Mechanical Operations

Which of the following achieves the least reduction ratio for a given feed size ?

Byadmin February 18, 2019August 22, 2021

Which of the following achieves the least reduction ratio for a given feed size ?

A. Jaw crusher
B. Roll crusher
C. Cone crusher
D. Gyratory crusher

Mechanical Operations

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?

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

Read More 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?
Mechanical Operations

Reduction ratio of crushers is the___________________?

Reduction ratio of crushers is the___________________?

A. Ratio of feed opening to discharge opening
B. Ratio of discharge opening to feed opening
C. Determining factor for minimum dia of the feed and the product
D. None of these

Read More Reduction ratio of crushers is the___________________?
Mechanical Operations

Filter aid is used to____________________?

Filter aid is used to____________________?

A. Increase the rate of filtration
B. Decrease the pressure drop
C. Increase the porosity of the cake
D. Act as a support base for the septum

Read More Filter aid is used to____________________?
Mechanical Operations

Close circuit grinding by a ball mill with air sweeping employs a _______________________?

Close circuit grinding by a ball mill with air sweeg employs a _______________________?

A. Classifier
B. Cyclone separator between mill & classifier
C. Both A. & B.
D. Neither A. nor B.

Read More Close circuit grinding by a ball mill with air sweeping employs a _______________________?
Mechanical Operations

Ribbon blenders are exclusively meant for __________________?

Ribbon blenders are exclusively meant for __________________?

A. Blending miscible liquids
B. Non-flowing powder and thin pastes
C. Bath mixing
D. Continuous mixing

Read More Ribbon blenders are exclusively meant for __________________?
Mechanical Operations

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________________?

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________________?

A. Easier grindability
B. Poor grindability
C. High power consumption in grinding
D. None of these

Read More 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________________?

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