Which of the following is not categorised as a "mechanical operation”? (A) Agitation (B) Filtration (C) Size enlargement (D) Humidification

Which of the following is not categorised as a "mechanical operation”?
(A) Agitation
(B) Filtration
(C) Size enlargement
(D) Humidification
by

1 Answer

Answer :

(D) Humidification
by

Related questions

Pick out the wrong statement. (A) Recycled coarse material to the grinder by a classifier is termed as circulating load (B) Wear and tear in wet crushing is more than that in dry crushing of materials (C) Size enlargement (opposite of size reduction) is not a mechanical operation (D) A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas

Description : Pick out the wrong statement. (A) Recycled coarse material to the grinder by a classifier is termed as circulating load (B) Wear and tear in wet crushing is more than that in dry crushing of ... a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas

Last Answer : (C) Size enlargement (opposite of size reduction) is not a mechanical operation

Pick out the wrong statement. (A) Close circuit grinding is more economical than open circuit grinding (B) Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries' (C) The equipment used for the removal of traces of solids from a liquid is called a classifier (D) Size enlargement is a mechanical operation exemplified by medicinal tablet making

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Last Answer : (C) The equipment used for the removal of traces of solids from a liquid is called a classifier

Pick out the correct statement. (A) Plastic chips are called non-cohesive solids (B) Kick's crushing law is, P/m = K . ln (D̅sa /Ds̅b ) (C) Communition is a generic term for size enlargement operation (D) Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'

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The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is (A) Natural draft cooling tower (B) Induced draft cooling tower (C) Spray chamber (D) None of these

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Last Answer : (C) Spray chamber

Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the (A) High evaporation losses of water (B) High pressure drop of the gas (C) Difficulty in its fabrication (D) None of these

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Last Answer : (B) High pressure drop of the gas

Pick out the wrong statement. (A) Mechanical agitation is required, if the system has low interfacial tension (B) Sieve tray towers are generally used for systems having low interfacial tension (C) When Henry's law constant is very small, then the mass transfer rate is controlled by the gas film resistance (D) Taylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar and turbulent layers

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Leaching rate is independent of the (A) Agitation (B) Temperature (C) Particle size (D) None of these

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Last Answer : d.No change in the size of an object

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example. (a) Colour change in Chamaeleon (b) Enlargement of body size by swallowing air in puffer fish (c) Poison fangs in snakes (d) Melanism in moths

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For which of the following unit operations, Lewis number is ofsignificance?(A) Adsorption(B) Binary distillation(C) Gas absorption(D) Humidification

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Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C? (A) Humidification only (B) Heating only (C) Both heating and humidification (D) Evaporative cooling

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Last Answer : (A) Insoluble in the liquid

Duhring’s rule is important in solving problems on (A) Distillation (B) Crystallisation (C) Evaporation (D) Humidification

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Last Answer : (C) Evaporation

Glycerine is not used in the (A) Manufacture of explosive (B) Conditioning and humidification of tobacco (C) Manufacture of pharmaceuticals (D) None of these

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A 'unit process' is exemplified by the (A) Distillation (B) Hydrogenation of oils (C) Absorption (D) Humidification

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