MCQs

Chemical Engineering MCQs with Explanations

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581Chemical EngineeringMedium

If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to________?

Af1/2

B2f1

C4f2

Df1/4

Correct answer

D. f1/4

Explanation

The correct answer is f1/4.

582Chemical EngineeringMedium

Short/intense flame is produced during combustion of gaseous fuel by using________?

APreheated secondary air

BVery little excess air

CHigh amount/current of combustion air

DLow amount/current of combustion air

Correct answer

C. High amount/current of combustion air

Explanation

The correct answer is High amount/current of combustion air.

583Chemical EngineeringMedium

Spalling resistance of a refractory cannot be increased by ________?

AMaking it denser

BDecreasing its thermal co-efficient of expansion

CIncreasing its porosity

DUsing a coarser grog during its manufacture

Correct answer

A. Making it denser

Explanation

The correct answer is Making it denser.

584Chemical EngineeringMedium

Pick out the wrong statement pertaining to ‘green house’ for the plants?

AThe emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed

B‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

C‘Green house’ is colder than the outside atmosphere

D‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where

Correct answer

C. ‘Green house’ is colder than the outside atmosphere

Explanation

The correct answer is ‘Green house’ is colder than the outside atmosphere.

585Chemical EngineeringMedium

Presence of even 0.005% of ________ in copper makes it highly brittle, rendering it useless for wire-drawing?

AArsenic

BAntimony

CBismuth

DOxygen

Correct answer

C. Bismuth

Explanation

The correct answer is Bismuth.

586Chemical EngineeringMedium

Which of the following has the lowest cetane number?

ANaphthene

BOlefins

CAromatics

Di-paraffins

Correct answer

C. Aromatics

Explanation

The correct answer is Aromatics.

587Chemical EngineeringMedium

Hole diameter of the sieve trays in the distillation column ranges from ________ mm?

A4 to 8

B12.5 to 18.5

C1 to3

D3 to 12.5

Correct answer

D. 3 to 12.5

Explanation

The correct answer is 3 to 12.5.

588Chemical EngineeringMedium

In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following ________?

ABlast of air

BMixture of water and air

CRain of molten lead

DJet of water at high pressure

Correct answer

C. Rain of molten lead

Explanation

The correct answer is Rain of molten lead.

589Chemical EngineeringMedium

The specific cake resistance for compressible sludges is a function of the pressure drop________?

ANone of these

BOver medium

COver cake

DOverall

Correct answer

C. Over cake

Explanation

The correct answer is Over cake.

590Chemical EngineeringMedium

Deficiency of combustion air during combustion of a gaseous fuel________?

ALengthens the flame

BCauses heat loss of fuel by its partial combustion

CShortens the flame

DBoth A. & B.

Correct answer

D. Both A. & B.

Explanation

The correct answer is Both A. & B..

Pick out the wrong statement pertaining to ‘green house’ for the plants?

AThe emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed

B‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

C‘Green house’ is colder than the outside atmosphere

D‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where

Correct answer

C. ‘Green house’ is colder than the outside atmosphere

Explanation

The correct answer is ‘Green house’ is colder than the outside atmosphere.