Mechanical Operations problems
- 1. The distribution given by microscopic analysis of powder is
Options- A. number
- B. length
- C. area
- D. volume Discuss
Correct Answer: number
- 2. If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is ?s is defined by
Options- A. ?s = 6 Vp/dp sp
- B. ?s = Vp/dp sp
- C. ?s = 6 dp Sp/Vp
- D. ?s = dp Sp/Vp Discuss
Correct Answer: ?s = 6 Vp/dp sp
- 3. Pick out the wrong statement.
Options- A. Close circuit grinding is more economical than open circuit grinding.
- B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'.
- C. The equipment used for the removal of traces of solids from a liquid is called a classifier.
- D. Size enlargement is a mechanical operation exemplified by medicinal tablet making. Discuss
Correct Answer: The equipment used for the removal of traces of solids from a liquid is called a classifier.
- 4. Which of the following is a pressure filter?
Options- A. Leaf filter (Moore filter).
- B. Plate and flame filter.
- C. Rotary drum filter.
- D. Sand filter. Discuss
Correct Answer: Plate and flame filter.
- 5. The main size reduction operation in ultrafine grinders is
Options- A. cutting
- B. attrition
- C. compression
- D. impact Discuss
Correct Answer: attrition
- 6. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
Options- A. flight
- B. slat or drag
- C. ribbon
- D. screw Discuss
Correct Answer: screw
- 7. Equivalent diameter of a particle is the diameter of the sphere having the same
Options- A. ratio of surface to volume as the actual volume.
- B. ratio of volume to surface as the particle.
- C. volume as the particle.
- D. none of these. Discuss
Correct Answer: ratio of surface to volume as the actual volume.
- 8. Filter aid is used to
Options- A. increase the rate of filtration.
- B. decrease the pressure drop.
- C. increase the porosity of the cake.
- D. act as a support base for the septum. Discuss
Correct Answer: increase the porosity of the cake.
- 9. __________ centrifuge is normally used in sugar mills.
Options- A. Tubular bowl
- B. Disc-bowl
- C. Suspended batch basket
- D. Perforated horizontal basket continuous Discuss
Correct Answer: Suspended batch basket
- 10. Which of the following is not an ultrafine grinder (colloid mill)?
Options- A. Micronizers
- B. Agitated mills and fluid energy mills
- C. Toothed roll crusher
- D. Hammer mills with internal classification Discuss
Correct Answer: Toothed roll crusher
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