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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 5
6.
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.
primary
secondary
fine
ultrafine
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)
π(=A/D2)
π/6(=V/D3)
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).
Df/Dp
Dp/Df
Df - Dp
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Pick out the wrong statement pertaining to the turbine agitator.
Recommended peripheral speed for the turbine agitator is 200-250 metres/minute.
Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow.
Generally, the diameter of the agitator is kept between l/3rd to l/6th of the tank diameter while the blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter).
Turbine agitator should be located at a height not less than one agitator diameter length from the bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two agitators should be used.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
A fluid energy mill is used for
cutting
grinding
ultra grinding
crushing
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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