NCCER Electrical 2 Module3

Light impulses are transferred from the eye to the brain by the part of the eye called the ___.

• rods

• cones

• pupil

• optic nerve

Light first enters the eye through a thin, transparent layer called ___.

• retina

• pupil

• cornea

• lens

Which of the following materials absorbs the most light?

• Rough concrete

• Dark red bricks

• Stainless steel

• White paint

When all the wavelengths of light spectrum are presented to the eye in nearly equal proportions, the color of the light is ___.

• red

• white

• blue

• green

Which type of lamp is subject to an explosion if the arc tube ruptures?

• Metal halide lamp

• Tungsten-filament lamp

• LED lamp

• Mercury vapor lamp

Which of the following describes a color temperature of 4100K and higher?

• Warm in tone, enhancing reds and yellows

• Moderate in tone with a balance between warmth and coolness

• Cool in tone with a bias toward blues and green

• Daylight simulating

The type of high-intensity discharge (HID) lamp that has excellent color rendition is the

• low-pressure sodium lamp

• high-pressure sodium lamp

• mercury vapor lamp

• metal halide lamp

Which of the following is TRUE with regard to replacing lamps?

• Replacement lamps are designed for use with all voltage ratings.

• Recessed luminaires that contain lamps of the wrong wattage may cycle on and off.

• Never rotate a bi-pin lamp to seat it in the luminaire.

• Dimmers are designed for use with all replacement lamp types

The LED lighting component that controls the voltage and/or current is called the

• heat sink

• driver

• diode

• controller

Which type of ballast has high system efficiency and excellent lamp life?

• Electronic programmed-start

• Electronic rapid-start

• Electronic instant-start

• Magnetic rapid-start