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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