Discussion
Home ‣ Chemical Engineering ‣ Mechanical Operations Comments
- Question
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
- Correct Answer
- Gyratory crusher
- 1. 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. Discuss
- 2. Ultrafine grinders operate principally by
Options- A. slow compression
- B. impact
- C. attrition
- D. cutting action Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
Options- A. at time zero.
- B. at the end of filtration.
- C. when half the filtrate has been obtained.
- D. at the end of filtration, but decreases with time subsequently. Discuss
Mechanical Operations problems
Search Results
Correct Answer: density of the liquid
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: sedimentation
Correct Answer: 0.1 to 2
Correct Answer: ?(=A/D2)
Correct Answer: all (a), (b) & (c).
Correct Answer: at the end of filtration.
Comments
There are no comments.More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.