Test Yourself with Electrical Questions!
1. What is the MAXIMUM allowable cord length for the cord supplying a cord-and-plug-connected dishwasher installed under a kitchen counter in a dwelling unit?
a. 11⁄2 feet
b. 2 feet
c. 3 feet
d. 4 feet
2. What is the MINIMUM size copper SE cable with type THHW insulation that may be used as ungrounded, service-entrance phase conductors for a 150 ampere-rated, 120/240 volt, single-phase residential service?
a. 1/0 AWG
b. 1 AWG
c. 2 AWG
d. 3 AWG
3. For outlet boxes designed to support ceiling-suspended (paddle) fans that weigh more than _____ pounds, the required marking shall include the maximum weight to be supported.
a. 20
b. 30
c. 35
d. 70
4. A connection to a driven or buried grounding electrode shall ______.
a. be accessible
b. not be required to be accessible
c. not be permitted to be buried
d. be visible
5. What is the MAXIMUM allowable standard circuit breaker rating that may be used with a size 8 AWG, copper, NM-B cable supplying an electric range?
a. 30 amperes
b. 40 amperes
c. 50 amperes
d. 60 amperes
6. The MAXIMUM number of size 10 AWG conductors permitted in a 4 inch x 11⁄4 inch octagon metal junction box is _____.
a. 2
b. 4
c. 5
d. 6
7. Determine the MINIMUM number of 15 ampere, 120 volt, lighting branch circuits required for a dwelling that has 2,600 square feet of habitable space.
a. 3
b. 4
c. 5
d. 6
8. When calculating the total load on a dwelling unit, how many VA per square feet must be included for the general-purpose receptacle outlets?
a. 0
b. 1
c. 2
d. 3
9. When calculating the total load for a dwelling unit, what is the MINIMUM load, in VA, that must be added for the two (2), required, small-appliance branch circuits?
a. 1,200 VA
c. 2,400 VA
b. 1,500 VA
d. 3,000 VA
10. It shall be permissible to apply a demand factor of _____ percent to the nameplate rating load of four (4) or more fastened-in-place electric water heaters in a multi-family dwelling unit.
a. 50
b. 75
c. 80
d. 90
11. In dwelling units, at least one (1) wall receptacle shall be installed in bathrooms; the receptacle outlet shall be within at LEAST _____ of the outside edge of each basin.
a. 12 inches
b. 18 inches
c. 24 inches
d. 36 inches
12. When installing NM cable through bored holes in wooden studs, the holes shall be bored so that the edge of the hole is not less than _____ from the edge, or the cable shall be protected by a steel plate at least 1⁄16 inch thick.
a. 3⁄4 inch
b. 1 inch
c. 11⁄4 inches
d. 11⁄2 inches
13. A 240 volt, single-phase, 30 ampere-rated, electric clothes dryer will have a VA rating of _____.
a. 5,000
b. 7,200
c. 8,000
d. 15,400
14. Type XHHW insulated conductors are permitted to be used in _____.
a. dry locations only
b. wet locations only
c. dry or damp locations only
d. dry, damp or wet locations
15. When two (2) single-pole switches are mounted on the same strap, the number of conductors permitted in the box shall be reduced by _____ conductor(s).
a. 1
b. 2
c. 3
d. 4
16. When doing residential service and feeder calculations, electric clothes dryers are to be calculated at a MINIMUM of _____ watts (VA) or the nameplate rating, whichever is larger.
a. 3,000
b. 4,500
c. 5,000
d. 6,000
17. The rating of any single cord-and-plug-connected appliance used on a 30 ampere-rated branch circuit shall not exceed _____.
a. 30 amperes
b. 27 amperes
c. 24 amperes
d. 16 amperes
18. In general, all receptacles installed on 15 and 20 ampere, 120 volt branch circuits are required to _____.
a. be GFCI protected
b. have a nonmetallic faceplate
c. be of the ungrounded type
d. be of the grounding type
19. A branch circuit supplying a 5 kW wall-mounted oven and a 7 kW counter-mounted cook-top in a residence has a demand factor of _____ on the ungrounded service-entrance conductors.
a. 12.0 kW
b. 9.5 kW
c. 8.0 kW
d. 7.8 kW
20. The MINIMUM size copper equipment grounding conductor required to equipment served by a 40 ampere-rated branch circuit is _____.
a. 10 AWG
b. 8 AWG
c. 12 AWG
d. 14 AWG
21. What is the MAXIMUM allowable voltage between conductors on a branch circuit supplying luminaires in a residence?
a. 120 volts
b. 150 volts
c. 240 volts
d. 250 volts
22. The ampacity of the branch-circuit conductors to a residential, central-heating electric furnace shall NOT be less than _____ percent of the furnace load.
a. 80
b. 100
c. 115
d. 125
23. Switches and circuit breakers used as a disconnecting means to appliances shall be _____.
a. factory installed only
b. of the fusible type
c. of the indicating type
d. of the tripping type
24. The NEC requires recessed portions of fixture enclosures that are not identified for contact with insulation to be spaced from combustible material a MINIMUM of _____.
a. 3⁄8 inch
b. 1⁄2 inch
c. 3⁄4 inch
d. 1 inch
25. When installing luminaires (lighting fixtures) without GFCI protection above an indoor spa or hot tub, they are required to be mounted at LEAST _____ above the maximum water level of the spa or hot tub.
a. 5 feet
b. 7 feet 6 inches
c. 6 feet 7 inches
d. 12 feet