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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 268 of 557.

Chemical Engineering MCQs

Showing page 268 of 557 · 8,342 total solved questions available.

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Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the________?

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A.Temperature of the fin end
B.Average temperature of the fin
C.Constant temperature equal to that of the base
D.Surrounding temperature
Explanation: The correct answer is Constant temperature equal to that of the base.

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Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when________?

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A.Only vapor phase follows Raoult’s law
B.Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law
C.Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
D.Only liquid phase obeys Dalton’s law
Explanation: The correct answer is Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law.

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Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2.s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is ________?

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A.5.6 × 10-3
B.5.6 × 10-4
C.8.5 × 10-3
D.8.5 × 10-4
Explanation: The correct answer is 8.5 × 10-4.

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