A. 20
B. 60
C. 90
D. 120
A. Insufficient supply of combustion air and insufficient time for combustion
B. Poor quality of fuel and improper mixing of fuel & combustion air
C. Poor design & overloading of furnace
D. All A., B. and C.
Smoke is produced due to__________________? Read More »
Chemical Environmental Engineering A. June
B. December
C. July
D. September
World environment day is observed every year on the 5th of___________________? Read More »
Chemical Environmental Engineering A. Alum
B. Bleaching powder
C. Activated carbon
D. Copper sulphate
Foul odour and bad taste of water is removed by treating with__________________? Read More »
Chemical Environmental Engineering B. Cooling and freezing of water kills the bacteria present in it
C. With increasing boiler operating pressure of steam, the maximum allowable concentration of
silica in feed water goes on decreasing
D. Dissolved oxygen content in high pressure boiler feed water should be nil
A. Dental cavities
B. Scale formation
C. Water-borne disease
D. Corrosion
A. 0.001
B. 0.1
C. 1
D. 5
TLV of mercury in potable (drinking) water is about ______________ ppm? Read More »
Chemical Environmental Engineering A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these
Presence of iron and manganese in water causes___________________? Read More »
Chemical Environmental Engineering A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazards
Presence of soluble organics in polluted water causes_________________? Read More »
Chemical Environmental Engineering A. Cancer
B. Asthma
C. Silicosis
D. Fluorosis (bone disease)
