Discussion
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- Question
Screen capacity is not a function of
Options- A. its openings size.
- B. screening mechanism.
- C. screening surface.
- D. atmospheric humidity.
- Correct Answer
- atmospheric humidity.
- 1. 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
- 2. 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
- 3. Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is
Options- A. 0.5
- B. 1
- C. 2
- D. 3 Discuss
- 4. In case of a hammer crusher, the
Options- A. feed may be highly abrasive (Moh's scale >5).
- B. minimum product size is 3 mm.
- C. maximum feed size may be 50 mm.
- D. rotor shaft carrying hammers can be vertical or horizontal. Discuss
- 5. __________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
Options- A. Separation efficiency
- B. Selectivity index
- C. Concentration ratio
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. For spheres, volume shape factor is given by
Options- A. ?(=A/D2)
- B. 2?(=2A/D2)
- C. ?/6(=V/D3)
- D. AD/V Discuss
Mechanical Operations problems
Search Results
Correct Answer: has a higher length/diameter ratio.
Correct Answer: open sand
Correct Answer: 1
Correct Answer: rotor shaft carrying hammers can be vertical or horizontal.
Correct Answer: Selectivity index
Correct Answer: Screw conveyor
Correct Answer: cake
Correct Answer: Helical screw
Correct Answer: ball mill
Correct Answer: ?/6(=V/D3)
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