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February 2019

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?

Mechanical Operations /
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?

A. At time zero
B. At the end of filtration
C. When half the filtrate has been obtained
D. At the end of filtration, but decreases with time subsequently

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________? Read More »

Mechanical Operations

Rittinger’s crushing law states that_____________________?

Mechanical Operations /
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

Rittinger’s crushing law states that_____________________? Read More »

Mechanical Operations

The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________?

Mechanical Operations /
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________?

A. N°
B. N1
C. N2
D. N3

The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________? Read More »

Mechanical Operations