Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an________________?

Related Mcqs:

1. In the cyclone separator used for separation of dust from dust laden gas, the gas ?

   A. Enters the cyclone from the top
   B. Is admitted tangentially at high velocity
   C. Develops a helical motion inside the chamber
   D. Both B. and C.

2. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?

   A. 200°C and 5 atm
   B. 1000°C and 10 atm
   C. 500°C and 50 atm
   D. 1000°C and 500 atm

3. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?

   A. British standard screens
   B. German standard screens (DIN 1171) etc
   C. American standard screens (ASTM and Tyler standard screens)
   D. All A., B. and C.

4. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?

   A. 0.007
   B. 0.30
   C. 50
   D. 0.014

5. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?

   A. 5
   B. 50
   C. 500
   D. 5000

6. Dust laden air can be purified using a____________________?

   A. Cyclone separator
   B. Bag filter
   C. Gravity settler
   D. Tubular centrifuge

7. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) ?

   A. S
   B. 1/R
   C. 1/μ
   D. All A., B. & C.

8. Which of the following may prove unsuitable for filtering volatile liquids ?

   A. Pressure filter
   B. Gravity filter
   C. Centrifugal filter
   D. Vacuum filter

9. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the__________________?

   A. Venturi atomiser
   B. Gravity settling chamber
   C. Electro-static precipitator
   D. Cyclone separator

10. 200 mesh sieve size corresponds to _____________ microns?

    A. 24
    B. 74
    C. 154
    D. 200