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Free download in PDF Chemical Reaction Engineering Multiple Choice Questions(MCQs) with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
Stimulus-response techniques are commonly used to characterize the extent of non-ideal flow in vessels. Tracer input signal is used as stimulus. Any material can be used
[A]
as tracer if it can disturb the flow pattern in the vessel
[B]
as tracer if it does not disturb the flow pattern in the vessel and it can be detected.
[C]
as tracer if it follows iedeal flow patterns
[D]
as tracer.
Answer: as tracer if it follows iedeal flow patterns
62
The exit age distribution of fluid leaving a vessel is used
[A]
to study the reaction mechanism
[B]
to study the extent of non-ideal flow in the vessel
[C]
to know the reaction rate constants
[D]
to know the activation energies of a reaction.
Answer: to study the extent of non-ideal flow in the vessel
63
Which of the following are example of autocatalytic reaction?
[A]
Enzyme fermentation reactions
[B]
Microbial fermentation reactions
[C]
Photochemical reactions
[D]
Synthesis of ammonia.
Answer: Photochemical reaction
64
A first-order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is
[A]
minimum when the reactors are of defferent sizes
[B]
maximum when the reactors are equal in size
[C]
minimum when the reactors are equal in size.
[D]
None
Answer: maximum when the reactors are equal in size
65
For identical feed composition, flow rate, conversion and for zero-order reactions the ration of the volume of mixed reactor to the vomume of plug flow reactor is
[A]
0
[B]
1
[C]
< 1
[D]
> 1
66
For identical feed composition, flow rate, conversion and for all positive reaction orders the ratio of the volume of mixed reactor to the the volume of plug flow reactor
[A]
is independent of the order of reaction
[B]
increases with increase in the order of reaction
[C]
decreases with increase in the order of reaction
[D]
increases linearly with increase in the order of reaction.
Answer: increases linearly with increase in the order of reaction.
67
In an ideal mixed reactor at steady-state
[A]
the composition throughout the reactor remains same
[B]
the exit stream has the same composition as the fluid within the reactor
[C]
the space-time is equivalent to holding time for constant density systems
[D]
all of these answers.
Answer: all of these answers.
68
In an ideal plug flow reator at steady state
[A]
there may be diffusion along the flow path
[B]
there must be lateral mixing of fluid
[C]
the composition of the reactant remains constant along a flow path
[D]
the fractional conversion of the reactant varies from point to point along a flow path
Answer: there may be diffusion along the flow path
69
For a steady-state mixed reactor the space-time is equivalent to the holding time for
[A]
constant fluid density systems
[B]
variable fluid density systems
[C]
non-isothermal gas reactions
[D]
gas reactions with changing number of moles.
Answer: variable fluid density systems
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