Chemical Engineering — Test 75
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Question 1
Sphericity of raschig ring (whose length and diameter are equal) is___________________?
Question 2
Which of the following gives the crushing energy required to create new surface ?
Question 3
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?
Question 4
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?
Question 5
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?
Question 6
_______________ centrifuge is the most suitable for separation of non-friable crystals?
Question 7
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?
Question 8
A _______________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?
Question 9
At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?
Question 10
The critical speed of a trommel (N) is related to its dia D. as _____________________?