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- Question
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as
Options- A. Np ? NRe
- B. Np ? NRe
- C. Np ? constant
- D. Np ? 1/NRe
- Correct Answer
- Np ? 1/NRe
- 1. For spheres, the specific surface shape factor is given by
Options- A. AD/V
- B. D/V
- C. A/V
- D. AD/V Discuss
- 2. Filter medium resistance is important during the __________ of filtration.
Options- A. early stages.
- B. final stages.
- C. entire process.
- D. none of these. Discuss
- 3. A compressible cake has the
Options- A. maximum porosity at the upstream side.
- B. maximum porosity at the filter medium.
- C. same porosity throughout the cake thickness.
- D. none of these. Discuss
- 4. Which of the following is not accomplished by agitation of liquids in agitators?
Options- A. Dispersing gas in liquid.
- B. Blending of immiscible liquids.
- C. Dispersing immiscible liquid in form of emulsion.
- D. Suspending solid particles. Discuss
- 5. The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is
Options- A. 1.5
- B. 1
- C. 2
- D. none of these Discuss
- 6. Wet grinding in a revolving mill __________ as compared to dry grinding.
Options- A. gives less wear on chamber walls
- B. requires more energy
- C. increases capacity
- D. complicates handling of the product Discuss
- 7. In case of a hammer crusher, the final product size depends on the
Options- A. feed rate.
- B. rotor speed.
- C. clearance between hammer & grinding plates.
- D. all (a), (b) and (c). Discuss
- 8. 200 mesh seive size corresponds to __________ microns.
Options- A. 24
- B. 74
- C. 154
- D. 200 Discuss
- 9. For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a
Options- A. Buhrstone mill
- B. ball mill
- C. crushing rolls
- D. hammer mill Discuss
- 10. Screen efficiency is
Options- A. recovery/rejection
- B. recovery
- C. rejection
- D. none of these Discuss
Mechanical Operations problems
Search Results
Correct Answer: AD/V
Correct Answer: early stages.
Correct Answer: maximum porosity at the upstream side.
Correct Answer: Blending of immiscible liquids.
Correct Answer: none of these
Correct Answer: increases capacity
Correct Answer: all (a), (b) and (c).
Correct Answer: 74
Correct Answer: Buhrstone mill
Correct Answer: none of these
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