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February 2019

The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3)_________________?

Mechanical Operations /
The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3)_________________?

A. 3.6 AVS.ρ
B. 3.6 A.V.ρ
C. 3.6 A.S. ρ
D. 3.6 AVS/ρ
Answer: Option

The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3)_________________? Read More »

Mechanical Operations

During size reduction by a jaw crusher, the energy consumed decreases with the__________________?

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

A. Decreasing size of product at constant size of feed
B. Decreasing machine capacity
C. Increasing size of feed at constant reduction ratio
D. None of these

During size reduction by a jaw crusher, the energy consumed decreases with the__________________? Read More »

Mechanical Operations

Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?

Mechanical Operations /
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?

A. Bronze
B. Stainless steel
C. Flint or porcelain
D. Concrete

Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________? Read More »

Mechanical Operations

Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?

Mechanical Operations /
Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?

A. Clarification
B. Classification
C. Elutriation
D. Sedimentation

Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________? Read More »

Mechanical Operations