Formula

Question 1

Foot candles [LUX]= Lumens / Area in square feet

Answer 1

Lumen per lamp x lamps per fixture x number of fixtures x Cu c LLF divided by area in square feet

Cu: coefficient of utilization between 0 and 1 (what is lost from geometry)
When we say we have a coefficient of utilization %90 it means we lost %10 of the efficiency

LLF: light loss factor
The light we lose due to dust or lumen depreciation
90% LLF
We lost 10% of the light

Question 2

Daylight factor: 0.2 x area of window divided by floor area

Question 3

Watt

Answer 3

Watt = Amper X Volt X power factor

Question 4

Sabin

Answer 4

Sound Absorption units
When we say the Sabin of a room is 700
It means we have the entire room 100% reflective but 700 of this room absorb 100%

Question 5

Cfm

Answer 5

CFM = Fpm (per minute) x the cross sectional area

Question 6

Ration of the sunshade depth to the height of a window

Answer 6

1.5

Question 7

I candela is

Answer 7

that 1 candela equals 12.57 lumens. 12.57 lumens times 3 equals 37.7 lumens

Question 8

An architect is designing a series of townhouses in a hot humid climate with heavy precipitation. The architect needs to detail the exterior wall in a way that keeps moisture out of the wall.
Which of the following should be included in the detail?

Answer 8

Pressure-equalized rainscreen
Correct. In a hot, rainy, and humid climate, a method to control moisture is to use a pressure-equalized rainscreen. The rainscreen assembly includes a ventilated cavity that prevents moisture from getting into the wall. It is suitable for all climates, but especially ones with high levels of precipitation.
Vapor retarder paints on interior side of the envelope
Incorrect. In hot, humid climates it is desirable to prevent the moisture from getting inside.
Outside, the air is usually warmer and more humid. When moisture gets inside, it should be allowed to wick to the interior, which is not possible when using plastic films, vinyl wallpaper, or vapor retarder paints on the interior side. Mold and mildew problems may occur.

Question 9

Under drainage

Answer 9

Like perforated tiles that are very expensive and prone to failure.
We usually do not use this type of drainage unless it is required by percolation test.

Question 10

Learn about db formula

Question 11

A board foot is:
How much is the price of a 1.25” thick and 4.5” width in 8’ long trim in board foot?

Answer 11

A 12” square piece of wood that is 1” thick!!
Calculate the volume of the trim (width x thickness x length) then divide it by (12” x 12” x 1”)

Question 12

What gives the concrete a highly pattern finish?

Answer 12

Corrugated metal
And
Board formed