Mechanical Operations - Chemical Engineering MCQ - Set 29

Practice Test: Question Set - 29

1. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
    (A) Feed material
    (B) Type of crushing machine
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)
2. 200 mesh sieve size corresponds to __________ microns.
    (A) 24
    (B) 74
    (C) 154
    (D) 200
3. __________ mean diameter of particles is given by Σ (xi/Dpi⃗ )
    (A) Mass
    (B) Volume
    (C) Arithmetic
    (D) Volume surface
4. Which of the following mineral dressing operations is termed as 'comminution'?
    (A) Panning
    (B) Spiralling
    (C) Tabling
    (D) None of these
5. Horsepower required for a roll crusher is directly proportional to its
    (A) Reduction ratio
    (B) Capacity
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)
6. Which of the following is not an industrial screening equipment?
    (A) Sharpies centrifuge
    (B) Vibrating screen
    (C) Grizzly
    (D) Trommel
7. Weber number is significant and is concerned with the
    (A) Solid-liquid mixing
    (B) Liquid-liquid mixing
    (C) Dispersion of liquid in liquid
    (D) Suspension of solid in liquid
8. Highly viscous liquids & pastes are agitated by
    (A) Propellers
    (B) Turbine agitators
    (C) Multiple blade paddles
    (D) None of these
9. The unit of specific cake resistance is
    (A) gm/cm2
    (B) cm/gm
    (C) cm/gm2
    (D) gm/gm
10. Supporting legs of a plate and frame filter is normally made of
    (A) Stainless steel
    (B) Cast iron
    (C) High speed steel
    (D) Wooden plank
11. Colloidal mills are used for __________ grinding.
    (A) Coarse
    (B) Intermediate
    (C) Fine
    (D) Ultrafine
12. Tabular bowl centrifuges as compared to disk bowl centrifuges
    (A) Operate at higher speed
    (B) Employ bowl of larger diameter
    (C) Can’t be operated under pressure/vacuum
    (D) Can’t be used for separation of fine suspended solids from a liquid
13. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
    (A) Parabola
    (B) Straight line
    (C) Hyperbola
    (D) Exponential curve
14. What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
    (A) 16°
    (B) 32°
    (C) 40°
    (D) 46°
15. 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)
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