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.
A. June
B. December
C. July
D. September
A. Alum
B. Bleaching powder
C. Activated carbon
D. Copper sulphate
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
A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these
A. Undesirable plants growth
B. Depletion of oxygen
C. Fire hazards
D. Explosion hazards
A. Cancer
B. Asthma
C. Silicosis
D. Fluorosis (bone disease)