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Mechanical Operations

Mechanical Operations
The grinding in a hammer crusher takes place due to the

Impact
Neither A nor B
Attrition
Both A & B

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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

N°
N³
N²
N¹

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Mechanical Operations
For classification of potable (drinking) water, we use a __________ filter.

Plate and frame
Vacuum leaf
Rotary vacuum
Gravity sand

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Mechanical Operations
Energy consumption in a crusher decreases with increase in the

Size of the product (at constant feed size)
All of these
Size of feed (at constant reduction ratio)
Capacity of the crushing machine

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Mechanical Operations
Gizzlies are used for separating __________ solids.

Any size
Coarse
Fine
None of these

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Mechanical Operations
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

2.76
0.5
0.66
1

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