Midterm

Question 1

Defined as the sun’s horizontal position angle, measured from the south.

Answer 1

Azimuth Angle

Question 2

Solar position is _________ for any given time and location.

Answer 2

Absolutely predictable

Question 3

Exterior illumination depends upon

Answer 3

> Solar position
Weather condition
Effects of local terrain

Question 4

Cloud cover, unlike solar position, is only _________

Answer 4

Statistically predictable

Question 5

The four basic sky conditions

Answer 5

> Solid overcast sky
Clear sky without sun
Clear sky with sun
Partly cloudy sky

Question 6

Overcast Sky is sometimes called

Answer 6

Commission Internationale de I’Eclairage sky

Question 7

Its has a non-uniform brightness distribution, increasing from horizon to zenith in approximately a 1:3 ratio

Answer 7

Overcast Sky

Question 8

It is the ratio of indoor illuminance to available outdoor illuminance.

Answer 8

Daylight Factor

Question 9

The two source components of Horizontal Illuminance

Answer 9

> Diffuse illumination from the sky

>Direct sunlight

Question 10

It is valued from the sun as a function of solar altitude, when combined with proper portion of diffuse illuminance

Answer 10

Horizontal Illuminance

Question 11

It is important for determining the daylight contribution of vertical, elements in skylights and it is also a major component of interior daylight.

Answer 11

Vertical Surface Illuminance

Question 12

It is defined as the horizontal angle between a vertical plane containing the sun and a plane perpendicular to the vertical surface.

Answer 12

Bearing angle

Question 13

A type of sky that is difficult to express mathematically because of its infinite variability of conditions.

Answer 13

Partly Cloudy Sky

Question 14

The illumination from a partly cloudy sky is higher than of a clear sky by ___ to ___ because of additional reflected sunlight from cloudy edges.

Answer 14

10 to 15 %

Question 15

It is the radiant power at each wavelength or band of wavelength in the visible region

Answer 15

Spectral power distribution

Question 16

it is the physical difference of SPDs that appear to have the same color

Answer 16

Metamers

Question 17

It is a measure of how colors of surface will appear when illuminated by a light source

Answer 17

Color rending index

Question 18

It describes the appearance of light generated by a hot object.

Answer 18

Correlated color temperature

Question 19

It is the other term for color temperature

Answer 19

Chromaticity

Question 20

It is the quality attribute by which we recognize and describe colors.

Answer 20

Hue

Question 21

It is the difference between the resultant colors of the same hue.

Answer 21

Brilliance or Value

Question 22

It is the difference from the purity of the color.

Answer 22

Saturation or Chroma

Question 23

A type of lamp that produces light by heating a filament

Answer 23

Incandescent Lamp

Question 24

A type of lamp that produce light by ionizing gas through electric discharge inside the lamp

Answer 24

Discharge Lamp

Question 25

A type of lamp that uses the phenomenon called electroluminescence to convert electrical energy directly to light

Answer 25

Solid-state Lamp

Question 26

It is the ratio of lumens provided to watts of heat produced by a light source

Answer 26

Efficacy

Question 27

Source with higher efficacy require ____ electrical energy to light a space or area.

Answer 27

Less

Question 28

What are the parts of an incandescent lamp

Answer 28

>Bulb >Filament >Gas >Base

Question 29

Halogen Lamps are sometimes called ______ lamps because its high temperature envelopes instead of the softer glass used.

Answer 29

Quartz lamp

Question 30

A type of lamp that produce light by passing an electric current through a gas that emits light when ionized by current.

Answer 30

Discharge Lamps

Question 31

A type of lamp that uses electric current to heat a coiled tungsten filament to produce light.

Answer 31

Incandescent Lamps

Question 32

It is an auxiliary device that supplies voltage to the lamp's electrodes

Answer 32

Ballast

Question 33

What are the two types of Discharge Lamps

Answer 33

>High-intensity discharge | >Low-intensity discharge

Question 34

What are the four types of high-intensity discharge lamps

Answer 34

> High-pressure mercury vapor > Metal-halide >High-pressure sodium >Xenon

Question 35

A type of lamp that is a gas discharge source that contains mercury vapor at low pressure, with a small amount of inert gas for starting.

Answer 35

Fluorescent Lamp

Question 36

What are the three types of Fluorescent lamps

Answer 36

Linear Fluorescent Lamp Compact Fluorescent Lamp Light-Emitting Diodes