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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 15 of 557.

Chemical Engineering MCQs

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Pick out the wrong statement about the machinability of metals. Machinability of a metal?

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A.Decreases with increase in hardness, in general
B.Depend on the composition, microstructure and physical & mechanical properties
C.Decreases with increases in tensile strength & decrease in grain size
D.Decreases with increase in strain hardening tendencies
Explanation: The correct answer is Decreases with increases in tensile strength & decrease in grain size.

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There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about ________ °C/km?

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A.15
B.1
C.6.5
D.0.05
Explanation: The correct answer is 6.5.

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Select the correct statement from the following?

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A.The amplitude ratio of a pure capacity process is inversely proportional to frequency
B.The phase lag of a pure time delay system decreases with increasing frequency
C.The amplitude ratio of a pure time delay system increases with frequency
D.The frequency response of a pure capacity process is unbounded
Explanation: The correct answer is The amplitude ratio of a pure capacity process is inversely proportional to frequency.

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