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.Management Sciences
Category: 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________________?
A. Easier grindability
B. Poor grindability
C. High power consumption in grinding
D. None of these
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?
A. Kozeny-Carman equation
B. Leva’s equation
C. Blake-Plummer equation
D. None of these
Which one is a filter aid ?
A. Canvas fabric
B. Diatomaceous earth
C. Calcined lime
D. None of these
The critical speed of a trommel (N) is related to its dia D. as _____________________?
A. N ∝ 1/√D
B. N ∝ √D
C. N ∝ D
D. N ∝ 1/D
_____________________ baffles are provided in ball mills ?
A. Horizontal
B. No
C. Only two
D. None of these
A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?
A. Compressible cakes and laminar
B. Incompressible cake and laminar
C. Compressible cake and turbulent
D. Incompressible cake and turbulent
Cake resistance is___________________?
A. Important in the beginning of filtration
B. Decreased with the time of filtration
C. Independent of pressure drop
D. None of these
Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?
A. 0.2 to 0.8
B. 5 to 25
C. 50 to 100
D. 100 to 250
Balls for ball mills are never made of_________________?
A. Forged/cast steel
B. Lead
C. Cast iron
D. Alloy steel
Pick out the wrong statement?
A. Close circuit grinding is more economical than open circuit grinding
B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement ‘industries’
C. The equipment used for the removal of traces of solids from a liquid is called a classifier
D. Size enlargement is a mechanical operation exemplified by medicinal tablet making
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