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- Question
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
- Correct Answer
- 1/Dp
- 1. 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
- 2. 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
- 3. 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
- 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
- 5. To produce talcum powder, use
Options- A. ball mill
- B. hammer mill
- C. jet mill
- D. pin mill Discuss
- 6. 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
- 7. 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
- 8. During agitation of liquids, the
Options- A. Froude number is independent for the curves between power number and Reynolds number in baffled system.
- B. Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller.
- C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number.
- D. all (a), (b) and (c). Discuss
- 9. Pick out the wrong statement.
Options- A. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant.
- B. Cake resistance is independent of the pressure drop.
- C. Crushing of explosive materials are done by employing drygrinding.
- D. Gyratory crusher is a coarse crusher. Discuss
- 10. In closed circuit grinding as compared to open circuit grinding, the
Options- A. specific surface of product is more.
- B. product has lesser size uniformity.
- C. production rate at a given limiting size is lower.
- D. operation is economical. Discuss
Mechanical Operations problems
Search Results
Correct Answer: immiscible liquids of different
Correct Answer: both(b)&(c).
Correct Answer: secondary
Correct Answer: classification
Correct Answer: ball mill
Correct Answer: A hopper is a small bin with a sloping bottom.
Correct Answer: Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size.
Correct Answer: all (a), (b) and (c).
Correct Answer: Cake resistance is independent of the pressure drop.
Correct Answer: operation is economical.
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