ELECTRICAL NCCER EXAM PRACTICE
QUESTIONS WITH VERIFIED ANSWERS
In a guardrail system, the guardrails can be made of any of the following EXCEPT:
ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the
circuit is:
9.6 ohms
A UL listed rod type grounding electrode must have a minimum length of:
8'
What is the MINIMUM number of overload sensing units required for all three phase
motors?
3
In a circuit of pure capacitance, the current leads the voltage by an angle of:
90-degrees
The standard unit for a measuring the cross-sectional area of a wire is the:
circular mil
The drawing scale is MOST likely to be found in which of the following drawing locations?
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:
20 ft.
When installing heating cables for anti-icing systems, cable patters should be in a:
Serpentine
An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal
marking:
A1 & A2
The neutral bus in a sub panel:
is bonded
The PEAK voltage in a nominal 120/208 VAC system is:
, 208V.
THWN conductors have an outer jacket made of:
nylon
What is shown on a sectional drawing?
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?
no one.
The MAIN purpose of a revision block on an electrical drawing is to:
note any changes to the original drawings
Which of the following is the classified location where combustible vapors are always
present?
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?
32"
Exposed field-routed electrical conduit SHOULD be installed so that it:
is plumb and level
When wiring control push button control circuit, the auxiliary holding contact (seal-in) is
wired with the start button in:
parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against:
corrosion
Which of the following factors is used to control the speed of an induction motor?
Frequency
Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded
UNLESS the:
tool is double-insulated and is approved by an independent testing facility.
A conductor with 220 mils of insulation would have insulation thickness of:
0.22"
QUESTIONS WITH VERIFIED ANSWERS
In a guardrail system, the guardrails can be made of any of the following EXCEPT:
ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the
circuit is:
9.6 ohms
A UL listed rod type grounding electrode must have a minimum length of:
8'
What is the MINIMUM number of overload sensing units required for all three phase
motors?
3
In a circuit of pure capacitance, the current leads the voltage by an angle of:
90-degrees
The standard unit for a measuring the cross-sectional area of a wire is the:
circular mil
The drawing scale is MOST likely to be found in which of the following drawing locations?
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:
20 ft.
When installing heating cables for anti-icing systems, cable patters should be in a:
Serpentine
An auxiliary holding contact (seal-in) on a NEMA starter is indicated by the terminal
marking:
A1 & A2
The neutral bus in a sub panel:
is bonded
The PEAK voltage in a nominal 120/208 VAC system is:
, 208V.
THWN conductors have an outer jacket made of:
nylon
What is shown on a sectional drawing?
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?
no one.
The MAIN purpose of a revision block on an electrical drawing is to:
note any changes to the original drawings
Which of the following is the classified location where combustible vapors are always
present?
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?
32"
Exposed field-routed electrical conduit SHOULD be installed so that it:
is plumb and level
When wiring control push button control circuit, the auxiliary holding contact (seal-in) is
wired with the start button in:
parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against:
corrosion
Which of the following factors is used to control the speed of an induction motor?
Frequency
Electrical hand tools that use a regular 120-volt system MUST be 3-wire grounded
UNLESS the:
tool is double-insulated and is approved by an independent testing facility.
A conductor with 220 mils of insulation would have insulation thickness of:
0.22"
