environment Flashcards
chloride available in bleaching powder
33 %
free residual chlorine in
- drinking water
- swiming pool water
- drinking water to kill cyclops
- > = 0.5 mg/l
- > = 1
- > =3
horrocks app used for?
chlorine demand estimation
chlorine demand estimation by horrocks app formula
n x 2 gm bleaching powder needed for 455 l
n is no of cups to show color change
chloroscope for ?
free chlorine level
water softening done if
hardness >150 mg/l or >3 meq/l
best indicator for water quality
e coli
fecal strep in water indicates
recent contaminatin
clostridum perfrengins in water indicates
remote cont
kata thermometer used for
low air velocity
sling psychrometer used for
air humidity levels`
air changes / hr in
- living room
- crowded room
2-3
4-6``
max ps4r(predictable 4 hr sweat rate)
<4.5l/ 4h
min illumination for satisfactory vision
15 - 20 ft candle
day light factor in living room and kitchen should be
> =8 %
>=10%
