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- Question
__________ centrifuge is normally used in sugar mills.
Options- A. Tubular bowl
- B. Disc-bowl
- C. Suspended batch basket
- D. Perforated horizontal basket continuous
- Correct Answer
- Suspended batch basket
- 1. 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
- 2. 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
- 3. 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
- 4. The main size reduction operation in ultrafine grinders is
Options- A. cutting
- B. attrition
- C. compression
- D. impact Discuss
- 5. 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
- 6. 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
- 7. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
Options- A. resins
- B. gums
- C. hard rubber
- D. waxes Discuss
- 8. 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
- 9. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
Options- A. bronze
- B. stainless steel
- C. flint or porcelain
- D. concrete Discuss
- 10. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the
Options- A. square root of the velocity.
- B. square of the viscosity.
- C. filtration time only.
- D. washing time only. Discuss
Mechanical Operations problems
Search Results
Correct Answer: increase the porosity of the cake.
Correct Answer: ratio of surface to volume as the actual volume.
Correct Answer: screw
Correct Answer: attrition
Correct Answer: Plate and flame filter.
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.
Correct Answer: flint or porcelain
Correct Answer: square root of the velocity.
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