The relationship between specific heats Cp - Cv for an ideal gas is:

The correct answer is A: Cp - Cv = R. Mayer's relation: Cp - Cv = R (per mole). This is fundamental for ideal gases.

The continuity equation for incompressible flow states that:

The correct answer is A: A₁V₁ = A₂V₂. The continuity equation for incompressible flow is based on mass conservation: ρA₁V₁ = ρA₂V₂, which simplifies to A₁V₁ = A₂V₂ when density is constant.

The dryness fraction of a wet steam sample is 0.8. If specific enthalpy of saturated liquid and vapor at a pressure are 500 kJ/kg and 2700 kJ/kg respectively, the specific enthalpy of the mixture is:

The correct answer is B: 1760 kJ/kg. h = h_f + x × h_fg = 500 + 0.8 × (2700 - 500) = 500 + 0.8 × 2200 = 500 + 1760 = 2260 kJ/kg. Correction: h = h_f + x(h_g - h_f) = 500 + 0.8(2700-500) = 1760 kJ/kg

Which of the following is a dimensionless number used in fluid mechanics that compares inertial forces to surface tension forces?

The correct answer is A: Weber number. Weber number We = ρV²D/σ represents the ratio of inertial to surface tension forces. It's important in two-phase flows and atomization studies.

Which of the following is an intensive property in thermodynamics?

The correct answer is A: Temperature. Temperature is an intensive property as it does not depend on the quantity of matter. Mass, volume, and weight are extensive properties.