Chemical Engineering Basic Mechanical Operation Questions - Set 11 - ObjectiveBooks

Chemical Engineering Basic Mechanical Operation Questions - Set 11

Practice Test: Question Set - 11

1. Pick out the material having minimum Rittinger's number.
    (A) Calcite
    (B) Pyrite
    (C) Quartz
    (D) Galena

2. Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
    (A) 0.5
    (B) 1
    (C) √2
    (D) √3

3. About 2-3 hp, power per gallon of a thin liquid provides vigorous agitation in an agitator. 'Power number' in agitation is given by
    (A) P. gc/n3. D2. ρ
    (B) P. gc. ρ/µ2
    (C) n3. D3. ρ/P. gc
    (D) P. gc/n2. D2. ρ

4. Gelatinous solid (which plug the septum) can be filtered by a __________ filter.
    (A) Sparkler
    (B) Plate and frame
    (C) Vacuum leaf
    (D) Pre-coat

5. A filter press is
    (A) A batch filter
    (B) Not suitable, if the liquid is the main product
    (C) Having prohibitively high maintenance cost
    (D) Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

6. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.
    (A) Flight
    (B) Screw
    (C) Drag
    (D) Belt

7. The crushed material received for separation is called feed or
    (A) Tailing
    (B) Heading
    (C) Concentrate
    (D) Middling

8. Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their
    (A) Particle sizes
    (B) Densities
    (C) Terminal velocities
    (D) None of these

9. __________ mill is not a revolving mill.
    (A) Pebble
    (B) Compartment
    (C) Cage
    (D) Tube

10. __________ conveyors are also called scrapers.
    (A) Apron
    (B) Screw
    (C) Helical flight
    (D) Both (b) & (c)

11. Which of the following equations is Rittinger's crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅sa & D̅sb = volume surface mean diameter of feed & product respectively.)
    (A) P/m = K/ √Dp
    (B) P/m = K . ln D̅sa/D̅sb
    (C) P/m = K . (1/ D̅sb - 1/D̅sa)
    (D) None of these

12. Fibrous material is broken by a
    (A) Roll-crusher
    (B) Squirrel-cage disintegrator
    (C) Ball mill
    (D) Tube mill

13. For coarse reduction of hard solids, use
    (A) Impact
    (B) Attrition
    (C) Compression
    (D) Cutting

14. Work index is defined as the
    (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
    (B) Energy needed to crush one tonne of feed to 200 microns
    (C) Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
    (D) Energy needed to crush one ton of feed to 100 microns

15. __________ mills are termed as impactors.
    (A) Hammer
    (B) Cage
    (C) Rolling-compression
    (D) None of these

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