Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 111 of 557.

Chemical Engineering MCQs

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Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)________?

A.Are used for leaf and coiled springs

B.Is tempered at 850°C

C.Do not have good resilience properties

D.Do not require heat treatment for any of its applications

Explanation: The correct answer is Are used for leaf and coiled springs.

Submitted by: Academy of Pakistan

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Perspex can be used as a substitute of glass. Its monomer is________?

A.Tetrafluoroethylene

B.DMT

C.Butadiene

D.Methyl methacrylate

Explanation: The correct answer is Methyl methacrylate.

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Which of the following equations is valid for laminar flow of a fluid through packed bed?

A.Blake-Plummer equation

B.Fanning equation

C.Kozeny – Karman equation

D.Hagen-Poiseuille equation

Explanation: The correct answer is Kozeny – Karman equation.

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Higher concentration of CO2 in atmosphere________?

A.Reflects and absorbs the longer wavelength (infra-red) radiations

B.All A., B. and C.

C.Allows visible solar radiation (ultraviolet) of short wave-length to pass through

D.Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming

Explanation: The correct answer is All A., B. and C..

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Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at ________ °C?

A.1400-1450

B.500-750

C.250-300

D.950-1050

Explanation: The correct answer is 1400-1450.

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Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the________?

A.Calorific value

B.Heat of formation

C.Heat of combustion

D.Heat of reaction

Explanation: The correct answer is Heat of combustion.

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Shrinkage volume in cement setting does not depend upon the ________?

A.Drying period

B.Ambient temperature fluctuation

C.Sand to cement ratio

D.Water to cement ratio

Explanation: The correct answer is Sand to cement ratio.

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In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit)?

A.Parallel

B.Both A. & B.

C.Straight

D.Neither A. nor B.

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

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‘Wind loss’ resulting from unscientific storage of coal may be the order of about ________ percent?

A.2.5

B.14.5

C.7.5

D.10.5

Explanation: The correct answer is 2.5.

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Which of the following methods of depreciation calculations results in book values greater than those obtained with straight line method?

A.Declining balance method

B.Sinking fund method

C.Sum of the years digit method

D.Multiple straight line method

Explanation: The correct answer is Sinking fund method.

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Hydrocyanic acid (HCN) is used as an insecticide for________?

A.Controlling timber degradation by ants

B.Potato beetle

C.Citrus fruits

D.Controlling poultry lice

Explanation: The correct answer is Citrus fruits.

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Highly viscous liquids & pastes are agitated by________?

A.None of these

B.Propellers

C.Turbine agitators

D.Multiple blade paddles

Explanation: The correct answer is Multiple blade paddles.

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In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

A.Use of equation of state

B.None of these

C.Fugacity co-efficient

D.Activity co-efficient

Explanation: The correct answer is Activity co-efficient.

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Flash distillation is suitable for separating the constituents of a binary system, which ________?

A.Form constant boiling azeotrope

B.Form minimum boiling azeotrope

C.Have very wide boiling points

D.Have very close boiling points

Explanation: The correct answer is Have very wide boiling points.

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Very fine suspended and colloidal impurities are removed from water by a process called________?

A.Coagulation

B.Sedimentation

C.Disinfection

D.Softening

Explanation: The correct answer is Coagulation.

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