Mechanical Operations Chemical Engineering Objective Questions & Answers - ObjectiveBooks

Mechanical Operations Chemical Engineering Objective Questions & Answers

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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