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- Question
The reduction ratio for fine grinders is
Options- A. 5-10
- B. 10-20
- C. 20-40
- D. as high as 100
- Correct Answer
- as high as 100
- 1. 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
- 2. __________ 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
- 3. 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
- 4. To get a fine talc powder from its granules, the equipment used is
Options- A. roller crusher
- B. ball mill
- C. jaw crusher
- D. gyratory crusher Discuss
- 5. Separation of materials of the same density based on their sizes by using then-different rates of flow is called
Options- A. sorting
- B. sizing
- C. flocculation
- D. elutriation Discuss
- 6. All resistances during washing of cake
Options- A. increases
- B. decreases
- C. remain constant
- D. none of these Discuss
- 7. 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
- 8. 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
- 9. __________ mills are termed as impactors.
Options- A. Hammer
- B. Cage
- C. Rolling-compression
- D. none of these Discuss
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: incompressible cake and laminar
Correct Answer: Flight
Correct Answer: have greater capacity per unit of discharge area.
Correct Answer: ball mill
Correct Answer: sizing
Correct Answer: remain constant
Correct Answer: silicates & phosphates
Correct Answer: increases
Correct Answer: Hammer
Correct Answer: all (a), (b) and (c).
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