Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 181 of 557.

Chemical Engineering MCQs

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‘Flare tower’ used in industry is meant for________?

A.Cooling of furnace exhaust gases

B.Absorbing the pollutant gases from the furnace exhaust

C.Venting off (after burning) the excess inflammable/toxic gases at high pressure

D.None of these

Explanation: The correct answer is Venting off (after burning) the excess inflammable/toxic gases at high pressure.

Submitted by: Academy of Pakistan

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Pick out the correct statement?

A.Melting of ice involves increase in enthalpy and a decrease in randomness

B.The internal energy of an ideal gas depends only on its pressure

C.Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

D.Maximum work is done under reversible conditions

Explanation: The correct answer is Maximum work is done under reversible conditions.

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In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube)?

A.(P2 – rd2/4)/rd

B.4P2/πd

C.πd/4P2

D.4(P2 – πd2/4)/πd

Explanation: The correct answer is 4(P2 – πd2/4)/πd.

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A particular coal is said to be free burning when it ________?

A.Shows little or no fusing action

B.Gives smokeless burning

C.None of these

D.Burns completely

Explanation: The correct answer is Shows little or no fusing action.

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Critical temperature is defined as the temperature above which a gas will________?

A.Immediately liquify

B.Never liquify however high the pressure may be

C.None of these

D.Not liquify (barring exceptions)

Explanation: The correct answer is Never liquify however high the pressure may be.

Submitted by: Academy of Pakistan

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________ chart is known as transient heat conduction chart?

A.Cox

B.Heisler’s

C.Mollier’s

D.Dirhing’s

Explanation: The correct answer is Dirhing’s.

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Semibatch reactor is preferred, when a/an________?

A.A highly exothermic reaction is to be controlled

B.Undesirable side reaction (at high concentration of one of the reactants) is to be avoided

C.All A., B., and C.

D.A gas is to be reacted with liquid (e.g. hydrogenation of fat)

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

Submitted by: Academy of Pakistan

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Which of the following is not a pyrite ore?

A.Gypsum

B.Celestite

C.Galena

D.Siderite

Explanation: The correct answer is Siderite.

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Test piece for determination of RUL of a refractory is heated in a/an________?

A.Neutral atmosphere

B.Reducing atmosphere

C.Oxidising atmosphere

D.Electric furnace

Explanation: The correct answer is Electric furnace.

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Shortest distance between two tubes is________?

A.Called tube pitch

B.None of these

C.More in case of triangular pitch as compared to square pitch of tube layout

D.Called tube clearance

Explanation: The correct answer is Called tube clearance.

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Maximum thermal efficiency of boiler may be about ________ percent?

A.90

B.65

C.10

D.25

Explanation: The correct answer is 90.

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During the constant rate period of drying of a solid?

A.Increasing the air temperature decreases the drying rate

B.Increased air humidity decreases the rate of drying

C.None of these

D.Surface evaporation of unbound moisture occurs

Explanation: The correct answer is Surface evaporation of unbound moisture occurs.

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________ mill is not a revolving mill?

A.Pebble

B.Cage

C.Tube

D.Compartment

Explanation: The correct answer is Cage.

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Pressure of 0.01 psi (absolute) can be measured by ________ gauge?

A.Pirani

B.Ionisation

C.None of these

D.Mcleod

Explanation: The correct answer is Mcleod.

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Refluxing of part of the distillate in a fractionating column is a ‘recycling operation’, aimed primarily at________?

A.None of these

B.Product enrichment

C.Heat conservation

D.Yield enhancement

Explanation: The correct answer is Product enrichment.

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