Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 202 of 557.

Chemical Engineering MCQs

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In a semi-batch reactor ________?

A.Residence time is constant

B.Condition similar to plug flow reactor exists

C.Mixing takes place in axial direction only

D.Velocity of reaction can be controlled

Explanation: The correct answer is Velocity of reaction can be controlled.

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Fireclay bricks are not used in the ________?

A.Coke oven regenerators

B.Beehive coke oven

C.By-product coke oven walls

D.Combustion chamber of B.F. stoves

Explanation: The correct answer is By-product coke oven walls.

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A 2′′ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is________?

A.Δp2

B.Δp

Explanation: The correct answer is Δp.

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The ________ of a double acting reciprocating pump as compared to the single acting pump will be almost double?

A.Head developed

B.Flow output

C.Weight

D.Overall efficiency

Explanation: The correct answer is Flow output.

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The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding ________ grinding wheel is normally used?

A.Hard

B.Aluminium oxide

C.Soft

D.Silicon carbide

Explanation: The correct answer is Aluminium oxide.

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Boiling point of a solution according to Duhring’s rule is a linear function of the ________ of water?

A.Thermal conductivity

B.Density

C.Viscosity

D.Boiling point (at the same pressure)

Explanation: The correct answer is Boiling point (at the same pressure).

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With increase in the density of silica refractories, its________?

A.Resistance to slag attack increases

B.Neither A. nor B.

C.Both A. and B.

D.Spalling resistance reduces

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

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Space time equals the mean residence time________?

A.For large diameter tubular reactor

B.For CSTR

C.When the density of the reaction mixture is constant

D.For narrow diameter tubular reactor

Explanation: The correct answer is When the density of the reaction mixture is constant.

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Pick out the wrong statement?

A.Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and

B.Tungsten steel and alnico are not hard magnetic materials

C.Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic

D.A ferromagnetic material becomes paramagnetic above the ‘Curie temperature’

Explanation: The correct answer is Tungsten steel and alnico are not hard magnetic materials.

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Vulcanisation of rubber________?

A.Decreases its tensile strength

B.Increases its oil & solvent resistance

C.Converts its plasticity into elasticity

D.Increases its ozone & oxygen reactivity

Explanation: The correct answer is Converts its plasticity into elasticity.

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Fat dispersed in water is exemplified by________?

A.Gel

B.Colloids

C.Butter

D.Emulsion

Explanation: The correct answer is Butter.

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Which of the following is not endothermic?

A.Cracking

B.Gasification

C.Reforming

D.Partial oxidation

Explanation: The correct answer is Partial oxidation.

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Roof of a basic open hearth furnace is lined with ________ bricks?

A.Fireclay

B.Silica

C.Magnesite

D.Dolomite

Explanation: The correct answer is Silica.

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Which of the following is not a unit of reaction rate?

A.Moles for med/(surface of catalyst) (time)

B.Mole formed/volume of catalyst) (time)

C.None of these

D.Moles formed/volume of reactor) (time)

Explanation: The correct answer is None of these.

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Which is an amorphous material?

A.Cast iron

B.Mica

C.Brass

D.Glass

Explanation: The correct answer is Glass.

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