Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?

Related Mcqs:

1. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________?

   A. Electromagnets
   B. Cams or eccentric shafts
   C. Unbalanced flywheels
   D. Either A., B. or C.

2. 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.

3. 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

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. With increase in the capacity of screens, the screen effectiveness__________________?

   A. Remains unchanged
   B. Increases
   C. Decreases
   D. Decreases exponentially

6. Which of the following screens has the maximum capacity ?

   A. Grizzlies
   B. Trommels
   C. Shaking screen
   D. Vibrating screen

7. Trommels are revolving screens which normally operate in the range of _______________ rpm?

   A. 1 – 2
   B. 15 – 20
   C. 40 – 50
   D. 60 – 75

8. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

   A. 0.01 L.S
   B. 0.087 L.S
   C. L.S
   D. L.S/0.087

9. Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ?

   A. 3.6 V.W.Dr.ρ
   B. 3.6 V.W. ρ
   C. 3.6 W.Dr.ρ
   D. 3.6 V.W.Dr/ρ

10. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?

    A. 3.6 W.D.V.ρ
    B. 3.6 W.D.V
    C. 3.6 W.V.ρ
    D. 3.6 D.V.ρ