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- Question
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.
- Correct Answer
- Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 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
- 6. 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
- 7. 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
- 8. 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
- 9. Pick out the wrong statement.
Options- A. More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one.
- B. There are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ.
- C. Cutting machines mainly employ 'attrition' for size reduction of solids.
- D. Operating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers. Discuss
- 10. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
Options- A. vacuum
- B. sand
- C. plate & frame
- D. rotary Discuss
Mechanical Operations problems
Search Results
Correct Answer: A hopper is a small bin with a sloping bottom.
Correct Answer: 1/Dp
Correct Answer: immiscible liquids of different
Correct Answer: both(b)&(c).
Correct Answer: secondary
Correct Answer: all (a), (b) and (c).
Correct Answer: Cake resistance is independent of the pressure drop.
Correct Answer: operation is economical.
Correct Answer: Cutting machines mainly employ 'attrition' for size reduction of solids.
Correct Answer: sand
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