MCQs

Chemical Engineering MCQs with Explanations

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3141Chemical EngineeringMedium

Anion exchanger is regenerated usually with ________?

AHydrazine

BH2SO4

CAlum solution

DNaOH

Correct answer

D. NaOH

Explanation

The correct answer is NaOH.

3142Chemical EngineeringMedium

A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?

ADrag, gravitational and buoyancy forces are important

BDrag force and gravitational forces are important

CNone of the above

DInertial and drag forces are important

Correct answer

A. Drag, gravitational and buoyancy forces are important

Explanation

The correct answer is Drag, gravitational and buoyancy forces are important.

3143Chemical EngineeringMedium

Coke ovens in steel plant are heated by________?

AElectricity

BBoth B. and C.

CCoke oven gas

DBlast furnace gas/mixed gas

Correct answer

B. Both B. and C.

Explanation

The correct answer is Both B. and C..

3144Chemical EngineeringMedium

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)?

A√y

B1/√P

C√T

D1/√ρ

Correct answer

B. 1/√P

Explanation

The correct answer is 1/√P.

3145Chemical EngineeringMedium

Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ________?

AIron-constantan

BPlatinum-rhodium

CPlatinum-platinum + rhodium

DChromel-alumel

Correct answer

A. Iron-constantan

Explanation

The correct answer is Iron-constantan.

3146Chemical EngineeringMedium

Bode stability method uses ________ loop transfer function?

AClosed

BEither A. or B.

COpen

DNeither A. nor B.

Correct answer

C. Open

Explanation

The correct answer is Open.

3147Chemical EngineeringMedium

Tempering of steel is done to make it________?

AHard

BSoft

CBrittle

DRollable

Correct answer

B. Soft

Explanation

The correct answer is Soft.

3148Chemical EngineeringMedium

A machine has an initial value of Rs. 5000, service life of 5 years and final salvage value of Rs. 1000. The annual depreciation cost by straight line method is Rs________?

A600

B800

C1000

D300

Correct answer

B. 800

Explanation

The correct answer is 800.

3149Chemical EngineeringMedium

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are?

Correct answer

D. 2

Explanation

The correct answer is 2.

3150Chemical EngineeringMedium

The absorptivity of a body is equal to its emissivity ________?

AAt a particular temperature

BUnder thermal equilibrium

CNone of these

DFor circular bodies

Correct answer

B. Under thermal equilibrium

Explanation

The correct answer is Under thermal equilibrium.

A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation?

ADrag, gravitational and buoyancy forces are important

BDrag force and gravitational forces are important

CNone of the above

DInertial and drag forces are important

Correct answer

A. Drag, gravitational and buoyancy forces are important

Explanation

The correct answer is Drag, gravitational and buoyancy forces are important.