Fundamentals of Engineering Fluid Mechanics and Thermodynamics 2

Question 1

For an ideal gas, which equation relates pressure, volume, temperature, and number of moles?

Accepted Answer

PV = nRT

Answer

The ideal gas law PV = nRT relates pressure P, volume V, moles n, ideal gas constant R, and temperature T.

Question 2

What is the Carnot efficiency of a heat engine operating between temperatures T_H = 800 K and T_C = 400 K?

Accepted Answer

50%

Answer

Carnot efficiency η = 1 - T_C/T_H = 1 - 400/800 = 0.50 = 50%.

Question 3

Which fluid property describes resistance to shear deformation (resistance to flow)?

Accepted Answer

Dynamic viscosity

Answer

Dynamic viscosity μ is the property that quantifies a fluid's resistance to shear stress and flow.

Question 4

What is head loss due to friction in a pipe best described by?

Accepted Answer

Darcy-Weisbach equation

Answer

The Darcy-Weisbach equation h_f = f(L/D)(V²/2g) gives the friction head loss in a pipe.

Question 5

What happens to the entropy of a system during a reversible adiabatic process?

Accepted Answer

It remains constant

Answer

A reversible adiabatic (isentropic) process has no heat transfer and no irreversibilities, so entropy remains constant.

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