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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 102 of 557.

Chemical Engineering MCQs

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In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)________?

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A.CA3
B.CA2
C.CA4
D.CA
Explanation: The correct answer is CA2.

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Pick out the wrong statement?

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A.Teflon is formed by step growth polymerisation
B.Addition polymers are generally formed by chain growth polymerisation
C.Condensation polymers are generally formed by step growth polymerisation
D.Bakelite is formed by step growth polymerisation
Explanation: The correct answer is Teflon is formed by step growth polymerisation.

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Pressure drop due to pipe fittings can be estimated by the equation, ΔP/ρ = 4f, (Le/D) (V2/2gc) where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (Le/D) (dimensionless) for 45° elbow and 180° close return bends would be respectively around________?

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A.5 and 10
B.45 and 75
C.300 and 500
D.180 and 300
Explanation: The correct answer is 45 and 75.

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