Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 79 of 557.

Chemical Engineering MCQs

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A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________?

A.U and S both decreases

B.U decreases but S is constant

C.U is constant but S decreases

D.its internal energy (U) decreases and its entropy (S) increases

Explanation: The correct answer is U and S both decreases.

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Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is________?

A.0.58

B.0.5

C.0.2

D.1.72

Explanation: The correct answer is 0.58.

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Boundary layer separation is caused by the ________?

A.Reduction of pressure gradient to zero

B.Adverse pressure gradient

C.Reduction of boundary layer thickness to zero

D.Reduction of pressure below vapour pressure

Explanation: The correct answer is Adverse pressure gradient.

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Cavitation occurs in a centrifugal pump when the suction pressure is________?

A.Greater than the vapour pressure of the liquid at that temperature

B.Equal to the vapour pressure

C.Less than the vapour pressure of the liquid at that temperature

D.Equal to the developed head

Explanation: The correct answer is Less than the vapour pressure of the liquid at that temperature.

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Change of state namely evaporation condensation, freezing and melting is an ________ process?

A.Isothermal

B.Adiabatic

C.Isochoric

D.Isobaric

Explanation: The correct answer is Isothermal.

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Which of the following can measure temperatures in the range of – 20 to 300°C?

A.Vapor pressure thermometer

B.Resistance thermometer

C.None of these

D.Mercury in glass thermometer

Explanation: The correct answer is None of these.

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Chemical name of Grignard reagent is________?

A.Sodium sulphite

B.Sodium bicarbonate

C.Sodium thiosulphate

D.Ethyl magnesium chloride

Explanation: The correct answer is Ethyl magnesium chloride.

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Limestone is added in the blast furnace (during pig iron manufacture) to________?

A.Reduce slag viscosity

B.Supply heat by undergoing exothermic reaction with impurities

C.Reduce the coke consumption

D.Form slag by combining with impurities

Explanation: The correct answer is Form slag by combining with impurities.

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Which of the following processes consumes hydrogen?

A.Visbreaking

B.Fluid catalytic cracking

C.None of these

D.Propane deasphalting

Explanation: The correct answer is Fluid catalytic cracking.

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________ paper is used in the manufacture of newsprint paper?

A.Wrapping

B.Ground-wood

C.Tissue

D.Board

Explanation: The correct answer is Ground-wood.

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Pick out the wrong statement?

A.Operating principles of Dodge and Blake jaw crushers are combined in the working of

B.Cutting machines mainly employ ‘attrition’ for size reduction of solids

C.There are only four methods namely compression, impact, attrition and cutting, which the size

D.More commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the

Explanation: The correct answer is Cutting machines mainly employ ‘attrition’ for size reduction of solids.

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Firing temperature of magnesite bricks is about ________ °C?

A.2400-2600

B.1000-1200

C.1600-1800

D.800-1000

Explanation: The correct answer is 1600-1800.

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Absorption factor method is used to calculate the number of ideal stages, when________?

A.Operating line lies below the equilibrium line

B.Both operating and equilibrium lines are parallel

C.Pressure drop in the column is very high

D.Operating line lies above the equilibrium line

Explanation: The correct answer is Both operating and equilibrium lines are parallel.

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The reaction A + B → C has been conducted in a reactor as shown below. The numbers of balances (material) that can be made around the reactor are________?

A.3

B.4

C.2

D.1

Explanation: The correct answer is 3.

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Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled________?

A.And dehumidified with increase in wet bulb temperature

B.At the same relative humidity

C.And dehumidified with decrease in wet bulb temperature

D.And humidified

Explanation: The correct answer is And dehumidified with decrease in wet bulb temperature.

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