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