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- Question
In a roll crusher, the specific power consumption and the production rate is affected by the
Options- A. reduction ratio.
- B. differential roll speed.
- C. both (a) and (b).
- D. neither (a) nor (b).
- Correct Answer
- both (a) and (b).
- 1. Compressibility co-efficient for an absolutely compressible cake is
Options- A. 0
- B. 1
- C. 0 to 1
- D. ? Discuss
- 2. The sphericity of a solid particle of cubical shape is
Options- A. ?
- B. (?/6)1/3
- C. (?/6)1/2
- D. ?/3 Discuss
- 3. A cottrel precipitator makes use of the __________ for dusty air cleaning.
Options- A. electric spark
- B. corrona discharge
- C. alternating current
- D. none of these. Discuss
- 4. __________ mills are termed as disintegrators.
Options- A. Cage
- B. Compartment
- C. Pebble
- D. All tumbling Discuss
- 5. Velocity of a small particle of diameter 'Dp' at a distance 'r' from the rotational axis of a cyclone rotating at an angular speed '?' is given by (the other symbols are as per standard notation)
Options- A.
- B.
- C.
- D.
Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: 1
Correct Answer: (?/6)1/3
Correct Answer: corrona discharge
Correct Answer: Cage
Correct Answer:
Correct Answer: all (a), (b) and (c).
Correct Answer: Filter thickener
Correct Answer: none of these.
Correct Answer: middling
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.
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