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Chemical Engineering MCQs with Explanations

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521Chemical EngineeringMedium

Friction factor for fluid flow in pipe does not depend upon the________?

APipe roughness

BMass flow rate of fluid

CFluid density & viscosity

DPipe length

Correct answer

D. Pipe length

Explanation

The correct answer is Pipe length.

522Chemical EngineeringMedium

Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________?

AOrificemeter

BRotameter

CVenturimeter

DPitot tube

Correct answer

D. Pitot tube

Explanation

The correct answer is Pitot tube.

523Chemical EngineeringMedium

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________?

ARange is 15°F

BBoth A. & B.

CApproach is 10°F

DNeither A. nor B.

Correct answer

B. Both A. & B.

Explanation

The correct answer is Both A. & B..

524Chemical EngineeringMedium

Celluloid is________?

ACellulose acetate butyrate

BCellulose nitrate

CCellulose acetate

DRegenerated cellulose

Correct answer

B. Cellulose nitrate

Explanation

The correct answer is Cellulose nitrate.

525Chemical EngineeringMedium

For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ________ plate requirement?

AMarginal decrease in the number of

BMajor decrease in the number of

CNo change in theoretical

DNone of these

Correct answer

A. Marginal decrease in the number of

Explanation

The correct answer is Marginal decrease in the number of.

526Chemical EngineeringMedium

Calorific values of both the solid as well as the liquid fuels can be determined by ________ calorimeter?

ABomb

BJunkers

CBoy’s

DNone of these

Correct answer

A. Bomb

Explanation

The correct answer is Bomb.

527Chemical EngineeringMedium

Silicon percentage in the silicon steel used for electrical appliances/equipments is________?

A20-25

B12-14

C0.3-0.4

D3-4

Correct answer

D. 3-4

Explanation

The correct answer is 3-4.

528Chemical EngineeringMedium

For an absorber, both equilibrium and operating line will be straight for ________?

ADilute solution and non-isothermal operation

BDilute solution and isothermal operation

CConcentrated solution and non-isothermal operation

DConcentrated solution and isothermal operation

Correct answer

B. Dilute solution and isothermal operation

Explanation

The correct answer is Dilute solution and isothermal operation.

529Chemical EngineeringMedium

The maximum discharge through a circular channel takes place, when the depth of the fluid flow is ________ times the pipe diameter?

A0.5

B0.66

C0.25

D0.95

Correct answer

D. 0.95

Explanation

The correct answer is 0.95.

530Chemical EngineeringMedium

A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be________?

A0°K

B-273°C

C– 136.5°K

D-136.5°C

Correct answer

D. -136.5°C

Explanation

The correct answer is -136.5°C.

For an absorber, both equilibrium and operating line will be straight for ________?

ADilute solution and non-isothermal operation

BDilute solution and isothermal operation

CConcentrated solution and non-isothermal operation

DConcentrated solution and isothermal operation

Correct answer

B. Dilute solution and isothermal operation

Explanation

The correct answer is Dilute solution and isothermal operation.