Mechanical Operations problems
- 1. 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
Correct Answer: all (a), (b) and (c).
- 2. 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
Correct Answer: Cake resistance is independent of the pressure drop.
- 3. 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
Correct Answer: operation is economical.
- 4. 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
Correct Answer: Cutting machines mainly employ 'attrition' for size reduction of solids.
- 5. 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
Correct Answer: sand
- 6. Which of the following is not a revolving/tumbling mill used for size reduction?
Options- A. Compartment mill
- B. Pebble mill
- C. Cage mill
- D. Rod mill Discuss
Correct Answer: Cage mill
- 7. Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
Options- A. drag
- B. ribbon
- C. screw
- D. slat Discuss
Correct Answer: ribbon
- 8. Gravity stamp mill is meant for the __________ crushing.
Options- A. primary
- B. intermediate
- C. fine
- D. ultrafine Discuss
Correct Answer: fine
- 9. Ribbon blenders are exclusively meant for
Options- A. blending miscible liquids.
- B. non-flowing powder and thin pastes.
- C. bath mixing.
- D. continuous mixing. Discuss
Correct Answer: non-flowing powder and thin pastes.
- 10. The opening of a 200 mesh screen (Taylor series) is
Options- A. 0.0074 cm
- B. 0.0074 mm
- C. 0.0047 cm
- D. 74 mili-microns Discuss
Correct Answer: 0.0074 cm
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