Mechanical Operations problems
- 1. Filtration of water in a paper mill is done by a/an __________ filter.
Options- A. open sand
- B. plate and frame
- C. vacuum leaf
- D. sparkler Discuss
Correct Answer: open sand
- 2. A tube mill compared to a ball mill
Options- A. has a higher length/diameter ratio.
- B. produces a coarser product.
- C. has a higher diameter/length ratio.
- D. uses much larger balls. Discuss
Correct Answer: has a higher length/diameter ratio.
- 3. Screen capacity is not a function of
Options- A. its openings size.
- B. screening mechanism.
- C. screening surface.
- D. atmospheric humidity. Discuss
Correct Answer: atmospheric humidity.
- 4. Which is the most suitable conveyor for transportation of sticky material?
Options- A. Apron conveyor
- B. Belt conveyor
- C. Screw conveyor
- D. Pneumatic conveyor Discuss
Correct Answer: Screw conveyor
- 5. The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
Options- A. piping
- B. cake
- C. filter medium
- D. none of these Discuss
Correct Answer: cake
- 6. Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise)?
Options- A. Propeller
- B. Helical screw
- C. Flat blade turbine
- D. Curved blade turbine Discuss
Correct Answer: Helical screw
- 7. Coal is finally pulverised to 200 mesh size for burning in boilers by a
Options- A. hammer crusher
- B. ball mill
- C. roll crusher
- D. gyratory crusher Discuss
Correct Answer: ball mill
- 8. For spheres, volume shape factor is given by
Options- A. ?(=A/D2)
- B. 2?(=2A/D2)
- C. ?/6(=V/D3)
- D. AD/V Discuss
Correct Answer: ?/6(=V/D3)
- 9. Basic slag is not ground in
Options- A. jaw crushers
- B. ball mills
- C. compartment mills
- D. tube mills Discuss
Correct Answer: jaw crushers
- 10. Length/diameter ratio of a ball mill is
Options- A. 1.5
- B. 1
- C. < 1
- D. > 1 Discuss
Correct Answer: < 1
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