Discussion
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- Question
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
Options- A. D
- B. 1/D
- C. D2.5
- D. 1/D2.5
- Correct Answer
- D2.5
- 1. Tabular bowl centrifuges as compared to disk bowl centrifuges
Options- A. operate at higher speed.
- B. employ bowl of larger diameter.
- C. can not be operated under pressure/vacuum.
- D. can't be used for separation of fine suspended solids from a liquid. Discuss
- 2. Jigging is a technique by which different particles can be
Options- A. separated by particle size.
- B. separated by particle density.
- C. separated by particle shape.
- D. mixed. Discuss
- 3. The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 ?rn is
Options- A. 6.35 kWh/ton
- B. 9.0 kWh/ton
- C. 18 kWh/ton
- D. 25.4 kWh/ton Discuss
- 4. Highly viscous liquids & pastes are agitated by
Options- A. propellers
- B. turbine agitators
- C. multiple blade paddles
- D. none of these Discuss
- 5. Diatomaceous earth is a/an
Options- A. explosive
- B. filter aid
- C. filter medium
- D. catalyst Discuss
- 6. Diesel index.(an alternative index for expressing the quality of diesel) is
Options- A. determined by using a test engine.
- B. not related to aniline point.
- C. equal to cetane number plus 3.
- D. all (a), (b) & (c). Discuss
- 7. __________ determination is not a very significant and important test for gasoline.
Options- A. Gum & sulphur content
- B. Viscosity
- C. Octane number
- D. Reid vapor pressure Discuss
- 8. In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
Options- A. sulphur increases
- B. sulphur decreases
- C. nitrogen decreases
- D. none of these Discuss
- 9. Which of the following tests is not done for transformer oil?
Options- A. Flash point and acid value.
- B. Aniline point.
- C. Dielectric strength.
- D. Copper strip corrosion test. Discuss
- 10. Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
Options- A. propane & phenol-cresol mixture.
- B. methyl ethyl ketone & glycol.
- C. phenol & furfural.
- D. propane & liquid sulphur dioxide. Discuss
Mechanical Operations problems
Search Results
Correct Answer: operate at higher speed.
Correct Answer: separated by particle size.
Correct Answer: 18 kWh/ton
Correct Answer: multiple blade paddles
Correct Answer: filter aid
Correct Answer: equal to cetane number plus 3.
Correct Answer: Viscosity
Correct Answer: sulphur increases
Correct Answer: Aniline point.
Correct Answer: propane & phenol-cresol mixture.
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