Chemical Engineering Operations Practice Test - Set 20 - ObjectiveBooks

Chemical Engineering Operations Practice Test - Set 20

Practice Test: Question Set - 20


1. To remove dirt from the flowing fluid, we use a
    (A) Coagulant
    (B) Gravity settler
    (C) Strains
    (D) Clarifier

2. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
    (A) Bronze
    (B) Stainless steel
    (C) Flint or porcelain
    (D) Concrete

3. The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a
    (A) Boundary mixer
    (B) Propeller agitator
    (C) Sharpies centrifuge
    (D) None of these

4. The mechanism of size reduction by a hammer mill is by impact and attrition between the
    (A) Grinding element & the housing
    (B) Feed particles
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

5. Which of the following may prove unsuitable for filtering volatile liquids?
    (A) Pressure filter
    (B) Gravity filter
    (C) Centrifugal filter
    (D) Vacuum filter

6. Solid particles separation based on the difference in their flow velocities through fluids is termed as the
    (A) Clarification
    (B) Classification
    (C) Elutriation
    (D) Sedimentation

7. A screen is said to be blinded, when the
    (A) Over-sizes are present in undersize fraction
    (B) Under-sizes are retained in oversize fraction
    (C) Screen is plugged with solid particles
    (D) Screen capacity is abruptly increased

8. Size reduction mechanism used in Jaw crushers is
    (A) Attrition
    (B) Compression
    (C) Cutting
    (D) Impact

9. Wet grinding in a revolving mill __________ as compared to dry grinding.
    (A) Gives less wear on chamber walls
    (B) Requires more energy
    (C) Increases capacity
    (D) Complicates handling of the product

10. Wet sieving is employed, when the product contains __________ materials.
    (A) Abrasive
    (B) Large quantity of very fine
    (C) Coarse
    (D) Non-sticky

11. Which of the following is not a part of the Blake jaw crusher?
    (A) Hanger
    (B) Check plates
    (C) Toggles
    (D) Pitman

12. According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than
    (A) 0.00184
    (B) 0.0184
    (C) 0.184
    (D) 1.84

13. Float and sink test determines the possibility of cleaning of coal by a process based on the
    (A) Gravity separation
    (B) Wettability
    (C) Particle shape
    (D) None of these

14. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?
    (A) 0.5
    (B) 1.0
    (C) 2.76
    (D) 0.66

15. Cumulative analysis for determining surface is more precise than differential analysis, because of the
    (A) Assumption that all particles in a single fraction are equal in size
    (B) Fact that screening is more effective
    (C) Assumption that all particles in a single fraction are equal in size, is not needed
    (D) None of these

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