MCQs

Chemical Engineering MCQs with Explanations

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631Chemical EngineeringMedium

Radiation pyrometers as compared to thermocouples________?

AHas a slower speed of response

BCan’t measure the temperature of moving objects

CCan measure higher temperature

DIs more affected by corrosive atmosphere

Correct answer

C. Can measure higher temperature

Explanation

The correct answer is Can measure higher temperature.

632Chemical EngineeringMedium

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ________?

At = 356 s

Bt = 400 s

Ct = 800 s

Dt = 283 s

Correct answer

C. t = 800 s

Explanation

The correct answer is t = 800 s.

633Chemical EngineeringMedium

Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method?

ATotal condenser

BReboiler

CPartial condenser

DBoth B. and C

Correct answer

D. Both B. and C

Explanation

The correct answer is Both B. and C.

634Chemical EngineeringMedium

Linde gas liquefaction process employs cooling ________?

ABy throttling

BNone of these

CBy expansion in an engine

DAt constant pressure

Correct answer

A. By throttling

Explanation

The correct answer is By throttling.

635Chemical EngineeringMedium

The range of electromagnetic spectrum important in heat transfer by radiation is ________ microns?

A100-1000

B0.5-50

C0.38-0.78

D5-50

Correct answer

B. 0.5-50

Explanation

The correct answer is 0.5-50.

636Chemical EngineeringMedium

Good quality kerosene should have________?

ALow smoke point

BHigh aromatics content

CLow paraffins content

DHigh smoke point

Correct answer

D. High smoke point

Explanation

The correct answer is High smoke point.

637Chemical EngineeringMedium

L.D. converter is used in the production of________?

APig iron

BZinc

CSteel

DCopper

Correct answer

C. Steel

Explanation

The correct answer is Steel.

638Chemical EngineeringMedium

Catalyst used in the catalytic polymerisation is________?

ANickel

BAluminium chloride

CVanadium pentoxide

DPhosphoric acid on kieselguhr

Correct answer

D. Phosphoric acid on kieselguhr

Explanation

The correct answer is Phosphoric acid on kieselguhr.

639Chemical EngineeringMedium

Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________?

AC = P – F + 2

BP + F – C = 2

CF = C – P – 2

Correct answer

B. P + F – C = 2

Explanation

The correct answer is P + F – C = 2.

640Chemical EngineeringMedium

The product obtained on mixing calcium oxide with water is called ________?

ASlaked lime

BQuicklime

CNone of these

DMilk of lime

Correct answer

A. Slaked lime

Explanation

The correct answer is Slaked lime.

631Chemical EngineeringMedium

Radiation pyrometers as compared to thermocouples________?

AHas a slower speed of response

BCan’t measure the temperature of moving objects

CCan measure higher temperature

DIs more affected by corrosive atmosphere

Correct answer

C. Can measure higher temperature

Explanation

The correct answer is Can measure higher temperature.

632Chemical EngineeringMedium

A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time ________?

At = 356 s

Bt = 400 s

Ct = 800 s

Dt = 283 s

Correct answer

C. t = 800 s

Explanation

The correct answer is t = 800 s.

633Chemical EngineeringMedium

Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method?

ATotal condenser

BReboiler

CPartial condenser

DBoth B. and C

Correct answer

D. Both B. and C

Explanation

The correct answer is Both B. and C.

634Chemical EngineeringMedium

Linde gas liquefaction process employs cooling ________?

ABy throttling

BNone of these

CBy expansion in an engine

DAt constant pressure

Correct answer

A. By throttling

Explanation

The correct answer is By throttling.

635Chemical EngineeringMedium

The range of electromagnetic spectrum important in heat transfer by radiation is ________ microns?

A100-1000

B0.5-50

C0.38-0.78

D5-50

Correct answer

B. 0.5-50

Explanation

The correct answer is 0.5-50.

636Chemical EngineeringMedium

Good quality kerosene should have________?

ALow smoke point

BHigh aromatics content

CLow paraffins content

DHigh smoke point

Correct answer

D. High smoke point

Explanation

The correct answer is High smoke point.

637Chemical EngineeringMedium

L.D. converter is used in the production of________?

APig iron

BZinc

CSteel

DCopper

Correct answer

C. Steel

Explanation

The correct answer is Steel.

638Chemical EngineeringMedium

Catalyst used in the catalytic polymerisation is________?

ANickel

BAluminium chloride

CVanadium pentoxide

DPhosphoric acid on kieselguhr

Correct answer

D. Phosphoric acid on kieselguhr

Explanation

The correct answer is Phosphoric acid on kieselguhr.

639Chemical EngineeringMedium

Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as________?

AC = P – F + 2

BP + F – C = 2

CF = C – P – 2

Correct answer

B. P + F – C = 2

Explanation

The correct answer is P + F – C = 2.

640Chemical EngineeringMedium

The product obtained on mixing calcium oxide with water is called ________?

ASlaked lime

BQuicklime

CNone of these

DMilk of lime

Correct answer

A. Slaked lime

Explanation

The correct answer is Slaked lime.