Mechanical Operations problems
- 1. During the washing of cake
Options- A. all the resistances are constant.
- B. filter medium resistance increases.
- C. filter medium resistance decreases.
- D. cake resistance decreases. Discuss
Correct Answer: all the resistances are constant.
- 2. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
Options- A. density separation.
- B. differential wettability.
- C. size.
- D. volatile matter content. Discuss
Correct Answer: density separation.
- 3. A fluid energy mill is used for
Options- A. cutting
- B. grinding
- C. ultragrinding
- D. crushing Discuss
Correct Answer: ultragrinding
- 4. Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an
Options- A. air filter
- B. bag filter
- C. venturi scrubber
- D. hydrocyclones Discuss
Correct Answer: air filter
- 5. In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.
Options- A. secondary
- B. fine
- C. primary
- D. ultrafine Discuss
Correct Answer: primary
- 6. Separation of solid particles based on their densities is called
Options- A. sizing
- B. sorting
- C. clarification
- D. dispersion Discuss
Correct Answer: sorting
- 7. Soft & non-abrasive materials can be made into fines by
Options- A. attrition
- B. compression
- C. cutting
- D. none of these Discuss
Correct Answer: attrition
- 8. The specific cake resistance for incompressible sludges is (where ?P = pressure drop over cake)
Options- A. ? ?P
- B. ? 1/ ?P
- C. ? ?P
- D. independent of ?P Discuss
Correct Answer: independent of ?P
- 9. Paddle agitator
Options- A. is suitable for mixing low viscosity liquids.
- B. produces axial flow.
- C. moves at very high speed.
- D. none of these. Discuss
Correct Answer: is suitable for mixing low viscosity liquids.
- 10. Which of the following is a coarse crusher?
Options- A. Smooth roll crusher
- B. Toothed roll crusher
- C. Gyratory crusher
- D. Tube mill Discuss
Correct Answer: Gyratory crusher
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