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

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

0.5

0.68

0.58

0.62

0.5

0.68

0.58

0.62

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Mechanical Operations
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

50

70

35

85

50

70

35

85

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

None of these

Decreasing size of product at constant size of feed

Increasing size of feed at constant reduction ratio

Decreasing machine capacity

None of these

Decreasing size of product at constant size of feed

Increasing size of feed at constant reduction ratio

Decreasing machine capacity

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re-1.0

Po ∝ Re0.5

Po ∝ Re1.0

Po ∝ Re0.0

Po ∝ Re-1.0

Po ∝ Re0.5

Po ∝ Re1.0

Po ∝ Re0.0

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Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Weber

Peclet

Brinkman

Schmidt

Weber

Peclet

Brinkman

Schmidt

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Mechanical Operations
Crushing efficiency is the ratio of the

Energy absorbed by the solid to that fed to the machine

Energy fed to the machine to the surface energy created by crushing

Energy absorbed by the solid to the surface energy created by crushing

Surface energy created by crushing to the energy absorbed by the solid

Energy absorbed by the solid to that fed to the machine

Energy fed to the machine to the surface energy created by crushing

Energy absorbed by the solid to the surface energy created by crushing

Surface energy created by crushing to the energy absorbed by the solid

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Mechanical Operations

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

Mechanical Operations In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

Mechanical Operations During size reduction by a jaw crusher, the energy consumed decreases with the

Mechanical Operations In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Mechanical Operations Crushing efficiency is the ratio of the

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

Mechanical Operations
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Mechanical Operations
Crushing efficiency is the ratio of the