Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 234 of 557.

Chemical Engineering MCQs

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Time constant is the ________?

A.Time taken by the controlled variable to reach 63.2% of its full change

B.Same as dead time

C.Same as transportation lag

D.Time required by the measured variable to reach 63.2% of its ultimate change

Explanation: The correct answer is Time taken by the controlled variable to reach 63.2% of its full change.

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The pressure sensing element of elastic type pressure gauge is never made in the form of a________?

A.Strip

B.Diaphragm

C.Bellow

D.Bourdon tube

Explanation: The correct answer is Strip.

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Out of the following, copper vessels are the most suitable for the storage of________?

A.Nitric acid (95% and fuming)

B.Bromine

C.Dry chlorine & dry fluorine

D.Phosphoric acid (95%) & sulphuric acid (95% and fuming)

Explanation: The correct answer is Dry chlorine & dry fluorine.

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Dry air requirement for burning 1 Nm3 of CO to CO2 may be around ________ Nm3?

A.1.75

B.2.4

C.11.4

D.0.87

Explanation: The correct answer is 2.4.

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Which is the most matured coal?

A.Anthracite

B.Semi-anthracite

C.Bituminous

D.Lignite

Explanation: The correct answer is Anthracite.

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Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and________?

A.Graphite and moving mercury

B.Moving mercury and crimped steel wire

C.Moving mercury and carbon

D.Moving mercury and graphite

Explanation: The correct answer is Graphite and moving mercury.

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In a manufacturing industry, breakeven point occurs, when the________?

A.Annual sales equals the fixed cost

B.Annual profit equals the expected value

C.Total annual rate of production equals the assigned value

D.Total annual product cost equals the total annual sales

Explanation: The correct answer is Total annual product cost equals the total annual sales.

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A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________?

A.Global warming

B.Atmospheric effect

C.Ionosphere

D.Green house

Explanation: The correct answer is Green house.

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Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the________?

A.Total pressure

B.Temperature of the liquid

C.Nature of the gas

D.Nature of the liquid

Explanation: The correct answer is Nature of the gas.

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A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is________?

A.5 m/sec

B.20 m/sec

C.10 m/sec

D.5 √2 m/sec

Explanation: The correct answer is 10 m/sec.

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Tar is a better fuel than furnace oil, because of its________?

A.Higher calorific value

B.Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate

C.Both A. and B.

D.Lower sulphur content

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

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Sodium ________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

A.Carbonate (monohydrate)

B.Bisulphite

C.Thiosulphate

D.Chloride

Explanation: The correct answer is Carbonate (monohydrate).

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In case of a ________ reactor, the composition in the reactor and at the exit of the reactor is the same?

A.Batch

B.Back-mix

C.Tubular

D.Semi-batch

Explanation: The correct answer is Back-mix.

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What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir?

A.Pressure pipeline

B.Tunnel

C.Penstock

D.Siphon

Explanation: The correct answer is Siphon.

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Which of the following operations does not involve leaching?

A.Dissolving pharmaceutical products from bark or roots

B.Dissolving sugar from the cells of the beet

C.Removing nicotine from its water solution by kerosene

D.Dissolving gold from ores

Explanation: The correct answer is Removing nicotine from its water solution by kerosene.

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