Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 219 of 557.

Chemical Engineering MCQs

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Silicon in steel________?

A.All ‘A’, ‘B’ & ‘C’

B.Makes it usable in almost all magnetic circuits where alternating current is used

C.Is present upto 5% & 4% respectively when used in transformers & motor armatures

D.Increases its electrical resistivity and decreases the hysteresis loss

Explanation: The correct answer is All ‘A’, ‘B’ & ‘C’.

Submitted by: Academy of Pakistan

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The pipe wall thickness is minimum for a pipe of given nominal size having schedule number________?

A.160

B.80

C.40

D.120

Explanation: The correct answer is 40.

Submitted by: Academy of Pakistan

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Zeolite used in water softening process (cation exchange) is regenerated by washing with________?

A.Chloramines

B.Brine

C.Liquid chlorines

D.Sodium bisulphite

Explanation: The correct answer is Brine.

Submitted by: Academy of Pakistan

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Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________?

A.Platinum-platinum + rhodium

B.Chromel-alumel

C.Iron-constantan

D.None of these

Explanation: The correct answer is Chromel-alumel.

Submitted by: Academy of Pakistan

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Addition of calcium oxide to water produces________?

A.All A, B. & C.

B.Exothermic heat

C.Hissing sound

D.Slaked lime

Explanation: The correct answer is All A, B. & C..

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Which of the following is not a micro component present in coal?

A.Liptinite

B.Micrinite

C.Clarain

D.Fusinite

Explanation: The correct answer is Clarain.

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Calorific value as determined by bomb calorimeter is the________?

A.Higher calorific value at constant volume

B.Net calorific value at constant volume

C.Lower calorific value at constant pressure

D.Gross calorific value at constant pressure

Explanation: The correct answer is Higher calorific value at constant volume.

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The Prandtl mixing length is________?

A.Independent of radial distance from the pipe axis

B.Independent of the shear stress

C.Useful for computing laminar flow problems

D.Zero at the pipe wall and is a universal constant

Explanation: The correct answer is Useful for computing laminar flow problems.

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The velocity for subsonic flow in a pipeline________?

A.Decreases in the downstream direction

B.Is constant

C.Increases in the downstream direction

D.Is independent of the area of flow

Explanation: The correct answer is Increases in the downstream direction.

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Capillary tube method of viscosity measurement is based on the ________?

A.Navier-stokes equation

B.None of these

C.Hagen-Poiseuille’s equation

D.Stoke’s law

Explanation: The correct answer is Hagen-Poiseuille’s equation.

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Ionisation potential employed in the industrial electrostatic precipitator is of the order of________?

A.230 V DC

B.30 to 70 kV AC

C.30 to 70 kV DC

D.230 V AC

Explanation: The correct answer is 30 to 70 kV DC.

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Gases diffuse faster compared to liquids because of the reason that the liquid molecules________?

A.Move faster

B.Are held together by stronger inter-molecular forces

C.Are heavier

D.Have no definite shape

Explanation: The correct answer is Are held together by stronger inter-molecular forces.

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If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the________?

A.Temperature must decrease

B.Both B. and C.

C.Process must be isobaric

D.Process must be adiabatic

Explanation: The correct answer is Both B. and C..

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For an isothermal reversible compression of an ideal gas________?

A.dQ = dE

B.Only ΔH =0

C.Only ΔE = 0

D.ΔE = ΔH = 0

Explanation: The correct answer is ΔE = ΔH = 0.

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Crude oil is pumped by a ________ pump?

A.Screw

B.Reciprocating

C.Centrifugal

D.Gear

Explanation: The correct answer is Centrifugal.

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