Mechanical Operation Book for Chemical Engineering MCQ - Set 09 - ObjectiveBooks

Mechanical Operation Book for Chemical Engineering MCQ - Set 09

Practice Test: Question Set - 09

1. The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively).
    (A) Df/Dp
    (B) Dp/Df
    (C) Df - Dp
    (D) None of these

2. Which of the following screens has the maximum capacity?
    (A) Grizzlies
    (B) Trommels
    (C) Shaking screen
    (D) Vibrating screen

3. Sphericity of pulverized coal is
    (A) 1
    (B) < 1
    (C) > 1

4. For spheres, volume shape factor is given by
    (A) π = (A/D2)
    (B) 2π = (2A/D2)
    (C) π/6 = (V/D3)
    (D) AD/V

5. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
    (A) Drag
    (B) Ribbon
    (C) Screw
    (D) Slat

6. The inlet pressure in a constant rate filtration
    (A) Increases continuously
    (B) Decreases gradually
    (C) Remains constant
    (D) None of these

7. There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
    (A) Classification
    (B) Tabling
    (C) Jigging
    (D) Froth floatation

8. Trommels separate a mixture of particles depending on their
    (A) Size
    (B) Density
    (C) Wettability
    (D) Electrical & magnetic properties

9. Pick out the wrong statement pertaining to the turbine agitator.
    (A) Recommended peripheral speed for the turbine agitator is 200-250 meters/minute
    (B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
    (C) Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)
    (D) Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used

10. Close circuit grinding by a ball mill with air sweeping employs a
    (A) Classifier
    (B) Cyclone separator between mill & classifier
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

11. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge
    (A) Increases
    (B) Decreases
    (C) Remains constant
    (D) Increases linearly

12. Which of the following clay mixing devices is vacuum operated for de-aeration of clay?
    (A) Banbury mixer
    (B) Pug mill
    (C) Muller-mixer
    (D) None of these

13. Which of the following mechanical conveyors does not come under the division ‘scrapers’?
    (A) Ribbon conveyor
    (B) Flight conveyor
    (C) Bucket elevators
    (D) Drag conveyor

14. Pick out the correct statement.
    (A) Angle of repose is always greater than the angle of slide
    (B) A hopper is a small bin with a sloping bottom
    (C) A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal
    (D) Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process

15. Which of the following is the softest material?
    (A) Talc
    (B) Feldspar
    (C) Corundum
    (D) Calcite

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