Discussion
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- Question
During agitation of liquids, power consumption during laminar flow is not proportional to the
Options- A. density of the liquid
- B. viscosity of the liquid
- C. cube of impeller diameters
- D. square of rotational speed.
- Correct Answer
- density of the liquid
- 1. Ultrafine grinders operate principally by
Options- A. slow compression
- B. impact
- C. attrition
- D. cutting action Discuss
- 2. For the preliminary breaking of hard rock, we use a
Options- A. gyratory crusher
- B. ball mill
- C. tube mill
- D. squirrel-cage disintegrator Discuss
- 3. In screen analysis, the notation +5 mm/-10 mm means particles passing through
Options- A. 10 mm screen and retained on 5 mm screen.
- B. 5 mm screen and retained on 10 mm screen.
- C. both 5 mm and 10 mm screens.
- D. neither 5 mm nor 10 mm screen. Discuss
- 4. Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.
Options- A. 200°C and 5 atm.
- B. 1000°C and 10 atm.
- C. 500°C and 50 atm.
- D. 1000°C and 500 atm. Discuss
- 5. The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be
Options- A. 0.5 Wi
- B. Wi
- C. 1.34 Wi
- D. 3.34 Wi Discuss
- 6. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
Options- A. Rod mill
- B. Fluid energy mill
- C. Gyratory crusher
- D. Ball mill Discuss
- 7. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the
Options- A. coagulation
- B. flocculation
- C. sedimentation
- D. clarification Discuss
- 8. Crushing efficiency of a machine ranges between __________ percent.
Options- A. 0.1 to 2
- B. 5 to 10
- C. 20 to 25
- D. 50 to 70 Discuss
- 9. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
Options- A. ?(=A/D2)
- B. ?/6(=V/D3)
- C.
- D. None of these. Discuss
- 10. Tube mill compared to ball mill
Options- A. produces finer products.
- B. is long in comparison with its diameter.
- C. uses smaller balls.
- D. all (a), (b) & (c). Discuss
Mechanical Operations problems
Search Results
Correct Answer: attrition
Correct Answer: gyratory crusher
Correct Answer: 10 mm screen and retained on 5 mm screen.
Correct Answer: 1000°C and 10 atm.
Correct Answer: 1.34 Wi
Correct Answer: Gyratory crusher
Correct Answer: sedimentation
Correct Answer: 0.1 to 2
Correct Answer: ?(=A/D2)
Correct Answer: all (a), (b) & (c).
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