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semester 2 IEC year 1 Questions and Answers Rated A+
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semester 2 IEC year 1
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semester 2 IEC year 1E.
5 - answer By U.L. Standard 153, portable light tracks must have a cord not less than
___ feet in length.
A.
4
B.
6
C.
3
D.
8
E.
5
A.
True - answerOne, two, or three circuit lighting track is available.
A.
True
B.
False
D.
receptacle outlets - answerInstructions for most dimmers state that they should not be
used to control ___.
A.
incandescent lighting
B.
track lighting
C.
valence lighting
D.
receptacle outlets
A.
True - answerElectronic dimmers are used in some installations.
A.
True
B.
False
,C.
16.7 - answerThe maximum current-carrying capacity of a 2,000 watt, 120-volt dimmer
is ___ amps.
A.
13.3
B.
20
C.
16.7
D.
none of these
B.
VA - answerDimmers that can be used to control inductive loads such as low-voltage
lighting transformers are rated in ___.
A.
W
B.
VA
A.
I only - answerThe ___ supplied to the connected load increases when batteries are
connected in series.I. voltage II. current
A.
I only
B.
II only
C.
both I & II
D.
neither I nor II
C.
1,500
20 x 75 W = 1500 W = 1500 W dimmer - answerA room is to be illuminated with track
lighting. Twenty track heads (fixtures) will be installed in the track. A 75 W PAR38 lamp
will be installed in each head. The lighting is to be controlled by a dimmer. The smallest
dimmer that can be installed has a rating of ___ watts.
A.
600
B.
1,000
C.
,1,500
20 x 75 W = 1500 W = 1500 W dimmer
D.
2,000
A.
Two - answer___-circuit lighting track will have five metal strips running the length of the
track. Three metal strips will be on one side of the track for connection to one or two
circuit neutrals and the ground. Two metal strips will be on the opposite side of the track
for connection to the two circuit "hot" or ungrounded conductors.
A.
Two
B.
Three
B.
is not - answerLighting track ___ permitted to be installed within a zone extending 3 feet
(900 mm) horizontally and 8 feet (2.5 m) vertically from the top of the bathtub rim.
A.
is
B.
is not
C.
either I or II - answerEach 10' section of lighting track is rated for 20 amps at 125 volts.
The circuit supplying this track can be connected to a ___-amp, single-pole breaker in a
120/240-volt, 1Ø, 3-wire panel.I. 15 II. 20
A.
I only
B.
II only
C.
either I or II
D.
neither I nor II
A.
5 feet (1.5 m) - answerTrack lighting is not permitted to be installed less than ___ above
the floor unless it has an open-circuit voltage of less that 30 volts RMS.
A.
5 feet (1.5 m)
B.
6 feet (1.8 m)
C.
, 6 feet 7 inches (2.0 m)
D.
7.5 feet (2.3 m)
A.
4 - answerIf more than 4 feet of track is needed, at least one additional support must be
installed for every extension of ___ feet or less.
A.
4
B.
2
C.
6
D.
8
E.
3
D.
all of these - answerLighting track shall be grounded in accordance with Article 250, and
the track sections shall be securely coupled to maintain continuity of the ___
throughout.
A.
circuitry
B.
polarization
C.
grounding
D.
all of these
E.
none of these
C.
both a and b - answerAn ___ dimmer is a type used in some installations.
A.
autotransformer
B.
electronic
C.
both a and b
D.
neither a nor b
E.
8.33 - answerA 120-volt, 1,000 watt dimmer is rated to carry a maximum of ___ amps.
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