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Chemical Engineering MCQs with Explanations

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231Chemical EngineeringMedium

Fireclay bricks are used in the________?

AChimney linings

BFlues

CAll A., B. and C.

DFurnaces allowed to cool frequently

Correct answer

C. All A., B. and C.

Explanation

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

232Chemical EngineeringMedium

A photochemical reaction is ________?

AAll A., B. & C.

BAccompanied with emission of light

CInitiated by light

DCatalysed by light

Correct answer

C. Initiated by light

Explanation

The correct answer is Initiated by light.

233Chemical EngineeringMedium

Size reduction does not occur due to compression in case of________?

ARod mills

BSmooth roll crushers

CJaw crushers

DGyratory crushers

Correct answer

A. Rod mills

Explanation

The correct answer is Rod mills.

234Chemical EngineeringMedium

When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is ________ distillation?

ANone of these

BAzeotropic

CContinuous

DSteam

Correct answer

D. Steam

Explanation

The correct answer is Steam.

235Chemical EngineeringMedium

Minimum possible diameter of a packed column is decided mainly by the________?

ALiquid hold up

BFlooding

CLiquid density

DGas viscosity

Correct answer

B. Flooding

Explanation

The correct answer is Flooding.

236Chemical EngineeringMedium

Pick out the wrong statement pertaining to the design of the distillation column?

ANone of these

BIf sufficient slot area is not provided, the gas may pass through the skirt clearance

CGenerally, a skirt clearance of 0.5′′ to 1.5′ is recommended to prevent plugging of the slots by

DThe purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

Correct answer

A. None of these

Explanation

The correct answer is None of these.

237Chemical EngineeringMedium

At ________ point, all the three phases (i.e. solid, liquid and gas) co-exist?

ACritical

BEutectic

CPlait

DTriple

Correct answer

D. Triple

Explanation

The correct answer is Triple.

238Chemical EngineeringMedium

In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called ________ is produced?

AMiddling

BNone of these

CTailing

DConcentrate

Correct answer

A. Middling

Explanation

The correct answer is Middling.

239Chemical EngineeringMedium

Which of the following combustibles is absent in blast furnace gas?

ANone of these

BCO

CH2

DCH4

Correct answer

D. CH4

Explanation

The correct answer is CH4.

240Chemical EngineeringMedium

In case of a desorber (stripper), the________?

ATemperature always increases

BOperating line always lies below the equilibrium curve

CTemperature remains unaffected

DOperating line always lies above the equilibrium curve

Correct answer

B. Operating line always lies below the equilibrium curve

Explanation

The correct answer is Operating line always lies below the equilibrium curve.

Pick out the wrong statement pertaining to the design of the distillation column?

ANone of these

BIf sufficient slot area is not provided, the gas may pass through the skirt clearance

CGenerally, a skirt clearance of 0.5′′ to 1.5′ is recommended to prevent plugging of the slots by

DThe purpose of the slot is to disperse the gas into the liquid in the form of small bubbles

Correct answer

A. None of these

Explanation

The correct answer is None of these.

In case of a desorber (stripper), the________?

ATemperature always increases

BOperating line always lies below the equilibrium curve

CTemperature remains unaffected

DOperating line always lies above the equilibrium curve

Correct answer

B. Operating line always lies below the equilibrium curve

Explanation

The correct answer is Operating line always lies below the equilibrium curve.