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- Question
Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
Options- A. easier grindability
- B. poor grindability
- C. high power consumption in grinding
- D. none of these
- Correct Answer
- easier grindability
- 1. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
Options- A. c/s
- B. s/c
- C. s . c
- D. 1/s . c Discuss
- 2. Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
Options- A. filtering
- B. washing
- C. drying
- D. all (a), (b) & (c) Discuss
- 3. The operating speed of a ball mill should be __________ the critical speed.
Options- A. less than
- B. much more than
- C. at least equal to
- D. slightly more than Discuss
- 4. Shape factor for a cylinder whose length equals its diameter is
Options- A. 1.5
- B. 0.5
- C. 1.0
- D. 2.0 Discuss
- 5. Moore filter is a __________ filter.
Options- A. leaf
- B. press
- C. rotary
- D. sand Discuss
- 6. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
Options- A. Kozney-Karman
- B. Hagen-Poiseulle's
- C. Fanning's
- D. Kremser Discuss
- 7. Energy consumed for crushing one ton of material ranges from __________ kWh.
Options- A. 0.01 to 0.1
- B. 0.5 to 1.5
- C. 2 to 3.5
- D. 4 to 5. Discuss
- 8. Use of baffles in agitators help in minimising the __________ tendency.
Options- A. swirling
- B. vortexing
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 9. The crushed material received for separation is called feed or
Options- A. tailing
- B. heading
- C. concentrate
- D. middling Discuss
- 10. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
Options- A. bag filter
- B. electrostatic precipitator
- C. cyclone separator
- D. wet scrubber Discuss
Mechanical Operations problems
Search Results
Correct Answer: c/s
Correct Answer: all (a), (b) & (c)
Correct Answer: less than
Correct Answer: 1.5
Correct Answer: leaf
Correct Answer: Kozney-Karman
Correct Answer: 0.5 to 1.5
Correct Answer: both (a) & (b)
Correct Answer: heading
Correct Answer: electrostatic precipitator
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