Mechanical Operations problems
- 1. 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 Discuss
Correct Answer: kWh/ton
- 2. 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
Correct Answer: deplugging the filter medium.
- 3. 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
Correct Answer: Pug mill
- 4. 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
Correct Answer: both (a) & (b)
- 5. 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
Correct Answer: sizing
- 6. 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
Correct Answer: ball mill
- 7. Gyratory crushers compared to the reciprocating jaw crushers
Options- A. have greater capacity per unit of discharge area.
- B. crush intermittantly.
- C. are less suitable for coarse materials.
- D. have less steady power consumption. Discuss
Correct Answer: have greater capacity per unit of discharge area.
- 8. __________ conveyor is the most suitable for short distance transportation of non-abrasive loose materials like garbage, grain, food wastes etc.
Options- A. Flight
- B. Screw
- C. Drag
- D. Belt Discuss
Correct Answer: Flight
- 9. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for __________ flow of filtrate.
Options- A. compressible cakes and laminar
- B. incompressible cake and laminar
- C. compressible cake and turbulent
- D. incompressible cake and turbulent Discuss
Correct Answer: incompressible cake and laminar
- 10. The reduction ratio for fine grinders is
Options- A. 5-10
- B. 10-20
- C. 20-40
- D. as high as 100 Discuss
Correct Answer: as high as 100
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