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- Question
Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called
Options- A. classification
- B. sedimentation
- C. clarification
- D. decantation
- Correct Answer
- sedimentation
- 1. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.
Options- A. plane
- B. curved
- C. ribbed
- D. either (a) or (b) Discuss
- 2. The main differentiation factor between tube mill and ball mill is the
Options- A. length to diameter ratio.
- B. size of the grinding media.
- C. final product size.
- D. operating speed. Discuss
- 3. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.
Options- A. thickener
- B. classifier
- C. strainer
- D. clarifier Discuss
- 4. Use of grinding aids results in the
Options- A. enhanced production rate.
- B. finer products.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 5. 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.
Options- A. same as
- B. 2.5 times
- C. 5 times
- D. 10 times Discuss
- 6. The optimum moisture content in solids to be crushed/ground ranges from __________ percent.
Options- A. 3 to 4
- B. 8 to 10
- C. 10 to 15
- D. 15 to 20 Discuss
- 7. Pick out the correct statement.
Options- A. The capacity and the effectiveness of a screen are the same.
- B. The capacity and the effectiveness of screen are opposing factors.
- C. The screening surface of a 'reel' (a revolving screen used in flour mills) is made of silk bolting cloth supported by wire mesh.
- D. both (b) and (c). Discuss
- 8. In classification, particles are said to be equal settling, if they have the same terminal velocities in the
Options- A. different fluids
- B. same fluid
- C. same field of force
- D. both (b) and (c) Discuss
- 9. Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the
Options- A. elimination of solvent drying facility.
- B. higher nitration temperature.
- C. lower solvent dilution ratio.
- D. all (a), (b) & (c). Discuss
- 10. Feedstock for the production of biodiesel is
Options- A. herbal plants
- B. used vegetable oils
- C. LSHS
- D. bagasse Discuss
Mechanical Operations problems
Search Results
Correct Answer: ribbed
Correct Answer: length to diameter ratio.
Correct Answer: strainer
Correct Answer: neither (a) nor (b).
Correct Answer: 2.5 times
Correct Answer: 3 to 4
Correct Answer: both (b) and (c).
Correct Answer: both (b) and (c)
Correct Answer: all (a), (b) & (c).
Correct Answer: used vegetable oils
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