Mechanical Operations problems
- 1. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ? = bulk density of material, kg/m3)
Options- A. 3.6 W.D.V.?
- B. 3.6 W.D.V.
- C. 3.6 W.V.?
- D. 3.6 D.V.? Discuss
Correct Answer: 3.6 W.D.V.?
- 2. Energy consumption in a crusher decreases with increase in the
Options- A. size of the product (at constant feed size).
- B. capacity of the crushing machine.
- C. size of feed (at constant reduction ratio).
- D. all (a), (b) & (c). Discuss
Correct Answer: all (a), (b) & (c).
- 3. Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the
Options- A. Blake jaw crusher
- B. cage mill
- C. stamp mill
- D. Bradford's breaker Discuss
Correct Answer: cage mill
- 4. The term 'angle of nip' is concerned with the operation of the __________ crushers.
Options- A. jaw
- B. roll
- C. gyratory
- D. none of these Discuss
Correct Answer: roll
- 5. Vacuum filter is most suitable for the
Options- A. removal of fines from liquid.
- B. liquids having high vapour pressure.
- C. liquids of very high viscosity.
- D. none of these. Discuss
Correct Answer: none of these.
- 6. __________ mill is normally used for grinding of talc.
Options- A. Tube
- B. Compartment
- C. Ring-roll
- D. Pebble Discuss
Correct Answer: Ring-roll
- 7. Sauter mean diameter is the same as the __________ mean diameter.
Options- A. mass
- B. arithmetic
- C. volume-surface
- D. geometric Discuss
Correct Answer: volume-surface
- 8. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
Options- A. 20
- B. 12
- C. 8
- D. 2 Discuss
Correct Answer: 2
- 9. Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
Options- A. viscosity
- B. thermal conductivity
- C. surface tension
- D. density Discuss
Correct Answer: density
- 10. Which of the following is not a cutting machine?
Options- A. Dicers
- B. Knife cutters
- C. Slitters
- D. Tube mills Discuss
Correct Answer: Tube mills
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