Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 152 of 557.

Chemical Engineering MCQs

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Mode of heat transfer involved in the cooling of air cooled internal combustion engine is________?

A.Natural convection

B.Forced convection

C.None of these

D.Conduction

Explanation: The correct answer is Natural convection.

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In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because________?

A.Water forms an acid mist, which is difficult to absorb

B.The purity of acid is affected

C.SO3 gas is sparingly soluble in water

D.Scale formation in the absorber is to be avoided

Explanation: The correct answer is Water forms an acid mist, which is difficult to absorb.

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For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the ________ filter?

A.Rotary vacuum

B.Plate & frame

C.Sand

D.Shell & leaf

Explanation: The correct answer is Sand.

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Tube pitch is the ________ of tube diameters and the clearances?

A.Difference

B.Ratio

C.Sum

D.None of these

Explanation: The correct answer is Sum.

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In a good rimming steel________?

A.Silicon should be low but carbon should be high

B.Silicon should be high but carbon should be low

C.Both silicon & carbon should be high

D.Carbon and silicon should be low

Explanation: The correct answer is Carbon and silicon should be low.

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Drills are usually made of________?

A.Tungsten carbide

B.High speed steel

C.Alloy steel

D.Cermets

Explanation: The correct answer is High speed steel.

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Hydrofining is the most recent and effective method for the________?

A.Removal of sulphur

B.Improvement of smoke point

C.Improvement of viscosity index

D.Reduction of breathing loss

Explanation: The correct answer is Removal of sulphur.

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High refractoriness of refractory bricks means, that it has a________?

A.Low spalling resistance

B.High resistance to fusion

C.Low porosity

D.High spalling resistance

Explanation: The correct answer is High resistance to fusion.

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A high vapour velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about ________ percent of the flooding velocity?

A.45

B.60

C.95

D.80

Explanation: The correct answer is 80.

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At constant temperature, the thermal conductivities of gases ________ with rise in pressure?

A.May increase or decrease; depends on the pressure

B.Decrease

C.Remain unchanged

D.Increase

Explanation: The correct answer is Decrease.

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Which is the most efficient absorbent for SO3 out of the following?

A.78% H2SO4

B.98% H2SO4

C.20% oleum

D.65% oleum

Explanation: The correct answer is 98% H2SO4.

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Sweetening of petroleum product means the removal of ________?

A.Organic impurities

B.Wax

C.Sulphur & its compounds

D.Water

Explanation: The correct answer is Sulphur & its compounds.

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An annuity is a series of equal payments occuring at equal time intervals, and this amount includes the sum of all payments plus interest, if allowed to accumulate at a definite rate of interest from the time of initial payment to the end of annuity term. Ordinary annuity is used in the calculation of the________?

A.Cash ratio

B.Discrete compound interest

C.Manufacturing cost

D.Depreciation by sinking fund method

Explanation: The correct answer is Depreciation by sinking fund method.

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Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of________?

A.Methanol

B.Trichloroethylene

C.Parathion

D.Perchloroethylene

Explanation: The correct answer is Perchloroethylene.

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The film thickness for laminar film condensation on vertical surface ________ from top to bottom?

A.Cumulatively decreases

B.Remain constant

C.And the surface conductance increase

D.Cumulatively increases

Explanation: The correct answer is Cumulatively increases.

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