Mechanical Operations problems
- 1. A belt conveyor used for the transportation of materials can
Options- A. run upto 1 km.
- B. travel at a speed upto 300 metres/minute.
- C. handle materials upto 5000 tons/hr.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 2. Which of the following is a batch sedimentation equipment?
Options- A. Dust catcher
- B. Filter thickener
- C. Dry cyclone separator
- D. Rotary sprayer scrubber. Discuss
Correct Answer: Filter thickener
- 3. Filtration rate does not depend upon the
Options- A. pressure drop & area of filtering surface.
- B. resistance of the cake & the septum.
- C. properties of the cake & the filtrate.
- D. none of these. Discuss
Correct Answer: none of these.
- 4. 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
Correct Answer: middling
- 5. 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
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.
- 6. 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
Correct Answer: both (a) & (b)
- 7. The inlet pressure in a constant rate filtration
Options- A. increases continuously
- B. decreases gradually
- C. remains constant
- D. none of these Discuss
Correct Answer: increases continuously
- 8. 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
Correct Answer: either (a), (b) or (c).
- 9. __________ 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 Discuss
Correct Answer: Perforated horizontal basket continuous
- 10. 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
Correct Answer: skip hoist
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