Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 314 of 557.

Chemical Engineering MCQs

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A screen is said to be blinded, when the________?

A.Screen capacity is abruptly increased

B.Under-sizes are retained in oversize fraction

C.Screen is plugged with solid particles

D.Over-sizes are present in undersize fraction

Explanation: The correct answer is Screen is plugged with solid particles.

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Specific heating capacity of a furnace is expressed as________?

A.Weight heated/furnace volume

B.Weight heated/hr

C.Weight heated/hr/furnace volume

D.None of these

Explanation: The correct answer is Weight heated/hr/furnace volume.

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The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the________?

A.Phase rule

B.Theoretical equations

C.Experimental data

D.Empirical equations

Explanation: The correct answer is Phase rule.

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Wrought iron is not________?

A.Ductile & resistant to corrosion/rusting

B.Having maximum tensile strength along the lines of slag distribution

C.Weldable easily

D.Having uniform strength in all directions

Explanation: The correct answer is Having uniform strength in all directions.

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Production rate ________ with increased fineness, with a given energy input to the size reduction machine?

A.Remains unchanged

B.May increase or decrease; depends on the machine

C.Decreases

D.Increases

Explanation: The correct answer is Decreases.

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Esterification reaction produces ________?

A.Soap

B.Mercaptans

C.Vanaspati

D.Detergent

Explanation: The correct answer is Soap.

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In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________?

A.Range is 15°F

B.Both A. & B.

C.Approach is 10°F

D.Neither A. nor B.

Explanation: The correct answer is Both A. & B..

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A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________?

A.160

B.150

C.125

D.133

Explanation: The correct answer is 160.

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It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%)?

A.71 min

B.15 min

C.94 min

D.51 min

Explanation: The correct answer is 71 min.

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The most commonly used feed stock for the reforming reactor is ________?

A.Residuum

B.Casing head gasoline

C.Heavy fuel oil

D.Straight run gasoline

Explanation: The correct answer is Straight run gasoline.

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In flue gas analysis by Orsat’s apparatus, carbon dioxide is absorbed by________?

A.Potassium hydroxide

B.Dilute potassium carbonate

C.Alkaline pyrogallol solution

D.Cuprous chloride

Explanation: The correct answer is Potassium hydroxide.

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Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is________?

A.Both B. and C.

B.Proportional to the viscosity & density of the gas

C.Inversely proportional to viscosity of gas

D.Proportional to the pressure of the gas

Explanation: The correct answer is Both B. and C..

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Which of the following is a natural polyamide fiber?

A.Wool

B.Cotton

C.None of these

D.Silk

Explanation: The correct answer is Wool.

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Flash point of most vegetable oils is about ________ °C?

A.100

B.50

C.300

D.200

Explanation: The correct answer is 200.

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“Breathing loss” on storage of gasoline occurs due to the ________?

A.Neither A. nor B.

B.Fluctuation of ambient temperature during day and night

C.Presence of unsaturated air

D.Both A. and B.

Explanation: The correct answer is Fluctuation of ambient temperature during day and night.

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