MCQs

Chemical Engineering MCQs with Explanations

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3161Chemical EngineeringMedium

A stirred tank reactor compared to tubular-flow reactor provides________?

AHigher overall selectivity for a first order consecutive reaction

BMore uniform operating conditions

CAll A., B. and C.

DPermits operation at the optimum temperature for a long reaction time

Correct answer

C. All A., B. and C.

Explanation

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

3162Chemical EngineeringMedium

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is ________ percent?

ANone of these

B71%

CIn between 37 & 71%

Correct answer

C. In between 37 & 71%

Explanation

The correct answer is In between 37 & 71%.

3163Chemical EngineeringMedium

Pressure differential maintained across a continuous rotary vacuum filter is in the range of ________ mm Hg column?

A250 to 500

B100 to 150

C50 to 100

D600 to 700

Correct answer

A. 250 to 500

Explanation

The correct answer is 250 to 500.

3164Chemical EngineeringMedium

During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the________?

AGas film

BNone of these

CLiquid-gas interface

DLiquid film

Correct answer

D. Liquid film

Explanation

The correct answer is Liquid film.

3165Chemical EngineeringMedium

Thermit welding is categorised as the ________ welding?

AFusion

BForge

CResistance

DArc

Correct answer

A. Fusion

Explanation

The correct answer is Fusion.

3166Chemical EngineeringMedium

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about ________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate?

C1⁄2

Correct answer

D. 8

Explanation

The correct answer is 8.

3167Chemical EngineeringMedium

(Le/D) for fully open gate valves would be ________?

AAround 7

BMuch less (say 2% than that for fully open globe valves)

CBoth B. and C.

DMuch more than that for fully open globe valves

Correct answer

C. Both B. and C.

Explanation

The correct answer is Both B. and C..

3168Chemical EngineeringMedium

The 92U238 emits an a-particle. The product is________?

A92U236

B90U236

C90U234

D90U238

Correct answer

C. 90U234

Explanation

The correct answer is 90U234.

3169Chemical EngineeringMedium

Which of the following can be used for the direct measurement of volumetric flow rate of slurry?

AOrificemeter

BRotameter

CPitot tube

DVenturimeter

Correct answer

B. Rotameter

Explanation

The correct answer is Rotameter.

3170Chemical EngineeringMedium

For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is________?

A11

C22

Correct answer

A. 11

Explanation

The correct answer is 11.

3161Chemical EngineeringMedium

A stirred tank reactor compared to tubular-flow reactor provides________?

AHigher overall selectivity for a first order consecutive reaction

BMore uniform operating conditions

CAll A., B. and C.

DPermits operation at the optimum temperature for a long reaction time

Correct answer

C. All A., B. and C.

Explanation

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

3162Chemical EngineeringMedium

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is ________ percent?

ANone of these

B71%

CIn between 37 & 71%

Correct answer

C. In between 37 & 71%

Explanation

The correct answer is In between 37 & 71%.

3163Chemical EngineeringMedium

Pressure differential maintained across a continuous rotary vacuum filter is in the range of ________ mm Hg column?

A250 to 500

B100 to 150

C50 to 100

D600 to 700

Correct answer

A. 250 to 500

Explanation

The correct answer is 250 to 500.

3164Chemical EngineeringMedium

During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the________?

AGas film

BNone of these

CLiquid-gas interface

DLiquid film

Correct answer

D. Liquid film

Explanation

The correct answer is Liquid film.

3165Chemical EngineeringMedium

Thermit welding is categorised as the ________ welding?

AFusion

BForge

CResistance

DArc

Correct answer

A. Fusion

Explanation

The correct answer is Fusion.

3166Chemical EngineeringMedium

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about ________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate?

C1⁄2

Correct answer

D. 8

Explanation

The correct answer is 8.

3167Chemical EngineeringMedium

(Le/D) for fully open gate valves would be ________?

AAround 7

BMuch less (say 2% than that for fully open globe valves)

CBoth B. and C.

DMuch more than that for fully open globe valves

Correct answer

C. Both B. and C.

Explanation

The correct answer is Both B. and C..

3168Chemical EngineeringMedium

The 92U238 emits an a-particle. The product is________?

A92U236

B90U236

C90U234

D90U238

Correct answer

C. 90U234

Explanation

The correct answer is 90U234.

3169Chemical EngineeringMedium

Which of the following can be used for the direct measurement of volumetric flow rate of slurry?

AOrificemeter

BRotameter

CPitot tube

DVenturimeter

Correct answer

B. Rotameter

Explanation

The correct answer is Rotameter.

3170Chemical EngineeringMedium

For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is________?

A11

C22

Correct answer

A. 11

Explanation

The correct answer is 11.