A steady-state process involves mixing two streams of a 20 wt% NaOH solution with a 50 wt% NaOH solution. If 100 kg/hr of the 20 wt% solution is mixed with 50 kg/hr of the 50 wt% solution, what is the weight percent of NaOH in the final mixed stream?
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According to the First Law of Thermodynamics, which of the following statements is true for a closed system undergoing a process?
Question · Medium
Introduction & Exam Overview
1.1 Current Exam Facts and Format
Study guide
In a horizontal pipe of varying cross-section, where the fluid is incompressible and flows steadily, how does the velocity of the fluid change when it flows from a wider section to a narrower section?
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Which of the following reactor types is generally preferred for very high conversion of reactants with relatively low reaction rates?
What is the primary objective of conducting a Hazard and Operability (HAZOP) study in a chemical plant?
Which of the following best describes the principle behind the separation process of distillation?
1.2 Registration, Eligibility, Grades, and Renewal
Consider the reaction: 2A + B -> C. If 4 moles of A and 3 moles of B are initially present, and the reaction goes to completion, what is the limiting reactant and how many moles of C are formed?
For a binary ideal solution at constant temperature and pressure, which statement regarding the partial molar Gibbs free energy of component i (μ_i) is correct?
Question · Hard
What is the primary mechanism of heat transfer through a solid wall when there is no fluid motion within the wall itself?
For a first-order irreversible reaction A -> Products in a batch reactor, which expression correctly relates the concentration of A (C_A) at time t to its initial concentration (C_A0) and the rate constant (k)?
1.3 Study Strategy and Exam-Day Tactics
Which type of control valve action describes a valve that closes upon loss of instrument air pressure?
A liquid stream of 200 kg/hr at 25°C is heated to 85°C. The specific heat capacity of the liquid is 3.5 kJ/(kg·°C). Neglecting heat losses, what is the heat required for this process?
A pump is used to transfer water (density = 1000 kg/m³) from an open tank to a height of 10 m at a flow rate of 0.05 m³/s. The inlet and outlet pipes have the same diameter. Neglecting friction losses, what is the minimum power required by the pump?
Which thermodynamic property is a measure of the disorder or randomness of a system?
Stoichiometry & Process Calculation Foundations
2.1 Units, Bases, and Process Variables
In mass transfer operations, which process involves the selective transfer of one or more soluble components from a gas mixture into a liquid solvent, typically by contacting the gas with the liquid in a packed or tray column?
A reaction has an activation energy of 50 kJ/mol. If the temperature is increased from 300 K to 310 K, approximately how many times does the reaction rate constant increase, assuming an ideal Arrhenius behavior?
Which class of fire involves flammable liquids and gases, such as gasoline, oil, and propane?
What is the equivalent pressure of 2 atmospheres (atm) in Pascals (Pa)? (Given: 1 atm = 101325 Pa)
2.2 Stoichiometry, Limiting and Excess Reactants
Which equation relates the chemical potential of a component in a real gas mixture to its mole fraction and a correction factor for non-ideal behavior?
A counter-current double-pipe heat exchanger is used to cool 10 kg/s of hot oil from 150°C to 80°C. Water enters at 20°C and leaves at 60°C. If the specific heat capacities are C_p,oil = 2.0 kJ/(kg·°C) and C_p,water = 4.18 kJ/(kg·°C), calculate the logarithmic mean temperature difference (LMTD) for this heat exchanger.
A counter-current double-pipe heat exchanger is used to cool hot oil. The hot oil enters at 120°C and leaves at 75°C. Cooling water enters at 25°C and leaves at 60°C. Calculate the logarithmic mean temperature difference (LMTD) for this heat exchanger.
Which of the following describes a key characteristic of selectivity in multiple chemical reactions?
2.3 Batch vs Continuous and Steady vs Unsteady Operation
A transducer in an instrumentation system primarily performs which function?
A reactor feed stream contains 20% methane, 30% ethane, and 50% propane by mole. If the total molar flow rate is 100 mol/s, what is the molar flow rate of ethane?
Which of the following statements about the Carnot cycle is true?
In the context of process control, what is the primary role of the proportional (P) term in a PID controller?
Material Balances
3.1 Steady Material Balances Without Reaction
What is the primary function of a reflux condenser in a distillation column?
In chemical reaction engineering, which parameter is typically maximized to achieve high product yields in parallel reactions where one reaction forms the desired product and another forms an undesired product?
A project manager for a new chemical plant expansion project needs to define the scope, budget, and schedule. Which Project Management Professional (PMP) knowledge area is primarily concerned with establishing these foundational elements?
For a horizontal pipe of varying cross-section, how does the velocity of an incompressible fluid relate to the pressure according to Bernoulli's principle?
3.2 Material Balances With Chemical Reaction
Which of the following thermodynamic properties is a measure of the 'useful' or process-initiating work obtainable from an isothermal, isobaric thermodynamic system?
What is the primary purpose of a Hazard and Operability (HAZOP) study in process safety?
For a first-order irreversible reaction A -> B occurring in a batch reactor, how does the concentration of reactant A change over time?
A distillation column separates a feed of 40 mol% benzene and 60 mol% toluene. The distillate is 95 mol% benzene, and the bottoms product is 5 mol% benzene. If the feed rate is 100 kmol/hr, what is the approximate flow rate of the distillate product?
3.3 Recycle, Bypass, and Purge Systems
A reaction involves 100 mol of A and 150 mol of B with the stoichiometry A + 2B -> C. Which reactant is limiting, and what is the maximum theoretical yield of C?
Which of the following materials is typically chosen for its high thermal conductivity in heat exchanger applications?
A PID controller is tuned to achieve a desired process response. What does the 'I' component of the PID controller primarily address?
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