Mechanical Operations problems
- 1. 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
Correct Answer: Gyratory crusher
- 2. 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
Correct Answer: sedimentation
- 3. 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
Correct Answer: 0.1 to 2
- 4. 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
Correct Answer: ?(=A/D2)
- 5. 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
Correct Answer: all (a), (b) & (c).
- 6. 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
Correct Answer: at the end of filtration.
- 7. Filter medium resistance is that offered by the
Options- A. filter cloth.
- B. embedded particles in the septum.
- C. filter cloth and the embedded particle collectively.
- D. none of these. Discuss
Correct Answer: filter cloth and the embedded particle collectively.
- 8. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration.
Options- A. constant rate
- B. varying pressure
- C. varying rate
- D. constant pressure Discuss
Correct Answer: constant rate
- 9. The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
Options- A. Df/Dp
- B. Dp/Df
- C. Df - Dp
- D. none of these Discuss
Correct Answer: Df/Dp
- 10. Fluid energy mill comes in the category of
Options- A. grinder
- B. crusher
- C. cutter
- D. ultrafine grinder Discuss
Correct Answer: ultrafine grinder
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