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Chemical Engineering MCQs with Explanations

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181Chemical EngineeringMedium

Shaft/rotor speed is most accurately measured by a________?

AFrequency counter

BSpeedometer

CTachometer

DStrobometer

Correct answer

D. Strobometer

Explanation

The correct answer is Strobometer.

182Chemical EngineeringMedium

Out of the following, the most malleable material is________?

ALead

BAluminium

CWrought iron

DCopper

Correct answer

A. Lead

Explanation

The correct answer is Lead.

183Chemical EngineeringMedium

Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

ANone of these

BTroposphere

CThermosphere

DStratosphere

Correct answer

B. Troposphere

Explanation

The correct answer is Troposphere.

184Chemical EngineeringMedium

Which of the following conveyors cannot be recommended for transportation of abrasive materials?

ABelt conveyor

BChain conveyor

CFlight conveyor

DApron conveyor

Correct answer

C. Flight conveyor

Explanation

The correct answer is Flight conveyor.

185Chemical EngineeringMedium

Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about ________ kg/cm2?

B12

D1.5

Correct answer

C. 3

Explanation

The correct answer is 3.

186Chemical EngineeringMedium

Which will have the least volatile matter and hence will be the most difficult to ignite?

ASemi-bituminous coal

BBituminous coal

CAnthracite

DCoke

Correct answer

D. Coke

Explanation

The correct answer is Coke.

187Chemical EngineeringMedium

For a first order reaction carried out in a plug flow reactor, the space time is________?

Ak ln C/C0

Bk ln C0/C

C(1/k) ln C0/C

D(1/k) ln C/C0

Correct answer

C. (1/k) ln C0/C

Explanation

The correct answer is (1/k) ln C0/C.

188Chemical EngineeringMedium

During sensible cooling process ________?

ARelative humidity decreases

BRelative humidity increases

CBoth B. and C.

DWet bulb temperature decreases

Correct answer

C. Both B. and C.

Explanation

The correct answer is Both B. and C..

189Chemical EngineeringMedium

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ________ mm of water column per metre height of packing?

A50-75

B750-1000

C25-50

D200-250

Correct answer

A. 50-75

Explanation

The correct answer is 50-75.

190Chemical EngineeringMedium

Calorific value of coke oven gas is around ________ Kcal/Nm3?

A4200

B7500

C900

D2000

Correct answer

A. 4200

Explanation

The correct answer is 4200.

181Chemical EngineeringMedium

Shaft/rotor speed is most accurately measured by a________?

AFrequency counter

BSpeedometer

CTachometer

DStrobometer

Correct answer

D. Strobometer

Explanation

The correct answer is Strobometer.

182Chemical EngineeringMedium

Out of the following, the most malleable material is________?

ALead

BAluminium

CWrought iron

DCopper

Correct answer

A. Lead

Explanation

The correct answer is Lead.

183Chemical EngineeringMedium

Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?

ANone of these

BTroposphere

CThermosphere

DStratosphere

Correct answer

B. Troposphere

Explanation

The correct answer is Troposphere.

184Chemical EngineeringMedium

Which of the following conveyors cannot be recommended for transportation of abrasive materials?

ABelt conveyor

BChain conveyor

CFlight conveyor

DApron conveyor

Correct answer

C. Flight conveyor

Explanation

The correct answer is Flight conveyor.

185Chemical EngineeringMedium

Pressure maintained in the high pressure primary tower of a three stage crude oil distillation system is about ________ kg/cm2?

B12

D1.5

Correct answer

C. 3

Explanation

The correct answer is 3.

186Chemical EngineeringMedium

Which will have the least volatile matter and hence will be the most difficult to ignite?

ASemi-bituminous coal

BBituminous coal

CAnthracite

DCoke

Correct answer

D. Coke

Explanation

The correct answer is Coke.

187Chemical EngineeringMedium

For a first order reaction carried out in a plug flow reactor, the space time is________?

Ak ln C/C0

Bk ln C0/C

C(1/k) ln C0/C

D(1/k) ln C/C0

Correct answer

C. (1/k) ln C0/C

Explanation

The correct answer is (1/k) ln C0/C.

188Chemical EngineeringMedium

During sensible cooling process ________?

ARelative humidity decreases

BRelative humidity increases

CBoth B. and C.

DWet bulb temperature decreases

Correct answer

C. Both B. and C.

Explanation

The correct answer is Both B. and C..

189Chemical EngineeringMedium

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ________ mm of water column per metre height of packing?

A50-75

B750-1000

C25-50

D200-250

Correct answer

A. 50-75

Explanation

The correct answer is 50-75.

190Chemical EngineeringMedium

Calorific value of coke oven gas is around ________ Kcal/Nm3?

A4200

B7500

C900

D2000

Correct answer

A. 4200

Explanation

The correct answer is 4200.