Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 348 of 557.

Chemical Engineering MCQs

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Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

A.Very low temperature should be used throughout the reaction

B.Very high temperature should be used throughout the reaction

C.None of these

D.Temperature should be high in the beginning and decreased towards the end of the reaction

Explanation: The correct answer is Temperature should be high in the beginning and decreased towards the end of the reaction.

Submitted by: Academy of Pakistan

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Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’?

A.At the centre

B.At the wall

C.At d/8 from the wall

D.At d/4 from the wall

Explanation: The correct answer is At the wall.

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________ is the measure of the strength of refractory under the combined effect of temperature & load?

A.Specific gravity

B.RUL

C.Thermal conductivity

D.Porosity

Explanation: The correct answer is RUL.

Submitted by: Academy of Pakistan

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Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger?

A.Density

B.Viscosity

C.Pressure

D.Corrosiveness & fouling characteristics

Explanation: The correct answer is Density.

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Helium-mercury method can be used to determine the ________ of the catalyst particle?

A.All A., B., & C.

B.Pore volume

C.Porosity

D.Solid density

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

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Consumable electrodes are used in the ________ welding?

A.Thermit

B.Gas

C.Arc

D.Resistance

Explanation: The correct answer is Arc.

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Minimum fluidisation velocity for a specific system depends upon the________?

A.Particle size

B.Density of both the particle & the fluid

C.Fluid viscosity

D.All A., B. and C.

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

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The main product of high temperature carbonisation of coal is________?

A.Ammonia

B.Tar

C.Phenol

D.Coke

Explanation: The correct answer is Coke.

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For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a ________ relationship?

A.Linear

B.Parabolic

C.Hyperbolic

D.Logarithmic

Explanation: The correct answer is Logarithmic.

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Velocity at a certain point in case of streamline flow is________?

A.Neither A. nor B.

B.Both A. & B.

C.Independent of time

D.Constant

Explanation: The correct answer is Both A. & B..

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Fluid flow at increasing rate through a diverging pipe is an example of ________ flow?

A.Steady uniform

B.Steady non-uniform

C.Non-steady non-uniform

D.Non-steady uniform

Explanation: The correct answer is Non-steady non-uniform.

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Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than?

A.10

B.5

C.35

D.20

Explanation: The correct answer is 20.

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For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the ________ is the controlling resistance?

A.Film diffusion

B.Either A., B. or C.

C.Diffusion through ash layer

D.Chemical reaction

Explanation: The correct answer is Diffusion through ash layer.

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________ is used as a material of construction for the blade of power saw?

A.Wrought iron

B.High speed steel

C.Stainless steel

D.Mild steel

Explanation: The correct answer is High speed steel.

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Heat transfer rate per unit area is called________?

A.Thermal conductivity

B.Thermal diffusivity

C.Heat transfer co-efficient

D.Heat flux

Explanation: The correct answer is Heat flux.

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