assessment 2 - dd Flashcards
possible MCQ
a lamp has a required colour temperature of 2000K, what illumination colour is this
range from red, orange, white and blue
warm red illumination
1500 - 2500 lux
colour
red - orange
3000 lux
colour
yellow
3500 - 5000 lux
colour
white
5000 - 8500 lux
colour
blue
daylight
9000 lux
position
top
top of scale - limit
lamps increase with CRI, what CRI value might you specify for an office environment
number of luxes
80 lux
desired illumination for a plant room containing M&E equipment in an office block
number of luxes
150 lux
illumination measured in lux
desired design illumination for an open plan office where technical drawing boards are in use
number of luxes
500 lux
desired design illumination for an open plan office containing a small filling room
number of luxes
300 lux
in acoustics the sound pressure wave is measured in
units
hertz
in acoustics what are the three processes that occur when a sound pressure hits a solid wall
3 steps
reflection / absorption / transmission
mass law
definition
increased mass = improved ability to block sound SRI
transmission loss
0 - 100
100mm thick plastered brick wall has SRI of 45dB it is replaced by 220mm, what is the new SRI value
50dB
nothings perfect
double the mass increase sound dB by 6 units
a single glazed window 4mm glass will typically have an SRI of
dB
22dB
0 - 50
4mm glass single glazed window is replaced with a double glazed unit having 2 x 4mm glass layer with air inside.
what is the new SRI value
39dB
can’t be 22 as that’s for a single glazed window, it can’t be exactly double cause the rule is you add 6. so with the pockets of air it’s 39.
20*C in K
293K
+273 *C to K
a lecture theatre sits 60 students after being empty all morning, 60 students walk in at 13:00, what will happen to the carbon dioxide and moisture levels after 30 minutes?
up or down
CO2 and mositure levels rise
after an hour if all the sutdents left the carbon dioxide levels would drop, rooms are leaky, fresh outisde air would get in, ventillation systems for rooms without windows
high CO2 levels make students sleepy 1000 - they fall alseep
0 - 50
an acceptable wintertime air temperature in an office is
in degrees C
22*C
25*C - summer office temperature
16*C - gym, weights, cycle - low temperature, bigger heat transfer from skin to cooler air
