Chemical Engineering MCQs

6108 MCQs  (Page 279 of 611)

Attempt Chemical Engineering Quiz
When a catalyst increases the rate of chemical reaction, the rate constant_____________________?
A. Decreases
B. Increases
C. Remain constant
D. Become infinite
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What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only ?
A. Zero
B. First
C. Second
D. Third
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Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?
A. Temperature should be high in the beginning and decreased towards the end of the reaction
B. Very low temperature should be used throughout the reaction
C. Very high temperature should be used throughout the reaction
D. None of these
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The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?
A. 2/3
B. 5/8
C. 1/3
D. 3/8
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The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?
A. Jacketed liquid phase cstr
B. Jacketed steam heated multitubular reactor
C. Multitubular reactor with cooling
D. Multistage multitubular reactor with interstage cooling
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For a zero order reaction, the concentration of product increases with the _____________________?
A. Increase of reaction time
B. Increase in initial concentration
C. Total pressure
D. Decrease in total pressure
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The space time is equivalent to the holding time in a steady state mixed reactor for_____________________?
A. Non-isothermal gas reaction
B. Variable fluid density systems
C. Constant fluid density systems
D. Gas reactions with changing number of moles
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The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is __________________?
A. 0
B. 1
C. 1.5
D. 2
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The rate constant of a reaction depends on the __________________?
A. Initial concentration of reactants
B. Time of reaction
C. Temperature of the system
D. Extent of reaction
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The enzyme which can catalyse the conversion of glucose to ethyl alcohol is ___________________?
A. Invertase
B. Maltase
C. Diastase
D. Zymase
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Word of the Day
28 Jul
Fragile
(of an object) easily broken or damaged.
نازک، کاغذی، آسانی سے ٹوٹ جانیوالا

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