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WorksheetsDaylight Introduction
Total questions: 25
Worksheet time: 10mins
The WWR ratio that is not suited for a building located in a hot arid climate
1:4
1:2
1:6
1:1
The absolute minimum value when calculating day light distribution necessary for performing an intended activity in a room to be taken as a thumb rule is
20% of the floor area X Daylight factor (DF)
80% of the floor area X Daylight factor (DF)
80% exceeded value of Daylight factor (DF)
20% exceeded value of Daylight factor (DF)
The most reliable USABLE DAYLIGHT COMPONENT for tropical and sub-tropical climates
Direct Sunlight
Reflected Light
Light from diffuse sky
Diffusely reflected light
In all Lighting scenarios r+a+t is
Less than 1
equal to 1
exceeding 1
zero
Density of light falling on a surface is
Luminous Intensity
Luminous Flux
Illuminance
Luminous efficacy
Luminous efficacy is expressed in
Lumens/m2
Lumens/W
candela/m2
candela/W
If the Luminous efficacy of a luminaire is in the range of 50-70 the type of luminaire can be
LED
Fluorescent lamp
CFL
Halogen lamp
The formula for Daylight factor is
DF = (Ei / Eo) x 100%
DF = (Eo / Ei) x 100%
DF = (Eo / 100) x Ei%
DF = (Ei / 100) x Eo%
The day lighting performance of a building is influenced primarily by
The internal room reflectance and materials used (Ei)
WWR ratio
areas and geometry of the building
ground reflectance (Eo)
If 40% of the sky is obstructed by dense vegetative cover at site level which has a reflectance factor of 30%, the externally reflected light that can be procured is
0.12XSC
1.2XSC
12XSC
0.7XSC
Calculate the illuminance at a point in a Living Room of 3.5x3.5m dimension, if the external illuminance is 6000 lux.
1500Lux
150Lux
60Lux
30Lux
For rooms which are symmetrically single side-lit we suggest that a characteristic reference point be taken
4/5 of the total room depth
2/5 of the total room depth
15/30 of the total room depth
2/3 of the total room depth
Daylight Autonomy is the percentage of annual daytime hours that at a given point in space is above a specified illumination level.
the percentage of annual daytime hours that at a given point in space is above a specified illumination level
the percentage of annual daytime hours that at a given point in space is at a specified illumination level
the percentage of total direct daylight hours from the sun directly
the percentage of total daylight hours from an aperture (SC) annually
The values for Autonomous UDI is
less than 300 lux
More than 3000 lux
between 300-3000 lux
less than 100 lux
Which of the parameter need not be considered while the selection of material that is to be used for glazing over a top- lighting source?
Visual Transmittance
Solar Heat gain co-efficient
Construction technology of the material
WWR Ratio
A passive top lighting strategy for temperate climates that uses direct sunlight, in spaces where occupants briefly move in about a space e.g.: A Lobby
Light Well
Light Scoop
Clere-story
Sky Light
The crucial factor that influences on determining the maximum building height that can be proposed with reference to an adjacent existing building is
Sky condition
Sky exposure angle
Sunshine probability
Skyline – Scale ratio
Glare is caused due to
Excessive luminance
Excessive lighting contrast in the field of vision
Either A or B
Only A
Incase of a singly lit room, which has a window height of 1.2m and the depth of the room 5M, the reference point to be taken for the calculation of daylight distribution, in case of 80% exceeded Daylight Factor (DF) criteria is
4M
3M
2M
1.2M
Lighting Power density (LPD) is measured in ------------ unit?
(a)
Utilization factor doesnot depend on
Room Reflectance
Room shape
color surface of walls and ceiling
Numbers of hours the lamp is put to use
Utilization factor varies from ---------- in direct lighting
0.15-0.35
0.5-0.7
0.4-0.6
0.35-0.6
Maintenance factor (MF) is
Illuminance at the end of maintenance period to initial illuminance
Illuminance at the start of maintenance period to initial illuminance
Illuminance at the start of maintenance period to maximum illuminance
Illuminance at the end of maintenance period to maximum illuminance
The illumination of a surface receiving the luminous flux from a point source is inversely proportional to the square of the distance between the surface and the source. Which law states this?
(a)
Depreciation factor of a luminaire is the inverse of
Maintenance factor
Utilization factor
Absorption factor
Reflection factor
