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- Question
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
Options- A. N°
- B. N1
- C. N2
- D. N3
- Correct Answer
- N2
- 1. Pine oil used in froth floatation technique acts as a/an
Options- A. collector
- B. modifier
- C. frother
- D. activator Discuss
- 2. In case of a ball mill,
Options- A. coarse feed requires a larger ball.
- B. fine feed requires a larger ball.
- C. operating speed should be more than the critical speed.
- D. none of these Discuss
- 3. Pick out the wrong statement.
Options- A. Denier is defined as weight in gm of 9000 metres length of a fibre, while tex is defined as weight in gm of 1000 metres length of fibre.
- B. Crimp is a measure of the difference between the length of the straightened and unstraightend fibre.
- C. Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
- D. Nylon fibres have greater water absorption capacity than polyester fibres. Discuss
- 4. Pick out the wrong statement.
Options- A. Cold SBR is superior as compared to hot SBR.
- B. Polymerisation temperature can modify the properties of SBR.
- C. Production of cold SBR employs lower pressure as compared to that of hot SBR.
- D. None of these. Discuss
- 5. Polypropylene compared to polythene is
Options- A. harder
- B. stronger
- C. lighter
- D. all (a), (b) and (c) Discuss
- 6. Fibrous material is broken by a
Options- A. rollcrusher
- B. squirrel-cage disintegrator
- C. ball mill
- D. tube mill Discuss
- 7. Grindability of a material does not depend upon its
Options- A. elasticity
- B. hardness
- C. toughness
- D. size Discuss
- 8. Dust laden air can be purified using a
Options- A. cyclone separator
- B. bag filter
- C. gravity settler
- D. tubular centrifuge Discuss
- 9. Crushing efficiency is the ratio of the
Options- A. surface energy created by crushing to the energy absorbed by the solid.
- B. energy absorbed by the solid to that fed to the machine.
- C. energy fed to the machine to the surface energy created by crushing.
- D. energy absorbed by the solid to the surface energy created by crushing. Discuss
- 10. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)
Options- A. 0.01 L.S
- B. 0.087 L.S
- C. L.S
- D. L.S/0.087 Discuss
Mechanical Operations problems
Search Results
Correct Answer: frother
Correct Answer: coarse feed requires a larger ball.
Correct Answer: Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning.
Correct Answer: None of these.
Correct Answer: all (a), (b) and (c)
Correct Answer: squirrel-cage disintegrator
Correct Answer: size
Correct Answer: cyclone separator
Correct Answer: surface energy created by crushing to the energy absorbed by the solid.
Correct Answer: 0.087 L.S
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