Mechanical Operations problems
- 1. Which of the following minerals is not subjected to magnetic separation method?
Options- A. Rutile
- B. Galena
- C. Chromite
- D. Siderite Discuss
Correct Answer: Galena
- 2. Wheat is ground into flour in a
Options- A. hammer crusher
- B. roller crusher
- C. impact mill
- D. fluid energy mill Discuss
Correct Answer: roller crusher
- 3. To produce talcum powder, use
Options- A. ball mill
- B. hammer mill
- C. jet mill
- D. pin mill Discuss
Correct Answer: ball mill
- 4. 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
Correct Answer: classification
- 5. 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
Correct Answer: secondary
- 6. 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
Correct Answer: both(b)&(c).
- 7. A gravity decanter is meant for the separation of two __________ density.
Options- A. immiscible liquids of different
- B. miscible liquids of different
- C. immiscible liquids of same
- D. miscible liquids of same Discuss
Correct Answer: immiscible liquids of different
- 8. The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).
Options- A. D2p
- B. Dp
- C. 1/Dp
- D. 1/D2p Discuss
Correct Answer: 1/Dp
- 9. Pick out the correct statement.
Options- A. Angle of repose is always greater than the angle of slide.
- B. A hopper is a small bin with a sloping bottom.
- C. A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal.
- D. Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process. Discuss
Correct Answer: A hopper is a small bin with a sloping bottom.
- 10. Pick out the wrong statement:
Options- A. Magnetic separation method can be employed to treat both dry & wet ores.
- B. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size.
- C. Gyratory crusher is used for coarse crushing.
- D. Screens are of stationary, moving and vibratory types. Discuss
Correct Answer: Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size.
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