Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 326 of 557.

Chemical Engineering MCQs

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In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by?

A.Removing some quantity of SO3 during intermediate stage

B.Maintaining low temperature & pressure in the converter

C.Increasing the oxygen concentration

D.Putting more quantity of V2O5 catalyst in the converter

Explanation: The correct answer is Removing some quantity of SO3 during intermediate stage.

Submitted by: Academy of Pakistan

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As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms)?

A.LS

B.250 LS

C.93 LS

Explanation: The correct answer is 93 LS.

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For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it________?

A.Decreases the outlet temperature of cooling medium

B.Decreases the pressure drop

C.None of these

D.Increases the overall heat transfer coefficient

Explanation: The correct answer is Increases the overall heat transfer coefficient.

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Which of the following is an undesirable property for an absorbing solvent?

A.None of these

B.Low vapour pressure

C.Low velocity

D.Low freezing point

Explanation: The correct answer is None of these.

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The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of ________ and COP are the same?

A.None of these

B.Work

C.Kinematic viscosity

D.Temperature

Explanation: The correct answer is None of these.

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Which of the following is an unsaturated fatty acid?

A.Oleic acid

B.Stearic acid

C.Palmitic acid

D.Lauric acid

Explanation: The correct answer is Oleic acid.

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Thermal pollution due to excessive heat & temperature in the working place causes________?

A.Fatigue

B.Reduction in working efficiency of manpower

C.High breathing rate

D.All A., B. & C.

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

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Production of a hollow product by inflation of a tube or parison is called the ________ process?

A.Calendaring

B.Extrusion

C.Blow moulding

D.Injection

Explanation: The correct answer is Blow moulding.

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Nitriding of steel is a process for________?

A.Normalising

B.Annealing

C.Spheroidising

D.Case hardening

Explanation: The correct answer is Case hardening.

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The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the________?

A.Electro-static precipitator

B.Gravity settling chamber

C.Venturi atomiser

D.Cyclone separator

Explanation: The correct answer is Electro-static precipitator.

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Which of the following is not a by-product fuel?

A.Blast furnace gas

B.Refinery gas

C.Petrol

D.Pitch

Explanation: The correct answer is Petrol.

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In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is ________?

A.S = ∞

B.S > 1

Explanation: The correct answer is S > 1.

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Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution?

A.A1 is highly acidic

B.A1 is more alkaline than solution A2

C.Both B. & C.

D.A2 is very slightly acidic

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

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In a gas-liquid shell and tube heat exchanger, the________?

A.Gases to be heated/cooled is normally routed through the shell side, because the corrosion

B.Gases under high pressure are routed through the tube side, because high pressure gases are

C.Presence of a non-condensable gas decreases the condensing film co-efficient

D.All A, B. & C.

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

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The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is________?

A.Induced draft cooling tower

B.Natural draft cooling tower

C.Spray chamber

D.None of these

Explanation: The correct answer is Spray chamber.

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