Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 226 of 557.

Chemical Engineering MCQs

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An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is ________?

A.Maximum at the exit of the reactor

B.Maximum at the inlet of the reactor

C.Maximum at the centre of the reactor

D.Constant throughout the reactor

Explanation: The correct answer is Maximum at the inlet of the reactor.

Submitted by: Academy of Pakistan

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Which of the following thermocouple materials does not contain nickel?

A.Chromel

B.Alumel

C.Constantan

D.None of these

Explanation: The correct answer is None of these.

Submitted by: Academy of Pakistan

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Absorptivity and reflectivity of a perfect black body are respectively ________?

A.0 and 1

B.0 and 0.5

C.1 and ∞

D.1 and 0

Explanation: The correct answer is 1 and 0.

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In catalytic cracking process, olefins crack ________ times faster than in thermal cracking process?

A.200-300

B.1000-10000

C.100

D.10

Explanation: The correct answer is 1000-10000.

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Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?

A.None of these

B.Diagonal square pitch

C.Square pitch

D.Triangular pitch

Explanation: The correct answer is Triangular pitch.

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Nichol’s chart deals with ________?

A.A.R. vs. phase lag of first order

B.Closed loop values vs. open loop values

C.Frequency response values of controllers

D.A.R. vs. phase lag of second order

Explanation: The correct answer is Closed loop values vs. open loop values.

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Film condensation is promoted on a/an ________ surface?

A.Coated

B.Clean & smooth

C.Dirty

D.Oily

Explanation: The correct answer is Clean & smooth.

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Concentration of a solution expressed in terms of ________ is independent of temperature?

A.None of these

B.Molarity

C.Normality

D.Molality

Explanation: The correct answer is Molality.

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Rotary kilns in cement industry are lined with ________bricks?

A.Lead

B.Fireclay

C.Silica

D.High alumina & high magnesia

Explanation: The correct answer is High alumina & high magnesia.

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Solutions having the same osmotic pressure are called ________ solutions?

A.Ideal

B.Saturated

C.Dilute

D.Isotonic

Explanation: The correct answer is Isotonic.

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Pick out the correct statement?

A.Aviation fuel should have very high cloud point

B.Paraffins have lower smoke point than aromatics

C.Paraffins have higher octane number than corresponding iso-paraffin

D.Suitability of kerosene as a fuel & as an illuminant may be determined by char value test

Explanation: The correct answer is Paraffins have lower smoke point than aromatics.

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Which of the following heat treatment processes is usually applied to castings?

A.Normalising

B.Tempering

C.Annealing

D.Carburising

Explanation: The correct answer is Carburising.

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If in the gaseous phase reaction, N2O4 ⇌ 2NO2, x is the part of N2O4 which dissociates, then the number of molecules at equilibrium will be________?

A.(1 + x)2

B.(1 + x)

Explanation: The correct answer is (1 + x).

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Celluloid is chemically________?

A.Regenerated cellulose

B.Cellulose nitrate

C.Cellulose acetate

D.Cellulose acetate butyrate

Explanation: The correct answer is Cellulose nitrate.

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In an integrated steel plant, NH3 present in coke oven gas is normally recovered as________?

A.NH4Cl

B.Liquid NH3

C.(NH4)2 NO3

D.(NH4)2SO4

Explanation: The correct answer is (NH4)2SO4.

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