous locations where threaded metal conduit is required, threaded joints must be made up with at least how many threads fully engaged? - correct answer 5 At the time of installation, grounded conductors ____ or larger can be identified by distinctive white or gray markings at their terminations. - correct answer 4 AWG The minimum clearance for overhead service conductors not exceeding 600V that pass over commercial areas subject to truck traffic is ____ ft. - correct answer 18 Service-entrance and overhead service conductors shall be arranged so that ____ will not enter the service raceway or equipment. - correct answer water Overhead service conductors shall have a minimum vertical clearance of ____ ft from final grade over residential property and driveways, as well as over commercial areas not subject to truck traffic where the voltage does not exceed 300 volts-to-ground. - correct answer 12 For attics and underfloor spaces, utility rooms, and basements in all occupancies, at least ____ lighting outlet(s) containing a switch or controlled by a wall switch shall be installed where these spaces are used for storage or contain equipment requiring servicing. - correct answer one The 125 percent multiplier for a continuous load as specified in 210.20(a) ____ included when using the unit loads in table 220.12 for calculating the minimum lighting load for a specified occupancy. - correct answer is Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if the tap conductors _____. - correct answer all of these Overhead service conductors shall have a minimum clearance from final grade of ____ above areas or sidewalks accessible only to pedestrians, measured from final grade or
other accessible surface where the voltage does not exceed 150 volts to ground. - correct answer 10 ft Where the lighting load of a nondwelling building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated using the unit values specified in the _____. - correct answer energy code If a 20A branch circuit supplies multiple receptacles, the receptacles shall have an ampere rating of no less than ____. - correct answer 15A The size of the grounding electrode conductor for a building or structure supplied by a feeder shall not be smaller than that identified in ____, based on the largest ungrounded supply conductor. - correct answer 250. For installations that supply only limited loads of a single branch circuit, the service disconnecting means shall have a rating not less than ____. - correct answer 15A In an ac system, if the size of the grounding electrode conductor or bonding jumper connected to a concrete-encase electrode does not extend on to other types of electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than ____ AWG copper. - correct answer 4 Concrete-encased electrodes of ____ shall not be required to be part of the grounding electrode system where the steel reinforcing bars or rods aren't accessible for use without disturbing the concrete. - correct answer existing buildings or structures 120V, single-phase, 15A and 20A branch circuits supplying outlets and devices installed in ____ of hotels and motels shall be protected by any of the means described in 210.12(A)(1) through (6). - correct answer guest rooms For a separate building or structure supplied by a separately derived system when overcurrent protection is not provided for the supply conductors to the building/ structure as permitted by 240.21(C)(4), the installation shall be ____ in accordance with 250.30(A). - correct answer grounded and bonded In grounded systems, normally noncurrent-carrying electrically conductive materials that are likely to become energized shall be connected ____ in a manner that establishes an effective ground-fault current path. - correct answer together and to the electrical supply source A(n) ____ shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box. - correct answer equipment bonding jumper Rod and pipe grounding electrodes shall not be less than ____ in length. - correct answer 8 ft
The type of fuse used to prevent nuisance tripping from temporary motor overloads and surge currents is a(n) _____. - correct answer dual-element, time-delay fuse A conductor with failed insulation contacts the metal edge of a grounded metal wireway. This is known as a(n) _____. - correct answer ground fault Which of the following is within the basic scope of Underwriters Laboratories? - correct answer Safety A 500A circuit breaker has a frame size of _____. - correct answer 1,000A The thermal portion of a standard circuit breaker _____. - correct answer protects the circuit from heat damage generated by lower level currents For 480V circuits, the arc current seldom exceeds _____. - correct answer 60% of the available bolted fault current A feeder circuit with no motor load has a continuous load of 16A and a noncontinuous load of 10A. The feeder overcurrent protective device should be sized at _____. - correct answer 30A When tripped, the circuit breaker handle moves _____. - correct answer halfway between the On and Off positions If a continuous load on a branch circuit is measured at 12A, the overcurrent protection should be sized at _____. - correct answer 15A One of the first signs of worn motor bearings is MOST likely to be a(n) _____. - correct answer continuous overload The recommended method of determining short circuit currents is the _____. - correct answer point-to-point method Types of fault current include overloads, short circuits, ground faults, and _____. - correct answer arc faults A device that is designed to withstand numerous trip and reset cycles without replacement and can be thermal, magnetic, or solid-state is a(n) _____. - correct answer overload relay If a 120V feeder for nonmotor loads feeds a continuous load rated at 20A and a noncontinuous load at 25A, what size overcurrent protective device should be selected?
The magnetic portion of a standard circuit breaker _____. - correct answer provides an instantaneous trip for high levels of current Which of the following is commonly referred to as motor branch circuit protection? - correct answer Short circuit protection Overcurrent protection is covered in _____. - correct answer NEC Article 240
