Mechanical Operations in Chemical Process Questions - Set 14 - ObjectiveBooks

Mechanical Operations in Chemical Process Questions - Set 14

Practice Test: Question Set - 14

1. Pick out the wrong statement.
    (A) Hammer crushers operate by impact action
    (B) Standard screens have circular opening
    (C) With increase in mesh number of screens, their diameter in microns decreases
    (D) 200 mesh screen has 200 openings per linear cm

2. Which is a secondary crusher for a hard & tough stone?
    (A) Jaw crusher
    (B) Cone crusher
    (C) Impact crusher
    (D) Toothed roll crusher

3. Dust laden air can be purified using a
    (A) Cyclone separator
    (B) Bag filter
    (C) Gravity settler
    (D) Tubular centrifuge

4. Soft & non-abrasive materials can be made into fines by
    (A) Attrition
    (B) Compression
    (C) Cutting
    (D) None of these

5. For the transportation of ultrafine particles, the equipment used is a __________ conveyor.
    (A) Belt
    (B) Pneumatic
    (C) Screw
    (D) None of these

6. Width and speed of a conveyor belt depends upon the __________ of the material.
    (A) Lump size
    (B) Bulk density
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

7. Coal is finally pulverized to 200 mesh size for burning in boilers by a
    (A) Hammer crusher
    (B) Ball mill
    (C) Roll crusher
    (D) Gyratory crusher

8. Optimum ratio of operating speed to critical speed of a trommel is
    (A) 0.33-0.45
    (B) 1.33-1.45
    (C) 0.5-2
    (D) 1.5-2.5

9. __________ are mixed using ribbon blenders.
    (A) Lumpy solids and low viscosity liquids
    (B) Dry powders
    (C) High viscosity liquids
    (D) Thick pastes

10. The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.
    (A) Same as
    (B) 2.5 times
    (C) 5 times
    (D) 10 times

11. Reduction ratio of crushers is the
    (A) Ratio of feed opening to discharge opening
    (B) Ratio of discharge opening to feed opening
    (C) Determining factor for minimum dia of the feed and the product
    (D) None of these

12. Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
    (A) Filtering
    (B) Washing
    (C) Drying
    (D) All (a), (b) & (c)

13. Which of the following is not a revolving/tumbling mill used for size reduction?
    (A) Compartment mill
    (B) Pebble mill
    (C) Cage mill
    (D) Rod mill

14. The most suitable equipment for the transportation of 200 mesh size particles is a
    (A) Bucket elevator
    (B) Pneumatic conveyor
    (C) Screw conveyor
    (D) Belt conveyor

15. Tank filter (e.g., Nutsche filter) is
    (A) A high pressure filter
    (B) A continuous filter
    (C) Used for small scale filtration work
    (D) A leaf filter

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