1. Please circle item(s) which is (are) intensive properties:

A) Pressure

B) The specific internal energy (kJ/kg) of water contained in a hot tank;

C) Total internal energy (kJ) of water contained in a tank;

D) Quality x of the saturated liquid-vapor mixture contained in a tank;

E) The density of water contained in a tank;

2. Please circle the item(s) which can be considered as pure substance in Thermodynamics:

A) Pure liquid water;

B) Mixture of liquid water and ice;

C) Air (Mixture of N2 and O2) at room temperature and atmosphere pressure;

D) Mixture of water and large amount of soil;

E) Mixture of water and minor amount of salt;

3. Please mark the region representing the superheated vapor:

A) Region A;

B) Region B;

C) Region C;

D) Region D;

E) None of above;

4. Please circle the valid statement(s) about compressed liquid at temperature T and pressure P:

A) T

B) P < Psat @T (the saturation pressure at given temperature T);

C) u = ug@T (specific internal energy);

D) f T v > v @ (specific volume);

E) x = 0.5 ;

5. Please circle the valid statement(s) about superheated vapor with temperature T and pressure P:

A) P > Psat@T ;

B) T > Tsat@P ;

C) V > V g@T(specific volume);

D) u < ug@T (specific internal energy);

E) h > hg@T (specific enthalpy);

6. A system contains water at 2.0 MPa, 220°C. The phase of this water is:

A) Compressed Liquid;

B) Liquid-vapor mixture;

C) Superheated Vapor

D) Solid (ice);

E) Cannot be determined based on information provided;