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WorksheetsCEB2043/CFB2053 RE1_Ch 1_Intro & Mole Balance_Pre Assessment
Total questions: 10
Worksheet time: 5mins
Which of the following factors does NOT affect the reaction rate?
Color of the reactants
Presence of a catalyst
Temperature of the environment
Concentration of the reactants
In a batch reactor, how is the reaction time typically defined?
The reaction time is the temperature at which the reaction occurs.
The reaction time is typically defined as the duration of the reaction process in the reactor.
The reaction time is the pressure maintained during the reaction.
The reaction time is the amount of reactants used in the process.
What is the primary difference between batch and continuous reactors?
Batch reactors process reactants in discrete batches, whereas continuous reactors operate with a constant flow of reactants and products.
Batch reactors maintain a steady flow of products, while continuous reactors operate in cycles.
Batch reactors run continuously while continuous reactors are batch-based.
Continuous reactors process reactants in separate intervals, unlike batch reactors.
In a continuous reactor, what is the steady-state assumption?
The system reaches equilibrium with no changes in concentration.
The reaction rate increases indefinitely over time.
The concentrations of reactants and products remain constant over time.
The concentrations of reactants fluctuate continuously.
What does a mole balance equation account for in a reactor?
The input, output, generation, and consumption of moles of substances in a reactor.
The reaction rates, equilibrium constants, and catalyst activity in a reactor.
The mixing, separation, heating, and cooling of substances in a reactor.
The temperature, pressure, volume, and density of substances in a reactor.
Which of the following is a characteristic of a batch reactor?
Operates continuously with varying reactant amounts.
Uses an open system for constant flow.
Reacts all components simultaneously in real-time.
Processes a fixed amount of reactants in a closed system.
In a mole balance, what does the accumulation term represent?
The accumulation term represents the change in the amount of substance within a system over time.
The accumulation term reflects the pressure changes within the system.
The accumulation term shows the rate of reaction occurring in the system.
The accumulation term indicates the total mass flow into the system.
What assumption is made regarding the mixing of reactants in a batch and Continuous Stirred Tank Reactor (CSTR) reactors?
The mixing is only partial, affecting the reaction rate.
The reactants are not mixed, resulting in concentration gradients.
The mixing is dependent on the temperature of the reactor.
The reactants are perfectly mixed, leading to uniform concentration throughout the reactor.
In the context of a PFR, what does the term 'plug flow' imply about the velocity profile of the fluid?
The velocity is highest at the walls of the reactor.
The velocity decreases towards the center of the reactor.
The velocity profile is turbulent and varies with time.
The velocity is uniform across the entire cross-section of the reactor.
What assumption is typically made about the heat transfer in a PBR (Packed Bed Reactor)?
Heat transfer is assumed to occur only at the inlet of the reactor.
Heat transfer is assumed to be negligible compared to reaction heat.
Heat transfer is assumed to be uniform throughout the packed bed.
Heat transfer is instantaneous and does not affect the reaction rate.
