A. Preheating of feed water
B. Reduction in hardness, silica & alumina in feed water
C. Keeping the pH value of feed water just below 7
D. Eliminating H2S in feed water
Related Mcqs:
- Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?
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 - Deaeration of high pressure boiler feed water is done to reduce ___________________?
A. Foaming from boilers
B. Its dissolved oxygen content
C. Its silica content
D. Caustic embrittlement - Soluble silica present in boiler feed water can be removed by______________________?
A. Coagulation
B. Filtration
C. Anion exchanger
D. Preheating it - Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water?
A. Turbidity
B. Color (Hazen)
C. Total solids
D. All A., B. & C. - Which of the following is the most detrimental for water used in high pressure boiler ?
A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen - Tri-sodium phosphate is used in boiler water treatment to reduce____________________?
A. Turbidity
B. Caustic embrittlement
C. Suspended silica
D. Dissolved oxygen - High noise level in a chemical plant can be controlled by the_________________?
A. Suppression of noise at the source itself
B. Path control of noise
C. Protection of operating personnel
D. All A., B. & C. - The biological decomposition of organic substances in wastes controlled conditions is called_________________?
A. Incineration
B. Biological oxidation
C. Composting
D. None of these - CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?
A. 102
B. 105
C. 109
D. 1015 - The function of skimming tank in sewage treatment is to remove _____________ substances?
A. Dissolved solid
B. Suspended solid
C. Oil & fatty
D. Gritty & inorganic
