Chemical Engineering MCQs

6108 MCQs  (Page 271 of 611)

Attempt Chemical Engineering Quiz
Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes?
A. 18
B. 24
C. 6
D. 12
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The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the _____________________?
A. Equilibrium constant is infinite
B. Fractional conversion of ‘a’ at equilibrium is unity
C. Concentration of ‘a’ at equilibrium is zero
D. All a., b. and c.
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For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?
A. Cstr of volume v
B. Pfr of volume v
C. Cstr of volume v/x
D. Pfr of volume v/x
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Fractional conversion _________________ for an exothermic reversible chemical reaction, when the temperature is maximum?
A. Increases
B. Remains unchanged
C. Decreases
D. Unpredictable from the data
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Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?
A. Proportional to
B. Independent of
C. Inversely proportional to
D. Proportional to the square of
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For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?
A. Ideal plug flow
B. Bypass
C. Dead zone
D. Channelling
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The use of space time is preferred over the mean residence time in the design of a/an____________________?
A. Batch reactor
B. Ideal tubular-flow reactor
C. Slurry reactor
D. Cstr
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A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?
A. Diffusion within the pellet
B. Reaction
C. External mass transfer
D. None of the above
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Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?
A. 3
B. 4
C. 6
D. 10
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The concentration of A in a first order reaction, A → B, decreases_____________________?
A. Linearly with time
B. Exponentially with time
C. Very abruptly towards the end of the reaction
D. Logarithmically with time
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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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