Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 379 of 557.

Chemical Engineering MCQs

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Baffles in the shell side of a shell and tube heat exchanger?

A.Increase the cross-section of the shell side liquid

B.Increase the shell side heat transfer co-efficient

C.Decrease the shell side heat transfer co-efficient

D.Force the liquid to flow parallel to the bank

Explanation: The correct answer is Increase the shell side heat transfer co-efficient.

Submitted by: Academy of Pakistan

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Creep is not exhibited at low temperature by ________?

A.Plastics

B.Rubber

C.Acrylics

D.Lead

Explanation: The correct answer is Lead.

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Reverse osmosis is also called________?

A.Ultra-filtration

B.Diffusion

C.Dialysis

D.Electrodialysis

Explanation: The correct answer is Ultra-filtration.

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A reactor having a salvage value of Rs. 10000 is estimated to have a service life of 10 years. The annual interest rate is 10%. The original cost of the reactor was Rs. 80000. The book value of the reactor after 5 years using sinking fund depreciation method will be Rs ________?

A.43,196

B.40,096

C.53,196

D.60,196

Explanation: The correct answer is 60,196.

Submitted by: Academy of Pakistan

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Which of the following gaseous fuels is likely to have the highest gross calorific value?

A.Producer gas

B.Natural gas

C.Sewage gas

D.LPG

Explanation: The correct answer is LPG.

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Horsepower required for a roll crusher is directly proportional to its________?

A.Neither A. nor B.

B.Both A. & B.

C.Reduction ratio

D.Capacity

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

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A BTU/hr.ft.2 °F is equal to________?

A.1 kcal/hr. m2°C

B.4.88 kcal/hr. m.2°C

C.None of these

D.1 kcal/hr. m2.°K

Explanation: The correct answer is 4.88 kcal/hr. m.2°C.

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Volute of a centrifugal pump should be designed in a fashion, such that the________?

A.Mean velocity remains constant

B.None of these

C.Kinetic head gets converted into static head

D.Moving stream gradually reduces velocity

Explanation: The correct answer is Kinetic head gets converted into static head.

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Carbon is present in the combined form (carbide) in case of________?

A.Pig iron

B.Ferroalloys

C.All A., B. & C.

D.Steel

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

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Multistage catalytic converter is not used in the________?

A.Neither A. nor B.

B.Conversion of SO2 to SO3

C.Both A. and B.

D.NH3 synthesis reaction

Explanation: The correct answer is NH3 synthesis reaction.

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A typical yield of diesel in straight run distillation of crude oil may be about ________ percent?

A.8

B.35

C.18

D.28

Explanation: The correct answer is 8.

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A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to________?

A.8 mm

B.5 mm

C.10 mm

D.6 mm

Explanation: The correct answer is 10 mm.

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Pick out the correct statement?

A.Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

B.COD is related to BOD of a given waste in water but the relationship varies for different

C.COD is determined by oxidising the organic matter present in water with potassium

D.All A., B. and C.

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

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Critical compressibility factor for all substances________?

A.None of these

B.Vary as square of the absolute pressure

C.Vary as square of the absolute temperature

D.Are more or less constant (vary from 0.2 to 0.3)

Explanation: The correct answer is Are more or less constant (vary from 0.2 to 0.3).

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A series of equal payments (e.g., deposit or cost) made at equal intervals of time is known as ________?

A.Perpetuity

B.Annuity

C.Future worth

D.Capital charge factor

Explanation: The correct answer is Annuity.

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