Discussion
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- Question
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
- Correct Answer
- silicates & phosphates
- 1. All resistances during washing of cake
Options- A. increases
- B. decreases
- C. remain constant
- D. none of these Discuss
- 2. The reduction ratio for fine grinders is
Options- A. 5-10
- B. 10-20
- C. 20-40
- D. as high as 100 Discuss
- 3. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.
Options- A. compressible cakes and laminar
- B. incompressible cake and laminar
- C. compressible cake and turbulent
- D. incompressible cake and turbulent Discuss
- 4. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.
Options- A. Flight
- B. Screw
- C. Drag
- D. Belt Discuss
- 5. Gyratory crushers compared to the reciprocating jaw crushers
Options- A. have greater capacity per unit of discharge area.
- B. crush intermittantly.
- C. are less suitable for coarse materials.
- D. have less steady power consumption. Discuss
- 6. 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
- 7. __________ mills are termed as impactors.
Options- A. Hammer
- B. Cage
- C. Rolling-compression
- D. none of these Discuss
- 8. 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). Discuss
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: remain constant
Correct Answer: as high as 100
Correct Answer: incompressible cake and laminar
Correct Answer: Flight
Correct Answer: have greater capacity per unit of discharge area.
Correct Answer: increases
Correct Answer: Hammer
Correct Answer: all (a), (b) and (c).
Correct Answer: surface area per unit mass
Correct Answer: Cone crusher
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