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Mechanical Operations

Mechanical Operations
Mixing of plastic solids is generally facilitated by

Kneading
None of these
Mastication
Dispersion

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Mechanical Operations
The work index in Bond's law for crushing of solids has the following dimensions

KW/ton
No units (dimensionless)
KWh.m1/2/ton
KWh/ton

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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

N²
N°
N¹
N³

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Mechanical Operations
Screen capacity is expressed in terms of

Both A & B
Tons/ft²
Tons/hr
Tons/hr-ft²

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Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.58
0.68
0.5
0.62

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Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the

Jaw crusher
Jet pulveriser
Ball mill
Tube mill

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