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- Question
__________ centrifuge is the most suitable for separation of non-friable crystals.
Options- A. Tubular bowl
- B. Disc-bowl
- C. Perforated horizontal basket continuous
- D. Suspended batch basket
- Correct Answer
- Perforated horizontal basket continuous
- 1. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
Options- A. electromagnets
- B. cams or eccentric shafts
- C. unblanced fly wheels
- D. either (a), (b) or (c). Discuss
- 2. The inlet pressure in a constant rate filtration
Options- A. increases continuously
- B. decreases gradually
- C. remains constant
- D. none of these Discuss
- 3. Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.
Options- A. cage
- B. hammer
- C. both (a) & (b)
- D. id) neither (a) nor (b) Discuss
- 4. Work index is defined as the
Options- A. gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.
- B. energy needed to crush one tonne of feed to 200 microns.
- C. energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen.
- D. energy needed to crush one ton of feed to 100 microns. Discuss
- 5. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
Options- A. concentrate
- B. tailing
- C. middling
- D. none of these. Discuss
- 6. Raw materials are charged in the iron blast furnace using
Options- A. bucket elevator
- B. skip hoist
- C. screw conveyor
- D. none of these Discuss
- 7. Which of the following screens has the maximum capacity?
Options- A. Grizzlies
- B. Trommels
- C. Shaking screen
- D. Vibrating screen Discuss
- 8. A propeller agitator
Options- A. produces mainly axial flow.
- B. is used for mixing high viscosity pastes.
- C. runs at very slow speed (2 rpm).
- D. all (a), (b) and (c) Discuss
- 9. Removal of activated carbon from glycerine is done by
Options- A. plate and frame filter
- B. rotary vacuum filter
- C. batch basket centrifuge
- D. none of these Discuss
- 10. Which of the following is not used as a surface active agent in a flocculation operation?
Options- A. Sodium silicate
- B. Quartz
- C. Lime
- D. Alumina Discuss
Mechanical Operations problems
Search Results
Correct Answer: either (a), (b) or (c).
Correct Answer: increases continuously
Correct Answer: both (a) & (b)
Correct Answer: gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen.
Correct Answer: middling
Correct Answer: skip hoist
Correct Answer: Vibrating screen
Correct Answer: produces mainly axial flow.
Correct Answer: plate and frame filter
Correct Answer: Quartz
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