MCQs

Chemical Engineering MCQs with Explanations

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3551Chemical EngineeringMedium

Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?

ANone of these

BDew point

CHumidity ratio

DWet bulb temperature

Correct answer

D. Wet bulb temperature

Explanation

The correct answer is Wet bulb temperature.

3552Chemical EngineeringMedium

Drying operation under vacuum is carried out to ________?

AIncrease drying temperature

BReduce drying temperature

CDry materials having high bound moisture content

DDry those materials which have very high unbound moisture content

Correct answer

B. Reduce drying temperature

Explanation

The correct answer is Reduce drying temperature.

3553Chemical EngineeringMedium

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture ________ calorimeter is not used for measuring the dryness fraction of steam?

ABucket

BBomb

CSeparating

DThrottling

Correct answer

B. Bomb

Explanation

The correct answer is Bomb.

3554Chemical EngineeringMedium

Low density polythene as compared to high density polythene is________?

AMore flexible

BHarder

CTougher

DChemically inert

Correct answer

A. More flexible

Explanation

The correct answer is More flexible.

3555Chemical EngineeringMedium

What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.)?

ANone of these

BTR/(T1 – TR) × (T1 – T2)/T1

CTR/(T2 – TR) × T1/(T1 – T2)

DTR/(T2 – TR) × (T1 – T2)/T1

Correct answer

D. TR/(T2 – TR) × (T1 – T2)/T1

Explanation

The correct answer is TR/(T2 – TR) × (T1 – T2)/T1.

3556Chemical EngineeringMedium

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is________?

ASherwood number

BSchmidt number

CStanton number

DNusselt number

Correct answer

B. Schmidt number

Explanation

The correct answer is Schmidt number.

3557Chemical EngineeringMedium

Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called________?

ARefractoriness

BNone of these

CRefractoriness under load (RUL)

DSpalling resistance

Correct answer

D. Spalling resistance

Explanation

The correct answer is Spalling resistance.

3558Chemical EngineeringMedium

The rate of solid-liquid extraction is limited by the________?

ADiffusion of the solute through the solvent in the pores to the outside of the particle

BDiffusion of the solute from the solution in contact with the particle to the main bulk of the

CAll A, B. & C.

DPhase change of the solute as it dissolves in the solvent

Correct answer

C. All A, B. & C.

Explanation

The correct answer is All A, B. & C..

3559Chemical EngineeringMedium

In drop forging process, the forging is done by dropping the ________ at high velocity?

ADie with hammer

BHammer

CWeight on hammer

DWorkpiece

Correct answer

A. Die with hammer

Explanation

The correct answer is Die with hammer.

3560Chemical EngineeringMedium

The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X)?

ACA = 1.2 CA0 (1 – X)/(1 – 0.33X)

BCA = 1.2 CA0 (1 – X)/(1 – 0.5X)

CCA = 0.83 CA0 (1 – X)/(1 – 0.5X)

DCA = 0.83 CA0 (1 – X)/(1 – 0.33X)

Correct answer

D. CA = 0.83 CA0 (1 – X)/(1 – 0.33X)

Explanation

The correct answer is CA = 0.83 CA0 (1 – X)/(1 – 0.33X).

The rate of solid-liquid extraction is limited by the________?

ADiffusion of the solute through the solvent in the pores to the outside of the particle

BDiffusion of the solute from the solution in contact with the particle to the main bulk of the

CAll A, B. & C.

DPhase change of the solute as it dissolves in the solvent

Correct answer

C. All A, B. & C.

Explanation

The correct answer is All A, B. & C..