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- Question
The work index in Bond's law for crushing of solids has the following dimensions
Options- A. no units (dimensionless)
- B. kWh/ton
- C. kW/ton
- D. kWh.m1/2/ton
- Correct Answer
- kWh/ton
- 1. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
Options- A. 0.1
- B. 0.4
- C. 0.6
- D. none of these Discuss
- 2. __________ conveyor is the most suitable for long distance transportation of cold, non-abrasive granular/irregular shape/fine materials.
Options- A. Bucket
- B. Belt
- C. Screw
- D. Apron Discuss
- 3. The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
Options- A. feed material.
- B. type of crushing machine.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 4. According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than
Options- A. 0.00184
- B. 0.0184
- C. 0.184
- D. 1.84 Discuss
- 5. What is the selectivity index, if the grade of tailings & concentrate is the same?
Options- A. 0
- B. ?
- C. 1
- D. 0.5 Discuss
- 6. In filtration, the use of 'filter aid' helps in
Options- A. reducing the filtration pressure.
- B. accelerating the rate of filtration.
- C. deplugging the filter medium.
- D. enhancing the cake porosity in case of a dense impermeable cake. Discuss
- 7. Which of the following clay mixing devices is vacuum operated for deairation of clay?
Options- A. Banbery mixer
- B. Pug mill
- C. Muller-mixer
- D. None of these Discuss
- 8. Width and speed of a conveyor belt depends upon the __________ of the material.
Options- A. lump size
- B. bulk density
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 9. Separation of materials of the same density based on their sizes by using then-different rates of flow is called
Options- A. sorting
- B. sizing
- C. flocculation
- D. elutriation Discuss
- 10. To get a fine talc powder from its granules, the equipment used is
Options- A. roller crusher
- B. ball mill
- C. jaw crusher
- D. gyratory crusher Discuss
Mechanical Operations problems
Search Results
Correct Answer: 0.6
Correct Answer: Belt
Correct Answer: both (a) & (b).
Correct Answer: 0.0184
Correct Answer: 1
Correct Answer: deplugging the filter medium.
Correct Answer: Pug mill
Correct Answer: both (a) & (b)
Correct Answer: sizing
Correct Answer: ball mill
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