Mechanical Operations MCQ Questions & Answers | Chemical Engineering Page-13 section-3

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61.
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

A. Density separation

B. Differential wettability

C. Size

D. Volatile matter content

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62.
Which of the following is the most suitable for handling fibrous and dense slurries?

A. Propeller agitator

B. Cone type agitator

C. Turbine agitator

D. Radial propeller agitator

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63.
For efficient grinding, ball mills must be operated

A. At a speed less than the critical speed

B. At a speed more than the critical speed

C. At a speed equal to the critical speed

D. With minimum possible small balls

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64.
Rittinger's crushing law states that

A. Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product

B. Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

C. Work required in crushing is proportional to the new surface created

D. For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

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65.
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

A. 1.0

B. 0.5

C. 1.34

D. 4.34

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Mechanical Operations MCQ Questions & Answers | Chemical Engineering

61. 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

Answer & Solution

62. Which of the following is the most suitable for handling fibrous and dense slurries?

Answer & Solution

63. For efficient grinding, ball mills must be operated

Answer & Solution

64. Rittinger's crushing law states that

Answer & Solution

65. Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

Answer & Solution

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61.
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

62.
Which of the following is the most suitable for handling fibrous and dense slurries?

63.
For efficient grinding, ball mills must be operated

64.
Rittinger's crushing law states that

65.
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.