Discussion
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- Question
Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor.
Options- A. drag
- B. ribbon
- C. screw
- D. slat
- Correct Answer
- ribbon
- 1. Which of the following is not a revolving/tumbling mill used for size reduction?
Options- A. Compartment mill
- B. Pebble mill
- C. Cage mill
- D. Rod mill Discuss
- 2. The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.
Options- A. vacuum
- B. sand
- C. plate & frame
- D. rotary Discuss
- 3. Pick out the wrong statement.
Options- A. More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one.
- B. There are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ.
- C. Cutting machines mainly employ 'attrition' for size reduction of solids.
- D. Operating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers. Discuss
- 4. In closed circuit grinding as compared to open circuit grinding, the
Options- A. specific surface of product is more.
- B. product has lesser size uniformity.
- C. production rate at a given limiting size is lower.
- D. operation is economical. Discuss
- 5. Pick out the wrong statement.
Options- A. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant.
- B. Cake resistance is independent of the pressure drop.
- C. Crushing of explosive materials are done by employing drygrinding.
- D. Gyratory crusher is a coarse crusher. Discuss
- 6. Gravity stamp mill is meant for the __________ crushing.
Options- A. primary
- B. intermediate
- C. fine
- D. ultrafine Discuss
- 7. Ribbon blenders are exclusively meant for
Options- A. blending miscible liquids.
- B. non-flowing powder and thin pastes.
- C. bath mixing.
- D. continuous mixing. Discuss
- 8. The opening of a 200 mesh screen (Taylor series) is
Options- A. 0.0074 cm
- B. 0.0074 mm
- C. 0.0047 cm
- D. 74 mili-microns Discuss
- 9. During the washing of cake
Options- A. all the resistances are constant.
- B. filter medium resistance increases.
- C. filter medium resistance decreases.
- D. cake resistance decreases. Discuss
- 10. Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the
Options- A. density separation.
- B. differential wettability.
- C. size.
- D. volatile matter content. Discuss
Mechanical Operations problems
Search Results
Correct Answer: Cage mill
Correct Answer: sand
Correct Answer: Cutting machines mainly employ 'attrition' for size reduction of solids.
Correct Answer: operation is economical.
Correct Answer: Cake resistance is independent of the pressure drop.
Correct Answer: fine
Correct Answer: non-flowing powder and thin pastes.
Correct Answer: 0.0074 cm
Correct Answer: all the resistances are constant.
Correct Answer: density separation.
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