NEC Practice Questions |
1/9/2004 |
By Mike Holt
Article 90 Introduction
16a. In order for equipment
and materials to receive approval _____. (a) the equipment and material must
be listed by UL (b) the authority having jurisdiction must decide on
approval (c) the authority having jurisdiction can never approve non-listed
items (d) the local electrical distributor must decide on approval
Chapter 1 General
Article 110 Requirements for Electrical
Installations
118a. Unused cable or raceway opening in electrical
equipment shall be_____. (a) filled with cable clamps or connectors
only (b) taped over with electrical tape (c) repaired by weldng or brazing
in a metal slug (d) effectively closed by fittings that provide protection
equivalent to the wall of the equipment
120a. For mounting electrical
equipment on a masonry wall, it is acceptable to drill a hole in the masonry and
drive a wooden plug into the hole, then use sheet rock screws drilled into the
wooden plug. (a) True (b) False
126a. The termination provisions of
equipment for circuits rated 100 amperes or less or marked for 14 AWG through 1
AWG conductors shall be used only for conductors rated _____ or conductors with
higher temperature ratings provided their ampacity is determined based on the
____ ampacity of the conductor size used unless the equipment is listed or
identified for use with higher temperature rated conductors. (a) 60 degrees C
(b) 75 degrees C (c) 30 degrees C (d) 90 degrees C
127a. The termination
provisions of equipment for circuits rated over 100 amperes or marked for
conductors larger than 1 AWG, shall be used only for conductors rated _____ or
conductors with higher temperature ratings provided their ampacity is determined
based on the ____ ampacity of the conductor size used unless the equipment is
listed or identified for use with higher temperature rated conductors. (a) 60
degrees C (b) 75 degrees C (c) 30 degrees C (d) 90 degrees C
128a. The
identification of the high leg (wild leg) of a 3 phase 4 wire delta connected
system shall be done using _____. (a) red in color or colored red by an
effective means (b) orange in color or colored orange by an effective
means (c) permanent lettering on the conductor installed by the manufacturer
of the wire (d) this is no longer required
128b. Identification of the
high leg of a 3 phase 4 wire delta connected system shall be required
_____. (a) at the service disconnect only (b) at each point on the system
where a connection is made if the equipment grounding conductor is also
present (c) at each point on the system where a connection is made if the
grounding electrode conductor is also present (d) at each point on the system
where a connection is made if the grounded conductor is also
present
128c. Switchboards, panelboards industrial control panels,
and motor control centers that are in other than dwelling occupancies and are
likely to require examination, adjustment, servicing, or maintenance while _____
shall be field marked to warn qualified persons of potential electric arc flash
hazards. (a) being installed (b) energized (c) de-energized (d) in fault
condition
128d. The manufacturer's name, trademark, or other descriptive
marking shall be placed on all electric equipment. Where required by the Code,
markings such as voltage, current, wattage, or other ratings shall be provided
with sufficient durability to withstand _____. (a) the voltages encountered
(b) painting and other finishes applied (c) the environment involved. (d)
Lack of planning by the installer
128e. All installed disconnecting means
shall be legibly marked to indicate their purpose unless they are located and
arranged so _____. (a) that they can be locked out and tagged (b) they
are not readily accessible (c) their purpose is evident (d) that they
operate at less than 300 volts to ground
141a. For equipment rated 1,200A
or more and having a width of over 6 ft, at least one entrance, measuring not
less than 24 in. wide and 61/2 ft high, shall be provided at each end of the
working space. Where the entrance to the working space has a door, the
door_____. (a) shall open either in or out with simple pressure and shall not
have any lock (b) shall open out and be equipped with panic hardware or other
devices so the door can open under simple pressure without the use of
hands. (c) shall be removed (d) shall be equipped with an electronic
opener
142a. Illumination shall be provided for all working spaces about
service equipment, switchboards, panelboards, and motor control centers
_____. (a) over 600 volts (b) located indoors (c) rated 1200 amps or more
(d) using automatic means of control Chapter 2 Wiring and
Protection Article 200 Use and Identification of Grounded
Conductors
172a. The means of identification of _____ to which a grounded
conductor is to be connected shall be substantially white in color. (a)
wirenuts (b) circuit breakers (c) terminals (d) ground rods
173a. The
screw shell of a luminaire or lampholder shall be connected to the _____ (a)
grounded (neutral) conductor (b) ungrounded conductor (c) equipment grounding
conductor (d) forming shell terminal Article 210 Branch Circuits
174a.
The rating of a branch circuit is determined by the rating of the_____. (a)
ampacity of the largest device connected to the circuit (b) average of the
ampacity of all devices (c) branch-circuit overcurrent protection
device (d) ampacity of the branch circuit conductors according to table
310.16
195a. Two or more ____, 1Ø, 120V small-appliance branch circuits
shall be provided to supply power for 15A or 20A receptacle outlets in the
dwelling unit kitchen, dining room, breakfast room, pantry, or similar dining
areas. (a) 15 amp (b) 20 amp (c) 30 amp (d) either 15 or 20 amp
211a.
Receptacle outlets installed for a specific appliance, such as a clothes washer,
dryer, range, or refrigerator, shall be within _____ of the intended location of
the appliance. (a) sight (b) 6 feet (c) 3 feet (d) readily accessible, no
maximum distance
211b. In a dwelling unit, the minimum required
receptacle outlets shall be in addition to receptacle outlets that are _____.
(a) part of a luminaire or appliance (b) located within cabinets or
cupboards (c) more than 51/2 ft above the floor (d) all of these
217a.
A receptacle connected to the small-appliance branch circuit can be used to
supply an electric clock. (a) True (b) False
217b. A receptacle
connected to the small-appliance circuit can supply gas-fired ranges, ovens, or
counter-mounted cooking units. (a) True (b) False
217c. Receptacles
installed in a kitchen to serve countertop surfaces shall be supplied by not
fewer than _____small-appliance branch circuits. (a) one (b) two (c) three
(d) no minimum
239a. Lighting outlets can be controlled by occupancy
sensors equipped with a _____ that will allow the sensor to function as a wall
switch. (a) manual override (b) photo cell (c) GFCI device (d) Selenium
Controlled Rectifier (SCR)
Article 215 Feeders
250a. On a
_____system where the midpoint of one phase winding is grounded, the conductor
having the higher voltage-to-ground shall be identified by an outer finish that
is orange in color, or by other effective means. Such identification shall be
placed at each point where a connection is made if the grounded conductor is
also present. (a) single phase 3 wire (b) 3 phase, 4-wire
delta-connected (c) 3 phase 4 wire wye-connected (d) 3 phase 3 wire
delta-connected
NEC Practice Questions Answer Key
Article 90
Introduction
16a. (b) 90.4
Chapter 1 General
Article 110
Requirements for Electrical Installations
118a. (d) 110.12(a) 120a.
(a) 110.13(a) 126a. (a) 110.14(c)(1)(a) 127a. (b) 110.14(C)(1)(b) 128a.
(b) 110.15 128b. (d) 110.15 128c. (b) 110.16 128d. (c) 110.21 128e.
(c) 110.22 141a. (b) 110.26(C)(2) 142a. (b) 110.26(D)
Chapter 2
Wiring and Protection
Article 200 Use and Identification of Grounded
Conductors
172a. (c) 200.9 173a. (a) 200.10(c) Article 210 Branch
Circuits 174a. (c) 210.3 195a. (b) 210.11(C)(1) 211a. (b)
210.50(C) 211b. (d) 210.52 217a. (a) 210.52(B)(2) Exc 1 217b. (a)
210.52(B)(2) Exc 2 217c. (b) 210.52(B)(3) 232a. (a) 210.60 239a. (a)
210.70(A)(1) Ex. 2
Article 215 Feeders
250a. (b) 215.8
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