Deck 14: Lighting

Question 1

Mirrored glass reflects 99 percent of the light that strikes it.

Answer 1

False

Question 2

What unit of measurement is used to measure the amount of illumination on a surface?

A) lumen
B) candlepower
C) watt
D) foot-candle

Answer 2

D

Question 3

A(n) ____, highly polished, bright material reflects most of the light that strikes it.

A) translucent
B) colored
C) thin
D) opaque

Answer 3

D

Question 4

A light intensity curve can be used to show that the amount of illumination is independent of the angle from the source.

Question 5

A glow switch is also called a(n) ____.

A) preheat
B) energy saver
C) heater
D) starter

Question 6

____ lighting fixtures transmit 60 percent to 90 percent of the light upward.

A) Indirect
B) Semi-direct
C) Semi-indirect
D) General diffusing

Question 7

Which law is used to calculate the intensity of light at a given distance from a source?

A) square law
B) inverse square law
C) proportional law
D) spherical law

Question 8

The most common type of electric discharge lamp is the ____ lamp.

A) incandescent
B) high energy discharge
C) fluorescent
D) commercial

Question 9

What is the approximate percentage of light reflected by a black colored surface?

A) 3 percent
B) 10 percent
C) 50 percent
D) 80 percent

Question 10

A luminaire is  _____.

A) a complete lighting unit
B) a method of lighting
C) the power source for a lighting unit
D) the lamp portion of a lighting unit

Question 11

Candlepower and lumens are units of measurement of light emitted from a source.

Question 12

When considering multiple light sources, the amount of illumination at a given point is the sum of the light rays coming from all the units.

Question 13

The ratio between the light that reaches the working plane and the light produced by the luminaire provides a constant known as the ____ .

A) coefficient of utilization
B) efficiency
C) maintenance constant
D) usage coefficient

Question 14

When lighting is so bright that it causes eye discomfort, it is said to produce ____.

A) vapor
B) glare
C) intensity
D) absorbed light

Question 15

One type of luminaire is indirect.