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Electrical NCCER test
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 3
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
Which of the following is the classified location where combustible vapors are always present? - ANSWER class I Div I
With a row of 3-4" conduits and second row of 3-2" and 2-1" conduits for an angle pull box what is the MINIMUM distance between the opposite walls of the pull box? - ANSWER 32"
Exposed field-routed electrical conduit SHOULD be installed so that it: - ANSWER is plumb and level
When wiring control push button control circuit, the auxiliary holding contact (seal-in) is wired with the start button in: - ANSWER parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against: - ANSWER corrosion
Which of the following factors is used to control the speed of an induction motor? - ANSWER Frequency
Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded UNLESS the: - ANSWER tool is double-insulated and is approved by an independent testing facility.
A conductor with 220 mils of insulation would have insulation thickness of: - ANSWER 0.22"
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
The conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system is called a grounding: - ANSWER electrode conductor
A material with poor electrical conducting properties is a good - ANSWER insulator
A current transformer has a rating of 4000:5. If 2000 amps load is on the primary, the secondary output would produce: - ANSWER 2.5 amps
A 1500 KVA three-phase transformer has a secondary voltage of 480/277. What is the secondary full load amperage - ANSWER
Type LB conduit body has the cover on: - ANSWER the back
What is the purpose of lockout/tagout? - ANSWER prevent operation
Why should the proper rope be selected for a cable pull? - ANSWER to maximize safety
An electrician that attempts to install or remove energized fuses will be exposed to the risk of an electrical shock and an electrical: - ANSWER arc.
What is the approximate developed length of a 40" radius 90" bend? - ANSWER 63
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
Insulation on the barrel of crimp connectors for wires sized 22-16 AWG are typically colored: - ANSWER red
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
