Receptacles
Which of the following is the most common voltage rating for a single-phase residential electrical outlet in the United States?
A. 120V
B. 208V
C. 240V
D. 480V
A. 120V
The building entry points of underground ducts or conduits must be:
A. sealed
B. unsealed
C. grounded
D. ungrounded
A. sealed
Which reading should have the highest voltage when a receptacle is wired correctly?
A. Hot to ground
B. Hot to neutral
C. Neutral to ground
D. They will be the same
A. Hot to ground
Which of these wire sizes is the largest?
A. 2/0 AWG
B. 0 AWG
C. 2 AWG
D. 14 AWG
A. 2/0 AWG
Which of the following is not permitted above steps in a stairway?
A. Receptacles
B. Panelboards
C. Light Switches
D. Junction Boxes
B. Panelboards
All 15 or 20 A receptacles installed in bathrooms must require:
A. water proof receptacles
B. Ground fault circuit interceptor (GFCI)
C. plastic covers
D. Non ground receptacles
B. Ground fault circuit interceptor (GFCI)
What is the limit for the number of bends in a conduit run between pull points?
A. 90 degrees
B. 270 degrees
C. 360 degrees
D. 180 degrees
C. 360 degrees
Measuring neutral to ground is called:
A. Current
B. Voltage
C. Resistance
D. Voltage drop
D. Voltage drop, aka intermediate resistance (IR) drop
When two different size conductor wires are connected in series, the maximum fuse rating that should be used is one that protects:
A. smallest size wire
B. largest size wire
C. the average of the two wires
D. wire size does not affect the fuse rating
A. smallest size wire
In a panel, a two-pole circuit breaker is considered:
A. Two over current devices
B. A single over current device
C. Four over current devices
D. Not an overcurrent device
A. Two over current devices, because a two-pole circuit breaker has two terminals for incoming power lines and two lines for outgoing power lines.
Grounding type receptacles shall be used on which of the following branch circuits:
A. 20 A
B. 15 A
C. Neither 15 A or 20 A
D. Both 15 A and 20 A
D. Both 15 A and 20 A
What would be the take up for a 90 degree bend for a 3/4" conduit?
A. 5"
B. 6"
C. 8"
D. It depends on the wire being used
B. 6"
On long runs it may be necessary to do what to compensate for voltage drop?
A. use EMT instead of PVC
B. increase the branch-circuits conductors size
C. install a voltage booster in the circuit
D. convert a plug connection to a hard-wire connection
B. increase the branch-circuits conductors size
Where can non-metallic (type NM) cable be used?
A. Battery rooms
B. In elevators or escalators
C. As a service entrance cable
D. In homes
D. In homes
If a panel is supplied by a transformer, where must the over current device be located on the transformer?
A. the cooling tubes
B. in the control cabinet
C. secondary side
D. primary side
C. secondary side
According to the National Electrical Code (NEC), which type of outlet is required in most unfinished basements and garages?
A. Standard 15A outlet
B. GFCI outlet (due to potential moisture exposure)
C. Tamper-resistant outlet
D. Weatherproof outlet
B. GFCI outlet (due to potential moisture exposure)
When pulling conductors through conduit, what is the MAXIMUM recommended fill percentage according to the National Electrical Code (NEC)?
A. 25%
B. 40%
C. 50%
D. 75%
B. 40%
Power factor is calculated as:
A. apparent power divided by true power
B. apparent power divided by voltage
C. apparent power divided by current
D. true power divided by apparent power
D. true power divided by apparent power
Where should Type AC (armor-clad) cable NOT be used?
A. Branch circuits for exposed work
B. Dry Location
C. Cable Trays
D. Wet Location
D. Wet Location - because they do not have a PVC waterproof jacket
The maximum breaker size that can be used for a 12 AWG Copper wire is:
A. 30A
B. 25A
C. 20A
D. 15A
C. 20A
What's the difference between a ground fault circuit interrupter (GFCI) and an arc fault circuit interrupter (AFCI)?
A. GFCI prevents electrical shock whereas AFCI prevents fires
B. AFCI prevents electrical shock whereas GFCI prevents fires
C. Both are designed to prevent fires and electrical shock
D. Neither prevent fires or electrical shock
A. GFCI prevents electrical shock whereas AFCI prevents fires
Metal raceways installed horizontally must be supported at each end and at least how many feet?
A. 1 ft.
B. 2 ft.
C. 5 ft.
D. 10 ft.
C. 5 ft.
A cord and plug device used as disconnecting means for a motor must be rated for:
A. Current
B. Resistance
C. Voltage
D. Horsepower
D. Horsepower
Which wire would you NOT use in a wet location?
A. TW Solid Copper
B. THHW Stranded Copper
C. THHN Stranded Copper
D. XHHW Stranded Aluminum
T = Thermoplastic
X = Cross-Linked Polyethylene (XLPE)
H = Heat Resistant
HH = High Heat Resistance
N = Nylon Coated
W = Water Resistance
Which of the following must be provided for a wire 4 AWG or larger entering a panelboard?
A. A bonding jumper
B. A grounding clip
C. An insulated bushing
D. An insulated grounding conductor
C. An insulated bushing