Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 86 of 557.

Chemical Engineering MCQs

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Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively?

A.Oxides of nitrogen & Cr2O3

B.V2O5 & Cr2O3.

C.Oxides of nitrogen & V2O5 on a porous carrier

D.V2O5 on a porous carrier & oxides of nitrogen

Explanation: The correct answer is Oxides of nitrogen & V2O5 on a porous carrier.

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Filter aid is used to________?

A.Decrease the pressure drop

B.Increase the rate of filtration

C.Act as a support base for the septum

D.Increase the porosity of the cake

Explanation: The correct answer is Increase the porosity of the cake.

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In hot wire anemometer used for gas flow measurement, the wire is normally made of ________?

A.Copper

B.Constantan

C.Chromium

D.Platinum

Explanation: The correct answer is Platinum.

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Shrinkage allowance on pattern is provided to compensate for shrinkage when the ________?

A.Solid phase temperature drops from freezing temperature to the room temperature

B.Liquid metal temperature drops from pouring temperature to room temperature

C.Metal changes from liquid state to solid state at freezing temperature

D.Liquid metal temperature drops from pouring temperature to freezing temperature

Explanation: The correct answer is Solid phase temperature drops from freezing temperature to the room temperature.

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Flights in a rotary dryer are provided to________?

A.Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

B.None of these

C.Reduce the residence time of solid

D.Increase the residence time of the solid

Explanation: The correct answer is Lift and shower the solids thus exposing it thoroughly to the drying action of the gas.

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Heavy water used in the nuclear reactors to slow down the speed of neutrons is ________?

A.None of these

B.Highly purified water

C.Water having dissolved salts of heavy metals

D.A compound of oxygen and deuterium

Explanation: The correct answer is A compound of oxygen and deuterium.

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Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is ________?

A.20

B.10

C.0

D.12.5

Explanation: The correct answer is 0.

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The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is________?

A.1.25

B.0.25

C.0.50

D.0.75

Explanation: The correct answer is 0.25.

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Air vessel provided in a reciprocating pump is for________?

A.Decreasing the acceleration head

B.Making the friction in pipe uniform

C.Increasing the acceleration head

D.None of these

Explanation: The correct answer is Making the friction in pipe uniform.

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1 bar is almost equal to ________ atmosphere?

A.100

B.1000

C.1

D.10

Explanation: The correct answer is 1.

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In an incompressible flow of fluid, the fluid ________?

A.Compressibility is greater than zero

B.Temperature remains constant

C.Is frictionless

D.Density does not change with pressure & temperature

Explanation: The correct answer is Density does not change with pressure & temperature.

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Alcohol content in freshly prepared natural and fortified wine may be respectively around ________ percent?

A.10 – 20 and 40 – 50

B.7-14 and 40-50

C.14 – 30 and 40-50

D.7-14 and 14-30

Explanation: The correct answer is 7-14 and 14-30.

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Phosphorus vapour comprises of ________?

A.P3

B.P2

C.P

D.P4

Explanation: The correct answer is P4.

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Thermal shield is used in high powered nuclear reactors to________?

A.Slow down the secondary neutrons

B.Absorb the fast neutrons

C.Protect the walls of the reactor from radiation damage

D.Protect the fuel element from coming in contact with the coolant

Explanation: The correct answer is Protect the walls of the reactor from radiation damage.

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Chemical kinetics can predict the ________ of a chemical reaction?

A.Rate

B.Neither A. nor B.

C.Feasibility

D.Both A. & B.

Explanation: The correct answer is Rate.

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