Discussion
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- Question
Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
Options- A. decreases
- B. increases
- C. remains unchanged
- D. may increase or decrease; depends on the machine
- Correct Answer
- decreases
- 1. The specific cake resistance for compressible sludges is a function of the pressure drop
Options- A. over cake
- B. over medium
- C. overall
- D. none of these Discuss
- 2. Size reduction does not occur due to compression in case of
Options- A. rod mills
- B. gyratory crushers
- C. jaw crushers
- D. smooth roll crushers Discuss
- 3. Mixing of light fine powder such as insecticides is done by
Options- A. banbery mixer
- B. pug mill
- C. impact wheels
- D. kneader Discuss
- 4. Horsepower required for a roll crusher is directly proportional to its
Options- A. reduction ratio.
- B. capacity.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 5. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
Options- A. jaw crusher
- B. hammer crusher
- C. ball mill
- D. tube mill Discuss
- 6. The unit of specific cake resistance is
Options- A. gm/cm2
- B. cm/gm
- C. cm/gm2
- D. gm/gm Discuss
- 7. Ultra centrifuges are used for the separation of __________ solid particles.
Options- A. coarse
- B. fine
- C. colloidal
- D. dissolved Discuss
- 8. According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively).
Options- A. (S/V)p
- B. (S/V)p
- C. (S/V)2p
- D. (S/V)f Discuss
- 9. Gold ore concentration is mostly done using
Options- A. jigging
- B. tabling
- C. froth floatation
- D. elutriation Discuss
- 10. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.
Options- A. 0.007
- B. 0.30
- C. 50
- D. 0.014 Discuss
Mechanical Operations problems
Search Results
Correct Answer: over cake
Correct Answer: rod mills
Correct Answer: impact wheels
Correct Answer: both (a) & (b).
Correct Answer: hammer crusher
Correct Answer: gm/cm2
Correct Answer: colloidal
Correct Answer: (S/V)p
Correct Answer: tabling
Correct Answer: 0.30
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