First law of thermodynamics (fluid mechanics) - Quiz
  • 1. What is the first law of thermodynamics an expression of in physics?
A) Conservation of momentum
B) Conservation of total energy of a system
C) Conservation of mass
D) Conservation of entropy
  • 2. In the equation dEt = dQ + dW, what does Et represent?
A) Enthalpy transfer
B) Total energy of a system
C) External temperature
D) Elastic tension
  • 3. In the general thermodynamic equation, what does W represent?
A) Work done on the system
B) Wave propagation speed
C) Vorticity
D) Weight of the fluid
  • 4. In the general thermodynamic equation, what does Q represent?
A) Heat added to the system
B) Volume flow rate
C) Dynamic viscosity
D) Kinetic energy quotient
  • 5. What does the symbol sigma (mathbf{sigma}) represent in the fluid mechanics form of the first law?
A) Thermal conductivity
B) Specific heat
C) Surface tension
D) Cauchy stress tensor
  • 6. What does the symbol v (mathbf{v}) represent in the fluid mechanics form of the first law?
A) Vorticity vector
B) Kinematic viscosity
C) Specific volume
D) Flow velocity
  • 7. What does the symbol q (mathbf{q}) represent in the fluid mechanics form of the first law?
A) Momentum flux
B) Electric charge
C) Heat capacity
D) Heat flux vector
  • 8. What is the first law of thermodynamics in fluid mechanics sometimes referred to as?
A) Bernoulli principle
B) Momentum balance equation
C) Continuity equation
D) Energy balance equation of continuous media
  • 9. Which equations are derived using the first law of thermodynamics in fluid mechanics?
A) Laplace's equations
B) Ideal gas law equations
C) Euler equations of motion
D) Non-conservation form of the Navier–Stokes equations
  • 10. In the note section, what does the symbol p represent?
A) Power
B) Density
C) Potential energy
D) Pressure
  • 11. In the note section, what does the symbol I (mathbf{I}) represent?
A) Identity vector
B) Internal energy
C) Identity matrix
D) Inertia tensor
  • 12. In the note section, what does the symbol T (mathbf{T}) represent?
A) Temperature tensor
B) Total stress vector
C) Deviatoric stress tensor
D) Turbulence kinetic energy
  • 13. According to the note, how is stress defined with respect to pulling and pushing?
A) Pulling is negative stress and pushing is positive stress
B) Both pulling and pushing are negative stress
C) Both pulling and pushing are positive stress
D) Pulling is positive stress and pushing is negative stress
  • 14. What is the mathematical expression for the increase of the energy of a system according to the first law?
A) dE_t = dQ * dW
B) dE_t = dQ - dW
C) dE_t = dQ + dW
D) dE_t = dW - dQ
  • 15. What is the time-derivative form of the total energy increase in fluid mechanics?
A) dE_t / dx
B) DW / dt2
C) DE_t / Dt
D) dq / dt
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