11. The mass rate balance is defined as the sum of all inlet mass flow rates minus the sum

of all outlet mass flow rates.

A: True

B: False

12. For one-dimensional flow, mass flow rate is the product of density, area, and velocity.

A: True

B: False

13. As velocity decreases in a diffuser, pressure decreases.

A: True

B: False

14. Flow work is the work done on a flowing stream by a paddle wheel or piston.

A: True

B: False

II. Checking understanding

1. The time rate of mass flow per unit area is called

Answer:

2.

means all properties are unchanging in time.

3. A system consists of liquid water in equilibrium with a gaseous mixture of air and

water vapor. How many phases are present? Does the system consist of a pure

substance? Explain.

Answer:

4. Does the red line in the picture below follow a constant pressure?