A. Foaming from boilers
B. Its dissolved oxygen content
C. Its silica content
D. Caustic embrittlement
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 - Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
A. Ozone and iodine
B. Chlorine or its compounds
C. Ultraviolet light for irradiation of water
D. All A., B. & C. - 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 - The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS) - Disinfection of water is done to remove ______________________?
A. Color
B. Bad taste
C. Foul odour
D. Bacteria - Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?
A. Coagulation and flocculation of colloids
B. Oxidation of carbonaceous matter to CO2
C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
to the nitrite and eventually to the nitrate
D. All A., B. and C. - Color test of water is done with an instrument called__________________?
A. Tintometer
B. Colorimeter
C. Electro-chemical cell
D. Turbidimeter
