Chemical Engineering MCQs

6108 MCQs (Page 270 of 611)

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The vessel dispersion number (D/μL) for plug flow is_________________?

A. 0
B. 500
C. 750
D. ∞

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The rate constant of a reaction is a function of the ___________________?

A. Time of reaction
B. Temperature of the system
C. Extent of reaction
D. Initial concentration of the reactants

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Cold shot cooling is only practical when the feed temperature is ______________ than the reaction temperature?

A. Higher
B. Much higher
C. Lower
D. Much lower

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Autocatalytic reactions are best carried out in a_________________?

A. Cstr
B. Cstr in series
C. Plug flow reactor
D. Recycle reactor

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Bulk diffusion in catalyst pore _______________ with increase in pressure?

A. Increases
B. Decreases
C. Remains unchanged
D. Increases exponentially

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For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?

A. 0.253
B. 0.338
C. 0.152
D. 0.637

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The extent of a reaction is ___________________?

A. Different for reactants and products
B. Dimensionless
C. Depends on the stoichiometric co-efficient
D. All of the above

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Arrhenius equation represents graphically the variation between the ______________ and temperature?

A. Rate of reaction
B. Frequency factor
C. Rate constant
D. Activation energy

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For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is______________________?

A. Surface kc/(1 + ts) reaction between absorbed a and b in the gas phase
B. Surface reaction between absorbed a and absorbed b
C. Surface reaction between a in the gas phase and absorbed b
D. Desorption of c

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The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?

A. 0.5
B. -0.5
C. 1
D. 1.5

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