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Mechanical Operations

Mechanical Operations
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?

Check plates
Jaw plates
Crush shaft
Toggles

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Mechanical Operations
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

Resins
Waxes
Hard rubber
Gums

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Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

√2
1
0.5
√3

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Mechanical Operations
Weber number is significant and is concerned with the

Suspension of solid in liquid
Dispersion of liquid in liquid
Liquid-liquid mixing
Solid-liquid mixing

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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
N³
N¹
N°

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 dp Sp/Vp
Φs = dp Sp/Vp
Φs = 6 Vp/dp sp
Φs = Vp/dp sp

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