5-200 μm size particles are called__________________?
5-200 μm size particles are called__________________?
A. Colloids or aerosols
B. Powder
C. Dust
D. Smoke
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In water treatment, alum [Al2(SO4)3] is used for the process of __________________?
In water treatment, alum [Al2(SO4)3] is used for the process of __________________?A. Filtration
B. Coagulation
C. Sedimentation
D. Disinfection______________ is the process of killing organism in water ?
______________ is the process of killing organism in water ?A. Coagulation
B. Sterilisation
C. Disinfection
D. SedimentationMaximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?A. 50
B. 1000
C. 2000
D. 5000World environment day is observed every year on the 5th of___________________?
World environment day is observed every year on the 5th of___________________?A. June
B. December
C. July
D. SeptemberScale formation in boiler is controlled by____________________?
Scale formation in boiler is controlled by____________________?A. Preheating of feed water
B. Reduction in hardness, silica & alumina in feed water
C. Keeg the pH value of feed water just below 7
D. Eliminating H2S in feed waterHigh noise levels produced during operation of fans and compressors can be reduced by using__________________?
High noise levels produced during operation of fans and compressors can be reduced by using__________________?A. Mufflers (silencers)
B. Acoustic absorbent
C. Lagging of noisy duct
D. None of these