Week 4: Fundamentals and Sustainability Concepts in Environmental Engineering

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Questions and Answers

What would be the consequence of the absence of atmosphere on Earth's surface?

  • There would be no effect on the temperature
  • The temperature would be cooler than today (correct)
  • The temperature would be hotter than today
  • The temperature would be constant

Which of the following is NOT a characteristic of a greenhouse gas?

  • It traps heat in the atmosphere
  • It is a noble gas (correct)
  • It has a significant impact on climate change
  • It is present in the atmosphere in small concentrations

What is the unit of the rate constant (k) in the formula for first-order reaction kinetics in CSTR?

  • Unitless
  • Volume per unit time
  • Time per unit volume
  • Concentration per unit time (correct)

What is the main assumption of a plug flow reactor?

<p>There is no axial mixing (D)</p> Signup and view all the answers

Which of the following is a correct statement about the temperature of Earth's surface?

<p>It is a complex function of atmospheric and other factors (A)</p> Signup and view all the answers

What is the primary unit of measurement for mass flux?

<p>Kilograms per unit area (C)</p> Signup and view all the answers

What is the key assumption in a completely mixed batch reactor (CMBR)?

<p>The reactants are fully mixed and uniform throughout the reactor (C)</p> Signup and view all the answers

What is the correct formula for gravitational potential energy?

<p>Mass × change in height (D)</p> Signup and view all the answers

What is the term for the rate of change of mass with respect to time in a CMBR?

<p>dm/dt (B)</p> Signup and view all the answers

What is the purpose of the term ḿreact in the governing equation for a CMBR?

<p>To account for the reaction occurring within the reactor (C)</p> Signup and view all the answers

What is the significance of the net mass change term in the governing equation for a CMBR?

<p>It represents the balance between mass input and output (D)</p> Signup and view all the answers

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