Chemical Reaction Engineering GATE-2002

Q 1: For an ideal plug flow reactor the value of the Peclet number is

A) 0
B) ∞
C) 1
D) 10

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Q 2: The extent of a reaction is

A) different for reactants and products
B) dimensionless
C) dependent on the stoichiometric coefficients
D) all of the above

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Q 3: An exothermic reaction takes place in an adiabatic reactor. The product temperature (choose the correct option) _____________ the reactor feed temperature

A) is always equal to
B) is always greater than
C) is always less than
D) may be greater or less than

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Q 4:  10. A pulse tracer is introduced in an ideal CSTR (with a mean residence time τ) at time t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be

A) 2τ
B) 0.5τ
C) τ/0.693
D) 0.693τ

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Q 5: A batch adiabatic reactor at an initial temperature of 373 K is being used for the reaction A → B. Assume the heat of the reaction is -1 kJ/mol at 373 K and the heat capacity of both A and B to be constant and equal to 50 J/mol K. The temperature rises after a conversion of 0.5 will be

A) 50 ˚C
B) 100 ˚C
C) 200 ˚C
D) 1000 ˚C

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