MCQs

Chemical Engineering MCQs with Explanations

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3701Chemical EngineeringMedium

Air-refrigeration cycle________?

AIs the most efficient of all refrigeration cycles

BRequires relatively large quantities of air to achieve a significant amount of refrigeration

CHas very low efficiency

DBoth B. and C

Correct answer

D. Both B. and C

Explanation

The correct answer is Both B. and C.

3702Chemical EngineeringMedium

A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by________?

Akeff = k + kg

Bkeff = (kkg)1/2

Ckeff = (k+ kg)/2

D1/keff = 1/k + 1/kg

Correct answer

D. 1/keff = 1/k + 1/kg

Explanation

The correct answer is 1/keff = 1/k + 1/kg.

3703Chemical EngineeringMedium

Thermal diffusivity is the most important in heat transfer by________?

AConduction

BRadiation

CNatural convection

DCondensation

Correct answer

A. Conduction

Explanation

The correct answer is Conduction.

3704Chemical EngineeringMedium

Nickel is a constituent of ________?

ADuralumin

BBronze

CSolder

DMonel metal

Correct answer

D. Monel metal

Explanation

The correct answer is Monel metal.

3705Chemical EngineeringMedium

Which of the following has the highest thermal conductivity?

ABrick

BSilver

CWater

DAir

Correct answer

B. Silver

Explanation

The correct answer is Silver.

3706Chemical EngineeringMedium

The grinding in a hammer crusher takes place due to the________?

AAttrition

BNeither A. nor B.

CImpact

DBoth A. & B.

Correct answer

D. Both A. & B.

Explanation

The correct answer is Both A. & B..

3707Chemical EngineeringMedium

Fluid resistance to shear depends upon its________?

ARate of transfer of molecular momentum

BNeither A. nor B.

CBoth A. and B.

DCohesion

Correct answer

C. Both A. and B.

Explanation

The correct answer is Both A. and B..

3708Chemical EngineeringMedium

During size reduction by a jaw crusher, the energy consumed decreases with the________?

ANone of these

BDecreasing size of product at constant size of feed

CIncreasing size of feed at constant reduction ratio

DDecreasing machine capacity

Correct answer

C. Increasing size of feed at constant reduction ratio

Explanation

The correct answer is Increasing size of feed at constant reduction ratio.

3709Chemical EngineeringMedium

In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is________?

AIncreased with decrease in pressure

BUnchanged with pressure changes

CIndependent of temperature

DIncreases with rise in pressure

Correct answer

D. Increases with rise in pressure

Explanation

The correct answer is Increases with rise in pressure.

3710Chemical EngineeringMedium

If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is________?

AL/G

BNone of these

CAlways < 1

DG/L

Correct answer

A. L/G

Explanation

The correct answer is L/G.

During size reduction by a jaw crusher, the energy consumed decreases with the________?

ANone of these

BDecreasing size of product at constant size of feed

CIncreasing size of feed at constant reduction ratio

DDecreasing machine capacity

Correct answer

C. Increasing size of feed at constant reduction ratio

Explanation

The correct answer is Increasing size of feed at constant reduction ratio.