ENCN281 Exam Questions with 100% Correct Answers 2024/2025
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Module
ENCN281
Institution
ENCN281
ENCN281 Exam Questions with 100% Correct Answers 2024/2025
What is the Slope of a Zeroth-Order Reaction? - ANSWERSLinear with respect to concentration (C).
What is the Slope of a First-Order Reaction? - ANSWERSLinear with respect to natural logarithm of concentration (ln(C)).
What is the...
ENCN281 Exam Questions with 100%
Correct Answers 2024/2025
What is the Slope of a Zeroth-Order Reaction? - ANSWERSLinear with respect to concentration (C).
What is the Slope of a First-Order Reaction? - ANSWERSLinear with respect to natural logarithm of
concentration (ln(C)).
What is the Slope of a Second-Order Reaction? - ANSWERSLinear with respect to 1/concentration (1/C).
Main Principle of Mass Balances - ANSWERSConservation of mass.
Characteristics of a Conservative Substance - ANSWERSDoes not undergo chemical reactions.
Characteristics of a Steady State Substance - ANSWERSNo accumulation over time.
Characteristics of Ideal Reactors - ANSWERSUniform flow, uniform mixing, no rate or spatial variation.
Examples of Spatial Variations in a CMFR - ANSWERSBy-pass, dead-zone, recirculation.
Examples of Spatial Variations in a PFR - ANSWERSAxial dispersion, back-mixing.
Characteristics of Batch Reactors - ANSWERSNo inflow or outflow during reaction.
What is the characteristic of a Plug Flow Reactor (PFR)? - ANSWERSParticles pass through and exit in the
same relative position/sequence.
Provide an example of a PFR. - ANSWERSLong narrow rivers and drinking water pipes.
, What is true for Completely Mixed Flow Reactors (CMFR) and what assumption can be made? -
ANSWERSParticles entering are instantly dispersed with continuous inputs and outputs, hence assume
steady state.
Give an example of a CMFR. - ANSWERSReservoirs and lakes.
What are the differences between a PFR and a CMFR for an identical flow rate k in a first-order process? -
ANSWERSPFR requires a smaller volume to achieve the same conversion rate.
How can a non-steady state CMFR be modeled? - ANSWERSUsing a conservative tracer to track
movement in the reactor.
What are the characteristics of non-ideal reactors? - ANSWERSNon-uniform flow, insufficient mixing,
spatial variations.
What does the Residence Time Distribution (RTD) model and what is its diagnostic use? - ANSWERSIt
measures the time particles/fluid spend in a reactor and is used to diagnose non-ideal reactors.
For which type of reactors is the dispersion model used? - ANSWERSNon-ideal reactors.
In the dispersion model, what does a large D value indicate? - ANSWERSCompletely Mixed Flow Reactor
(CMFR).
What does a small D value indicate in the dispersion model? - ANSWERSPlug Flow Reactor (PFR)
For what type of reactors is the n-tanks in series model used? - ANSWERSNon-ideal reactors
What does a small N value signify in the n-tanks in series model? - ANSWERSComplete Mix Flow Reactor
(CMFR)
What does a large N value indicate in the n-tanks in series model? - ANSWERSPlug Flow Reactor (PFR)
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