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Chemical Engineering MCQs with Explanations

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271Chemical EngineeringMedium

Pick out the wrong unit conversion of calorific value?

A1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

B1 BTU/lb = 2.3 kcal/kg

C1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

D1 kcal/m3 = 0.1124 BTU/ft3

Correct answer

B. 1 BTU/lb = 2.3 kcal/kg

Explanation

The correct answer is 1 BTU/lb = 2.3 kcal/kg.

272Chemical EngineeringMedium

What is the value of ln y (where y = activity co-efficient) for ideal gases?

AUnity

BNegative

CInfinity

DZero

Correct answer

D. Zero

Explanation

The correct answer is Zero.

273Chemical EngineeringMedium

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s)?

A24

B0.24

C24000

D0.44

Correct answer

D. 0.44

Explanation

The correct answer is 0.44.

274Chemical EngineeringMedium

Penetration test determines the ________ of the grease?

AService temperature

BVariation in viscosity with temperature

CStiffness

DLubricating properties (e.g. oilness)

Correct answer

C. Stiffness

Explanation

The correct answer is Stiffness.

275Chemical EngineeringMedium

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ________ times, when the number of tube passes is increased to 8?

A40.8

B40.4

C20.4

D20.8

Correct answer

A. 40.8

Explanation

The correct answer is 40.8.

276Chemical EngineeringMedium

Mild steel is a/an ________ steel?

AHigh alloy

BMedium carbon

CLow carbon

DHigh carbon

Correct answer

C. Low carbon

Explanation

The correct answer is Low carbon.

277Chemical EngineeringMedium

A fire tube boiler is limited to a maximum steam pressure of about ________ kg/cm2?

A38

B18

C52

Correct answer

B. 18

Explanation

The correct answer is 18.

278Chemical EngineeringMedium

Chemical reaction rate of a component depends upon the________?

APressure of the system

BAll A., B. and C.

CTemperature of the system

DComposition of the component only

Correct answer

B. All A., B. and C.

Explanation

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

279Chemical EngineeringMedium

A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?

AIII, II, I

BI, II, III

CII, III, I

DIII, I, II

Correct answer

A. III, II, I

Explanation

The correct answer is III, II, I.

280Chemical EngineeringMedium

Trinitrotoluene (TNT), an explosive, is made by the nitration of ________?

ANitrobenzene

BToluene

CBenzene

DNitrotoluene

Correct answer

B. Toluene

Explanation

The correct answer is Toluene.

271Chemical EngineeringMedium

Pick out the wrong unit conversion of calorific value?

A1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

B1 BTU/lb = 2.3 kcal/kg

C1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3

D1 kcal/m3 = 0.1124 BTU/ft3

Correct answer

B. 1 BTU/lb = 2.3 kcal/kg

Explanation

The correct answer is 1 BTU/lb = 2.3 kcal/kg.

272Chemical EngineeringMedium

What is the value of ln y (where y = activity co-efficient) for ideal gases?

AUnity

BNegative

CInfinity

DZero

Correct answer

D. Zero

Explanation

The correct answer is Zero.

273Chemical EngineeringMedium

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s)?

A24

B0.24

C24000

D0.44

Correct answer

D. 0.44

Explanation

The correct answer is 0.44.

274Chemical EngineeringMedium

Penetration test determines the ________ of the grease?

AService temperature

BVariation in viscosity with temperature

CStiffness

DLubricating properties (e.g. oilness)

Correct answer

C. Stiffness

Explanation

The correct answer is Stiffness.

275Chemical EngineeringMedium

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ________ times, when the number of tube passes is increased to 8?

A40.8

B40.4

C20.4

D20.8

Correct answer

A. 40.8

Explanation

The correct answer is 40.8.

276Chemical EngineeringMedium

Mild steel is a/an ________ steel?

AHigh alloy

BMedium carbon

CLow carbon

DHigh carbon

Correct answer

C. Low carbon

Explanation

The correct answer is Low carbon.

277Chemical EngineeringMedium

A fire tube boiler is limited to a maximum steam pressure of about ________ kg/cm2?

A38

B18

C52

Correct answer

B. 18

Explanation

The correct answer is 18.

278Chemical EngineeringMedium

Chemical reaction rate of a component depends upon the________?

APressure of the system

BAll A., B. and C.

CTemperature of the system

DComposition of the component only

Correct answer

B. All A., B. and C.

Explanation

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

279Chemical EngineeringMedium

A first order homogeneous reaction of the type X → Y → Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?

AIII, II, I

BI, II, III

CII, III, I

DIII, I, II

Correct answer

A. III, II, I

Explanation

The correct answer is III, II, I.

280Chemical EngineeringMedium

Trinitrotoluene (TNT), an explosive, is made by the nitration of ________?

ANitrobenzene

BToluene

CBenzene

DNitrotoluene

Correct answer

B. Toluene

Explanation

The correct answer is Toluene.