Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?

Related Mcqs:

1. Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr?

   A. 0.1 to 1
   B. 3 to 6
   C. 10 to 15
   D. 15 to 20

2. 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

3. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be _____________ litres?

   A. 448
   B. 224
   C. 22.4
   D. Data insufficient; can’t be computed

4. 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.

5. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?

   A. 5
   B. 10
   C. 15
   D. 20

6. 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

7. Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?

   A. 580
   B. 640
   C. 1160
   D. Data insufficient; can’t be computed

8. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be _______________ atmosphere?

   A. 0.5
   B. 1
   C. 1.5
   D. 2

9. 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)

10. 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