MCQs

Chemical Engineering MCQs with Explanations

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2451Chemical EngineeringMedium

Which of the following screens has the maximum capacity?

AVibrating screen

BShaking screen

CGrizzlies

DTrommels

Correct answer

A. Vibrating screen

Explanation

The correct answer is Vibrating screen.

2452Chemical EngineeringMedium

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________?

A1.741 h1

B0.574 h1

C0.794 h1

D1.26 h1

Correct answer

C. 0.794 h1

Explanation

The correct answer is 0.794 h1.

2453Chemical EngineeringMedium

A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is________?

A0.58

B0.62

C0.50

D0.68

Correct answer

C. 0.50

Explanation

The correct answer is 0.50.

2454Chemical EngineeringMedium

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place________?

ABoth B & C

BFrom one part of a body to the another part of the same body

CBetween two bodies not in physical contact with each other

DBetween two bodies in physical contact with each other

Correct answer

C. Between two bodies not in physical contact with each other

Explanation

The correct answer is Between two bodies not in physical contact with each other.

2455Chemical EngineeringMedium

Which of the following cannot measure a temperature of 1600°C?

APhoto-electric pyrometer

BRadiation pyrometer

CThermocouple

DPlatinum resistance thermometer

Correct answer

D. Platinum resistance thermometer

Explanation

The correct answer is Platinum resistance thermometer.

2456Chemical EngineeringMedium

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around________?

A0.60

B0.24

C0.72

Correct answer

D. 1

Explanation

The correct answer is 1.

2457Chemical EngineeringMedium

The recovery of penicillin from the acidified fermentation broth is done by________?

ALiquid extraction

BEvaporation

CAbsorption

DDistillation

Correct answer

A. Liquid extraction

Explanation

The correct answer is Liquid extraction.

2458Chemical EngineeringMedium

Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?

AAgO

BAl2O3

CFe2O3

DZnCl2

Correct answer

A. AgO

Explanation

The correct answer is AgO.

2459Chemical EngineeringMedium

With increase in drum speed, in a rotary drum filter, the filtration rate________?

AIs not affected

BIncreases

CIncreases linearly

DDecreases

Correct answer

B. Increases

Explanation

The correct answer is Increases.

2460Chemical EngineeringMedium

Fatigue failure of a material results from ________ stress?

AFluctuating

BNone of these

CCompressive

DTensile

Correct answer

A. Fluctuating

Explanation

The correct answer is Fluctuating.

Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place________?

ABoth B & C

BFrom one part of a body to the another part of the same body

CBetween two bodies not in physical contact with each other

DBetween two bodies in physical contact with each other

Correct answer

C. Between two bodies not in physical contact with each other

Explanation

The correct answer is Between two bodies not in physical contact with each other.