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- Question
Which of the following minerals is not subjected to magnetic separation method?
Options- A. Rutile
- B. Galena
- C. Chromite
- D. Siderite
- Correct Answer
- Galena
- 1. The process opposite to 'dispersion' is termed as the
Options- A. flocculation
- B. sedimentation
- C. filtration
- D. none of these. Discuss
- 2. Maximum size reduction in a fluid energy mill is achieved by
Options- A. compression
- B. interparticle attrition
- C. cutting
- D. impact Discuss
- 3. Trommels are revolving screens which normally operate in the range of __________ rpm.
Options- A. 1 - 2
- B. 15 - 20
- C. 40 - 50
- D. 60 - 75 Discuss
- 4. A screen is said to be blinded, when the
Options- A. oversizes are present in undersize fraction.
- B. undersizes are retained in oversize fraction.
- C. screen is plugged with solid particles.
- D. screen capacity is abruptly increased. Discuss
- 5. rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)
Options- A.
- B.
- C.
- D. 76.75 D Discuss
- 6. Wheat is ground into flour in a
Options- A. hammer crusher
- B. roller crusher
- C. impact mill
- D. fluid energy mill Discuss
- 7. To produce talcum powder, use
Options- A. ball mill
- B. hammer mill
- C. jet mill
- D. pin mill Discuss
- 8. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called
Options- A. classification
- B. froth floatation
- C. thickening
- D. clarification Discuss
- 9. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.
Options- A. primary
- B. secondary
- C. fine
- D. ultrafine Discuss
- 10. Filtration should be stopped in a filter press, if the
Options- A. cake becomes very dense.
- B. liquor stops flowing out to the discharge.
- C. filtration pressure rises suddenly.
- D. both(b)&(c). Discuss
Mechanical Operations problems
Search Results
Correct Answer: flocculation
Correct Answer: interparticle attrition
Correct Answer: 15 - 20
Correct Answer: screen is plugged with solid particles.
Correct Answer:
Correct Answer: roller crusher
Correct Answer: ball mill
Correct Answer: classification
Correct Answer: secondary
Correct Answer: both(b)&(c).
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