Disc 3

Question 1

For a gas modeled as an ideal gas, Cv = Cp + R, where r is the gas constant for the Gus

Answer 1

False,Cp= Cv + R

Question 2

Air can always be regarded as a pure substance

Answer 2

False, only true if it remains a gas

Question 3

Atmospheric air is normally modeled as an ideal gas

Answer 3

True

Question 4

For liquid water, the approximation v(T,p) = Vf(T) is reasonable for many engineering applications

Answer 4

True, v does not change much

Question 5

If superheated water vapor at 30MPa is cooled at constant pressure, it will eventually become saturated vapor, with sufficient additional cooling condensation to Saturated liquid will occur

Answer 5

False, p > critical pressure

Question 6

A poly tropic process with n=k is adiabatic

Answer 6

True

Question 7

For simple compressible systems, any two intensive thermodynamic properties fix the state

Answer 7

True

Question 8

For gases modeled as ideal gases, the ratio Cv / Cp must be greater than one

Answer 8

False