Practice Test: Question Set - 30
1. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
- (A) Resins
- (B) Gums
- (C) Hard rubber
- (D) Waxes
2. The study on washability of coal is done by using the __________ technique.
- (A) Tabling
- (B) Elutriation
- (C) Heavy media separation
- (D) None of these
3. If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
- (A) Linear speed of the basket is doubled
- (B) Linear speed of the basket is halved
- (C) Centrifugal force is doubled
- (D) Capacity of centrifuge is increased
4. __________ is used for producing a thick suspension from a thin slurry.
- (A) Cartridge filter
- (B) Rotary drum vacuum filter
- (C) Pressure filter thickener
- (D) Plate and frame filter press
5. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
- (A) 0.01 to 0.1
- (B) 0.1 to 0.3
- (C) 0.2 to 0.8
- (D) 0.2 to 0.4
6. The speed of a rotary drum vacuum filter may be about __________ rpm.
- (A) 1
- (B) 50
- (C) 100
- (D) 500
7. __________ Centrifuge is normally used in sugar mills.
- (A) Tubular bowl
- (B) Disc-bowl
- (C) Suspended batch basket
- (D) Perforated horizontal basket continuous
8. Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size.
- (A) 0.2 to 0.8
- (B) 5 to 25
- (C) 50 to 100
- (D) 100 to 250
9. Pick out the wrong statement pertaining to the roll crushers.
- (A) Maximum feed size determines the required roll diameter
- (B) For hard material's crushing, the reduction ratio should not exceed 4
- (C) Both the rolls run necessarily at the same speed
- (D) Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced
10. __________ mills are termed as disintegrators.
- (A) Cage
- (B) Compartment
- (C) Pebble
- (D) All tumbling
11. Vertical transportation of materials can be done by a/an
- (A) Apron conveyor
- (B) Pneumatic conveyor
- (C) Bucket elevator
- (D) Both (b) & (c)
12. The term 'angle of nip' is concerned with the operation of the __________ crushers.
- (A) Jaw
- (B) Roll
- (C) Gyratory
- (D) None of these
13. The capacity of a pneumatic conveying system depends upon the
- (A) Bulk density of materials
- (B) Pressure of the conveying air
- (C) Diameter of the conveying line
- (D) All (a), (b) and (c)
14. Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately?
- (A) Rittinger's law
- (B) Kick's law
- (C) Bond's law
- (D) None of these
15. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
- (A) Check plates
- (B) Jaw plates
- (C) Toggles
- (D) Crush shaft
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