Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 128 of 557.

Chemical Engineering MCQs

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In case of design of a shell and tube heat exchanger________?

A.Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto

B.Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

C.All A., B. & C.

D.O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

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

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The vapor pressure of liquids of similar chemical nature at any particular temperature ________ with increase in the molecular weight?

A.Decreases

B.Either A. or B.; depends on the liquid

C.Increases

D.Remains unchanged

Explanation: The correct answer is Decreases.

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Bernoulli’s equation is dependent on the________?

A.Third law of thermodynamics

B.None of these

C.Law of conservation of momentum

D.First law of thermodynamics

Explanation: The correct answer is None of these.

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Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

A.Titanium

B.Aluminium brass

C.Stainless steel

D.Admiralty brass

Explanation: The correct answer is Stainless steel.

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Chalcopyrite is the main ore of________?

A.Copper

B.Tin

C.Lead

D.Iron

Explanation: The correct answer is Copper.

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Weber number is significant and is concerned with the________?

A.Liquid-liquid mixing

B.Dispersion of liquid in liquid

C.Suspension of solid in liquid

D.Solid-liquid mixing

Explanation: The correct answer is Dispersion of liquid in liquid.

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For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because________?

A.Lewis number is close to unity

B.They are always equal under all circumstances

C.Solubility of the components of air in water is very small

D.Water has a high latent heat of evaporation

Explanation: The correct answer is Water has a high latent heat of evaporation.

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What is the value of ln y (where y = activity co-efficient) for ideal gases?

A.Unity

B.Negative

C.Infinity

D.Zero

Explanation: The correct answer is Zero.

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Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number?

A.f-0.5 = 4.07 loge (NRef)-0.6

B.f = 0.079.NRe-0.25

C.None of these

D.Both ‘a’ and ‘b’

Explanation: The correct answer is f = 0.079.NRe-0.25.

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A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when________?

A.CPA > CPB

B.kA >2 kB

C.kA < 0.5 kB

Explanation: The correct answer is kA < 0.5 kB.

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Atomising steam to fuel oil ratio in a burner should be around________?

A.3.5

B.2.5

C.1.5

D.0.5

Explanation: The correct answer is 0.5.

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Cast iron has very high________?

A.Compressive strength

B.Shock resistance

C.Resistance to brittleness

D.Ductility

Explanation: The correct answer is Compressive strength.

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Atoms with same number of neutrons, but different number of nucleons are called________?

A.Isotones

B.Isostere

C.Isotopes

D.Isobars

Explanation: The correct answer is Isotones.

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Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan________?

A.With greater number of blades

B.Of increased diameter

C.Neither A. nor B.

D.Both A. & B.

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

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For an input forcing function, X(t) = 2t2, the Laplace transform of this function is________?

A.4/s3

B.2/s3

C.2/s2

D.4/s2

Explanation: The correct answer is 4/s3.

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