Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 270 of 557.

Chemical Engineering MCQs

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Dead zone is the________?

A.None of these

B.Maximum change in the variable that does not change the reading of the instrument

C.Same as time constant

D.Same as transportation lag

Explanation: The correct answer is Maximum change in the variable that does not change the reading of the instrument.

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A large iceberg melts at the base, but not at the top, because of the reason that________?

A.The iceberg remains in a warmer condition at the base

B.All A, B. and C

C.Ice at the base contains impurities which lowers its melting point

D.Due to the high pressure at the base, its melting point reduces

Explanation: The correct answer is Due to the high pressure at the base, its melting point reduces.

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Transition length for turbulent flow in smooth pipe is equal to ________ times the pipe diameter?

A.50

B.500

C.0.5

D.5

Explanation: The correct answer is 50.

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Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around ________ atm?

A.25-30

B.3-5

C.60-65

D.95-100

Explanation: The correct answer is 25-30.

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The highest melting pure oxide (m.p. > 3000°C)is________?

A.Beryllia

B.Alumina

C.Thoria

D.Zirconia

Explanation: The correct answer is Thoria.

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Nitrolime is________?

A.Calcium ammonium nitrate

B.Calcium nitrate

C.A mixture of nitric acid and lime

D.A mixture of ammonium nitrate and calcium nitrate

Explanation: The correct answer is Calcium ammonium nitrate.

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If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will ________?

A.Increase nine fold

B.Remain unaltered

C.Decrease three fold

D.Increase three fold

Explanation: The correct answer is Increase nine fold.

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Thermal equivalent of electrical power in practical calculation is ________ kcal/kWh?

A.746

B.3000

C.550

D.1000

Explanation: The correct answer is 3000.

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Which of the following constituents of coal is the most important in the production of coke?

A.Volatiles

B.Moisture

C.Carbon

D.Ash

Explanation: The correct answer is Carbon.

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The dew point of an unsaturated gas-vapor mixture does not depend upon the ________ of the mixture?

A.All A., B. and C.

B.Composition

C.Total pressure

D.Temperature

Explanation: The correct answer is Temperature.

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Bernoulli‟s equation does not apply to the functioning of a/an________?

A.Venturimeter

B.None of these

C.pitot tube

D.Orificemeter

Explanation: The correct answer is None of these.

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In parallel pipe problems, the________?

A.None of these

B.Discharge is the same through all the pipes

C.Head loss is the same through each pipe

D.Total head loss is equal to the sum of the head losses through each pipe

Explanation: The correct answer is Head loss is the same through each pipe.

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Which of the following is not a colligative property?

A.Depression of freezing point

B.Osmotic pressure

C.None of these

D.Lowering of vapor pressure

Explanation: The correct answer is None of these.

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Lower wall courses of soaking pits are made of ________ bricks to avoid the action of molten slag & scale?

A.Silicon carbide

B.Chrome or magnesite

C.Low duty fireclay

D.Silica

Explanation: The correct answer is Chrome or magnesite.

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Which of the following would require maximum amount of % excess air for complete combustion?

A.Lump coal (fixed on chain grate)

B.Furnace oil

C.Pulverised coal

D.Coke oven gas

Explanation: The correct answer is Lump coal (fixed on chain grate).

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