assessment 2 - dd

Question 1

a lamp has a required colour temperature of 2000K, what illumination colour is this

range from red, orange, white and blue

Answer 1

warm red illumination

Question 2

1500 - 2500 lux

colour

Answer 2

red - orange

Question 3

3000 lux

colour

Answer 3

yellow

Question 4

3500 - 5000 lux

colour

Answer 4

white

Question 5

5000 - 8500 lux

colour

Answer 5

blue

daylight

Question 6

9000 lux

position

Answer 6

top

top of scale - limit

Question 7

lamps increase with CRI, what CRI value might you specify for an office environment

number of luxes

Answer 7

80 lux

Question 8

desired illumination for a plant room containing M&E equipment in an office block

number of luxes

Answer 8

150 lux

illumination measured in lux

Question 9

desired design illumination for an open plan office where technical drawing boards are in use

number of luxes

Answer 9

500 lux

Question 10

desired design illumination for an open plan office containing a small filling room

number of luxes

Answer 10

300 lux

Question 11

in acoustics the sound pressure wave is measured in

units

Answer 11

hertz

Question 12

in acoustics what are the three processes that occur when a sound pressure hits a solid wall

3 steps

Answer 12

reflection / absorption / transmission

Question 13

mass law

definition

Answer 13

increased mass = improved ability to block sound SRI
transmission loss

Question 14

0 - 100

100mm thick plastered brick wall has SRI of 45dB it is replaced by 220mm, what is the new SRI value

Answer 14

50dB

nothings perfect

double the mass increase sound dB by 6 units

Question 15

a single glazed window 4mm glass will typically have an SRI of

dB

Answer 15

22dB

Question 16

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

Answer 16

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.

Question 17

20*C in K

Answer 17

293K

+273 *C to K

Question 18

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

Answer 18

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

Question 19

0 - 50

an acceptable wintertime air temperature in an office is

in degrees C

Answer 19

22*C

25*C - summer office temperature

16*C - gym, weights, cycle - low temperature, bigger heat transfer from skin to cooler air