A. 0.1 to 1
B. 3 to 6
C. 10 to 15
D. 15 to 20
Related Mcqs:
- Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
A. 10 to 20
B. 100 to 200
C. 1500 to 2500
D. 4000 to 5000 - Insufficient washing of sand grains in a rapid sand filter causes__________________?
A. Air binding
B. Shrinkage of filtering media
C. Mud balls
D. Expansion of filtering media - Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is__________________?
A. Inversely proportional to viscosity of gas
B. Proportional to the viscosity & density of the gas
C. Proportional to the pressure of the gas
D. Both B. and C. - In a sedimentation tank, the detention period for water ranges from _____________ hours?
A. 2 to 4
B. 8 to 12
C. 16 to 20
D. 24 to 32 - A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?
A. 1000 to 2000
B. 3000 to 6000
C. 6000 to 9000
D. 10000 to 100000 - 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) - The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
A. Decreases
B. Increases
C. Remain constant
D. May increase or decrease; depends on the chemical characteristics of polluted water - 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. - For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be__________________?
A. 6738.9
B. 6753.5
C. 7058.3
D. 9000 - Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
A. PvB
B. xB.PvB
C. (Patm – Pvw)xB
D. xB.Patm
