Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 168 of 557.

Chemical Engineering MCQs

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Free energy________?

A.Decreases in all spontaneous (or irreversible) processes

B.Remains unchanged in reversible processes carried at constant temperature and pressure

C.Change during a spontaneous process has a negative value

D.All A, B. and C

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

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40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is________?

A.1/3

B.1/4

C.2/3

D.1/2

Explanation: The correct answer is 1/3.

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In fluid flow, cavitation is caused, if the________?

A.Flow pressure approaches its vapor pressure at the prevailing temperature

B.Total energy decreases

C.Fluid velocity decreases to zero

D.Both A. and B.

Explanation: The correct answer is Flow pressure approaches its vapor pressure at the prevailing temperature.

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Specific speed of a centrifugal pump depends upon the ________ head?

A.Suction

B.None of these

C.Delivery

D.Manometric

Explanation: The correct answer is None of these.

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Which of the following is desirable in diesel and kerosene but is undesirable in gasoline?

A.Naphthenic acid

B.Mercaptans

C.Aromatics

D.Paraffins

Explanation: The correct answer is Aromatics.

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Which of the following has the minimum value of COP for a given refrigeration effect?

A.Vapour-compression process with a reversible expansion engine

B.Reverse Carnot cycle

C.Ordinary vapour-compression cycle

D.Air refrigeration cycle

Explanation: The correct answer is Air refrigeration cycle.

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For grinding of softer materials, the grinding wheel should have ________ grain size?

A.Finer

B.Any type of

C.Medium

D.Coarser

Explanation: The correct answer is Coarser.

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The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D________?

A.T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp

B.T1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp

C.T1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp

D.T1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp

Explanation: The correct answer is T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp.

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With increase in temperature, the leaching rate increases due to________?

A.Both A. and B.

B.Neither A. nor B.

C.Decreased liquid viscosity

D.Increased diffusivity

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

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Lead is poured into the joint between two ________ pipes?

A.Concrete

B.Mild steel

C.Asbestos cement

D.Cast iron

Explanation: The correct answer is Cast iron.

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Pick out the wrong statement about the recycle stream in a process?

A.Recycling is exemplified by refluxing back a part of the distillate to the distillation column to

B.Recycling in a process stream helps in utilising the valuable reactants to the maximum with

C.The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the

D.Recycling in a process does not help in getting higher extent of reaction

Explanation: The correct answer is Recycling in a process does not help in getting higher extent of reaction.

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Mach number is important in a fluid flow problem, when the inertia and ________ forces predominate?

A.None of these

B.Elastic

C.Viscous

D.Gravity

Explanation: The correct answer is Elastic.

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Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as________?

A.Δp = G2

B.Δp = G

C.Δp = G0.5

D.Δp = 1/G0.6

Explanation: The correct answer is Δp = G2.

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In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is________?

A.Terylene

B.Polypropylene

C.PVC

D.Polybutadiene

Explanation: The correct answer is Terylene.

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Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to________?

A.Slag attack

B.Fusion under load

C.CO attack

D.Thermal spalling

Explanation: The correct answer is Thermal spalling.

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