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- Question
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for
Options- A. British standard screens.
- B. German standard screens (DIN 1171) etc.
- C. American standard screens (ASTM and Tyler standard screens).
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. __________ mills are termed as impactors.
Options- A. Hammer
- B. Cage
- C. Rolling-compression
- D. none of these Discuss
- 2. Temperature of the product during ultrafine grinding
Options- A. increases
- B. decreases
- C. remains constant
- D. may increase or decrease ; depends on the material being ground Discuss
- 3. Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are
Options- A. carbonates
- B. sulphates
- C. silicates & phosphates
- D. bi-carbonates Discuss
- 4. All resistances during washing of cake
Options- A. increases
- B. decreases
- C. remain constant
- D. none of these Discuss
- 5. The reduction ratio for fine grinders is
Options- A. 5-10
- B. 10-20
- C. 20-40
- D. as high as 100 Discuss
- 6. Size measurement of ultrafine particles can be best expressed in terms of
Options- A. centimetre
- B. screen size
- C. micron
- D. surface area per unit mass Discuss
- 7. Which is a secondary crusher for a hard & tough stone?
Options- A. Jaw crusher
- B. Cone crusher
- C. Impact crusher
- D. Toothed roll crusher Discuss
- 8. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
Options- A. 0.5 D
- B. D
- C. 1.5 D
- D. 2 D Discuss
- 9. A __________ mixer resembles a ball mill without balls.
Options- A. banbery
- B. pug mill
- C. tumbling
- D. pan Discuss
- 10. Tank filter (e.g., Nutsch filter) is
Options- A. a high pressure filter.
- B. a continuous filter.
- C. used for small scale filtration work.
- D. a leaf filter. Discuss
Mechanical Operations problems
Search Results
Correct Answer: Hammer
Correct Answer: increases
Correct Answer: silicates & phosphates
Correct Answer: remain constant
Correct Answer: as high as 100
Correct Answer: surface area per unit mass
Correct Answer: Cone crusher
Correct Answer: D
Correct Answer: tumbling
Correct Answer: used for small scale filtration work.
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