NCCER TEST 2 Flashcards
In a guardrail system, the guardrails can be made of any of the following EXCEPT:
A. Pipe
B. Chain
C. Ropebanding
D. Cable
Ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the circuit is :
A. 4.8 ohms
B.9.6 ohms
C. 48 ohms
D. 96 ohms
9.6 ohms
A UL listed rod type grounding electrode must have e a MINIMUM length of :
A. 6 “
B. 8 “
C. 10 “
D. 20 “
8 “
What is the MNIMIUM number of overload sensing units required for all three phase motors?
A) 0
B) 1
C) 2
D) 3
3
In a circuit of pure capacitance, the current leads the voltage by an angle of:
A. 30 degrees
B. 45 degrees
C. 90 degrees
D. 180 degrees
90 degrees
The standard unit for measuring the cross-sectional area of wire is the :
A. Circular mil.
B. Square mil.
C. Round mil.
D. Radial mil.
Circular mil.
The drawing scale is MOST likely to be found in which of the following drawing locations?
A. The lighting fixture schedule
B. The symbol list
C. The drawing title block
D. The power riser diagram
The drawing title block
The length of bare copper conductor is a ground ring MUST be buried no less than 2.5’ below grade and with a length of at least:
A. 10ft
B. 20ft
C. 25ft
D. 50ft
20ft
When installing heating cables for anti-icing systems, cable pattern should be in a :
A. Cris-cross
B. Vertical zig-zag
C. Circular
D. Serpentine
Serpentine
An auxiliary holding contact (seal-in) on a NEMATODE starter is indicated by the terminal marking:
A. 13 & 14
B. 2 & 3
C. T1 & T2
D. A1 & A2
A1 & A2
The Neutral bus in a sub panel:
A. Is boded
B. Is isolated
C. Has its own ground rod
D. Terminates bare and neutral wires
Is bonded
The PEAK voltage in a nominal 120/208 VAC system is:
A. 120V
B. 170V
C. 208 V
D. 277V
208 V
THWN conductors have an outer jacket made of :
A. Thermoset
B. Teflon
C. Nylon
D. Nomex
Nylon
What is shown on a sectional drawing?
A. Cutaway view of a building
B. Top view of a building
C. Front view of a building
D. Side view of a building
Cutaway view of a building
Who is allowed to remove another electrician’s tag or lock from any valve, switch, or of equipment without proper authorization?
A. An inspector
B. No one
C. Any supervisor
D. Owner
No one
The MAIN purpose of a revision block on an electrical drawing is to:
A. Note any changes to the original drawings
B. Identify the professional engineer
C. Indicate the location of the project
D. Provide a title for the drawing
Note any changes to the original drawings
Which of the following is the classified location where combustible vapors are always present?
A. Class 1, Div 1
B. Class 2, Div 2
C. Class 2, Div 1
D. Class 3, Div 1
Class 1 Div 1
With a row 3-4” conduits and second row of 3-2” and 2-1” conduits for a angle pull box what is the minimum distance between the opposite walls of the pull box ?
A. 18”
B. 32”
C. 40”
D.48”
32”
Exposed field-routed electrical conduit SHOULD be installed so that it:
A. Is plumb and level
B. Does not come in contact with structural beams
C. Always goes over the top of product pipes
D. Only uses 3 point saddles to cross product pipes
The plumb and level
When wiring a 3-wire control push button control circuit, the auxiliary holding contact ( seal-in) is wired with teh start button in:
A. Series
B. Parallel
C. Internal
D. External
Parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against:
A. Sunlight
B. Corrosion
C. Expansion
D. Heat
Corrosion
Which of the following factors is used to control the speed of an induction motor?
A. Voltage
B. Current
C. Frequency
D. Load
Frequency
Electrical he and tools that use a regular 120-volt system MUST be 3-wire grounded UNLESS the:
A. Worker wears rubber gloves
B. Worker wears rubber gloves and stands on a rubber mat
C. Tool is double-insulated and is approved by an independent testing facility
D. Tool has a non-lockable “dead mans” trigger switch
Tool is double insulated and is approved by an independent testing facility
A conductor with 220 mils of insulation would have insulation thickeners of :
A. 0.22
B. 2.2
C. 22
D. 220
0.22
What is the purpose of sealing cable ends that are in storage?
A. To keep moisture from entering in
B. To indicate the cable has been tested
C. To prevent chemical decomposition
D. To prevent insulation breakdown
To keep moisture from entering in
Which one of the fuses is standard size according to the NEC?
A. 2
B. 3
C. 4
D. 5
3
