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Chemical Engineering MCQs with Explanations

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311Chemical EngineeringMedium

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

ABaffle

BVent

CCatchall

DBleed point

Correct answer

C. Catchall

Explanation

The correct answer is Catchall.

312Chemical EngineeringMedium

Laser welding is widely employed in the ________ industries?

AElectronic

BStructural

CHeavy

DProcess

Correct answer

A. Electronic

Explanation

The correct answer is Electronic.

313Chemical EngineeringMedium

In a single evaporator system, the steam economy ________ by creating vacuum in the evaporator?

ADecreases

BRemain constant

CMay increase or decrease, depends on the vacuum

DIncreases

Correct answer

D. Increases

Explanation

The correct answer is Increases.

314Chemical EngineeringMedium

As the reflux ratio in a distillation column is increased from the minimum, the________?

ATotal cost first decreases and then increases

BSlope of the operating line in stripping section decreases

CNumber of plates decreases very slowly first and then more and more rapidly

DLiquid flow increases while the vapor flow decreases for a system

Correct answer

A. Total cost first decreases and then increases

Explanation

The correct answer is Total cost first decreases and then increases.

315Chemical EngineeringMedium

A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system is________?

Correct answer

A. 3

Explanation

The correct answer is 3.

316Chemical EngineeringMedium

Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on________?

ANone of these

BT1 – T2

CT2 – Ta

DT1 – Ta

Correct answer

A. None of these

Explanation

The correct answer is None of these.

317Chemical EngineeringMedium

________ is the most suitable fertilizer for paddy?

ASuperphosphate

BAmmonium sulphate

CUrea

DPotassium nitrate

Correct answer

B. Ammonium sulphate

Explanation

The correct answer is Ammonium sulphate.

318Chemical EngineeringMedium

Which of the following is not concerned with the heat transfer?

ASchmidt number

BPeclet number

CStanton number

DBrinkman number

Correct answer

A. Schmidt number

Explanation

The correct answer is Schmidt number.

319Chemical EngineeringMedium

A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to ________?

AGain a proton

BLose an electron

CNone of these

DLose a proton

Correct answer

D. Lose a proton

Explanation

The correct answer is Lose a proton.

320Chemical EngineeringMedium

Main use of hydrazine is________?

AAs a rocket fuel

BAs a disinfectant

CAs fire retardant

DIn water treatment

Correct answer

A. As a rocket fuel

Explanation

The correct answer is As a rocket fuel.

As the reflux ratio in a distillation column is increased from the minimum, the________?

ATotal cost first decreases and then increases

BSlope of the operating line in stripping section decreases

CNumber of plates decreases very slowly first and then more and more rapidly

DLiquid flow increases while the vapor flow decreases for a system

Correct answer

A. Total cost first decreases and then increases

Explanation

The correct answer is Total cost first decreases and then increases.