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- Question
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.
- Correct Answer
- ratio of surface to volume as the actual volume.
- 1. 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
- 2. The main size reduction operation in ultrafine grinders is
Options- A. cutting
- B. attrition
- C. compression
- D. impact Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. __________ centrifuge is normally used in sugar mills.
Options- A. Tubular bowl
- B. Disc-bowl
- C. Suspended batch basket
- D. Perforated horizontal basket continuous Discuss
- 8. 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
- 9. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
Options- A. resins
- B. gums
- C. hard rubber
- D. waxes Discuss
- 10. For a non-spherical particle, the sphericity
Options- A. is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
- B. has the dimension of length.
- C. is always less than 1.
- D. is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle. Discuss
Mechanical Operations problems
Search Results
Correct Answer: screw
Correct Answer: attrition
Correct Answer: Plate and flame filter.
Correct Answer: The equipment used for the removal of traces of solids from a liquid is called a classifier.
Correct Answer: ?s = 6 Vp/dp sp
Correct Answer: increase the porosity of the cake.
Correct Answer: Suspended batch basket
Correct Answer: Toothed roll crusher
Correct Answer: hard rubber
Correct Answer: is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
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