Mechanical Operations problems
- 1. Vertical transportation of materials can be done by a/an
Options- A. apron conveyor
- B. pneumatic conveyor
- C. bucket elevator
- D. both(b)&(c) Discuss
Correct Answer: both(b)&(c)
- 2. Mixer used for rubber compounding is
Options- A. mixer-extruder
- B. banbury internal mixer
- C. muller mixer
- D. pug mill Discuss
Correct Answer: banbury internal mixer
- 3. If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
Options- A. linear speed of the basket is doubled.
- B. linear speed of the basket is halved.
- C. centrifugal force is doubled.
- D. capacity of centrifuge is increased. Discuss
Correct Answer: centrifugal force is doubled.
- 4. 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
Correct Answer: none of these
- 5. 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
Correct Answer: Blending of immiscible liquids.
- 6. 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
Correct Answer: maximum porosity at the upstream side.
- 7. Filter medium resistance is important during the __________ of filtration.
Options- A. early stages.
- B. final stages.
- C. entire process.
- D. none of these. Discuss
Correct Answer: early stages.
- 8. For spheres, the specific surface shape factor is given by
Options- A. AD/V
- B. D/V
- C. A/V
- D. AD/V Discuss
Correct Answer: AD/V
- 9. 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 Discuss
Correct Answer: Np ? 1/NRe
- 10. 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
Correct Answer: increases capacity
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