Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 14 of 557.

Chemical Engineering MCQs

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In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow?

A.Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

B.Water discharge from a vertical vessel in which constant level is maintained

C.Discharge of water by a centrifugal pump being run at a constant rpm

D.Water flow in the suction and discharge pipe of a reciprocating pump

Explanation: The correct answer is Water flow in the suction and discharge pipe of a reciprocating pump.

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Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will________?

A.Decrease

B.Increase

C.Remain unchanged

D.Increase or decrease depending on the pipe material

Explanation: The correct answer is Increase.

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Chemical engineering thermodynamics is concerned with the ________ in/of chemical processes?

A.Reaction mechanism

B.Energy transformation from one form to another

C.None of these

D.Calculation of rates

Explanation: The correct answer is Energy transformation from one form to another.

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Kick’s law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick’s constant is________?

A.kW. sec/kg

B.kWh/sec. kg

C.kWh/kg

D.kg/sec

Explanation: The correct answer is kW. sec/kg.

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Hardening of steel is not possible unless it is heated ________ critical point?

A.Between the first & second

B.Above the highest

C.Above the lowest

D.Between the second & third

Explanation: The correct answer is Above the lowest.

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For the reaction, A + B → 2B + C,________?

A.rA = 2rB

B.rA = rB

C.rA = rB/2

Explanation: The correct answer is rA = rB.

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The operating cost of a distillation column at minimum reflux ratio is________?

A.Maximum

B.Zero

C.Infinite

D.Minimum

Explanation: The correct answer is Minimum.

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The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called________?

A.Elutriation or elution

B.Decoction

C.None of these

D.Percolation

Explanation: The correct answer is Elutriation or elution.

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Mild steel is used for making________?

A.Channels

B.Die block

C.Fish plates

D.Drop forging

Explanation: The correct answer is Channels.

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Diaphragm electrolytic cell as compared to mercury electrolytic cell________?

A.Requires less specific power consumption for the production of chlorine

B.Produces 70% NaOH solution

C.Requires lesser investment for similar capacity

D.All A, B. and C

Explanation: The correct answer is Requires lesser investment for similar capacity.

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Solvay process is used for the manufacture of________?

A.Caustic soda

B.Caustic potash

C.Soda ash

D.Soda lime

Explanation: The correct answer is Soda ash.

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Nylon-66 is so named because the________?

A.Number of carbon atoms between two nitrogen atoms are 6

B.Polymer was first synthesised in 1966

C.Number of nitrogen atoms between two carbon atoms are 6

D.Average degree of polymerisation of the polymer is 1966

Explanation: The correct answer is Average degree of polymerisation of the polymer is 1966.

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Mercaptans is represented as (where R and R’ are alkyl groups) ________?

A.R-COOH

B.R-S-R

C.R-S-H

Explanation: The correct answer is R-S-H.

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A dummy activity is used in PERT network to describe the________?

A.Resource restriction

B.Necessary time delay

C.Precedence relationship

D.Resource idleness

Explanation: The correct answer is Precedence relationship.

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Baffles are provided in heat exchangers to increase the________?

A.Heat transfer rate

B.Fouling factor

C.Heat transfer area

D.Heat transfer co-efficient

Explanation: The correct answer is Heat transfer co-efficient.

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