NCCER ELECTRICAL LEVEL 2 MODULE 3 Intro To Light Energy Questions and Answers

NCCER ELECTRICAL LEVEL 2 MODULE 3
Intro To Light Energy
Light energy that is NOT absorbed by an object can be _____. - ANS reflected from
and/or transmitted through the object

A light that is considered warm in tone is produced by lamps with color temperatures of
_____. - ANS 3,000°K




A
The resistance of a tungsten filament is ______. - ANS much higher after the lamp is




VI
turned on

The filament of a tungsten-halogen lamp is encased in a capsule containing iodine or




TU
_____. - ANS bromine gas

During operation, a high-output (HO) fluorescent lamp typically has a current draw of
_____. - ANS 800mA to 1,000mA
IS
The type of high-intensity discharge (HID) lamp that uses the oldest HID technology is
the _____. - ANS mercury vapor lamp
OM

The diameter of a 4', T-12 fluorescent lamp is __. - ANS 1 ½"

To improve both ballast efficiency and lamp efficacy, an electronic ballast typically
operates the connected fluorescent lamps at a frequency of _____. - ANS 20kHz to
NA


50kHz

A driver supplies stable power to a(n) _____. - ANS LED
JP



Most code requirements governing the installation of luminaries, lampholders, and
lamps are covered in _____. - ANS NEC Article 410

Luminaire whips used to connect from a junction box mounted above the ceiling to a
luminaire installed in a suspended ceiling must have a minimum length of ____. - ANS
18" (450 mm)

The maximum luminaire whip lengths when wiring suspended ceiling luminaires is ____.
- ANS 6' (1.8m)