I. Indicate whether the following statements are true or false

1. Mass flux is the time rate of mass flow per unit area.

A: True

B: False

2. For steady-state operation all properties are unchanging in time.

A: True

B: False

3. Mass flow rate is the product of density, area, and velocity for 1D flow.

A: True

B: False

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

A: True

B: False

5. Volumetric flow rate is expressed in units of kg/s.

A: True

B: False

6. At steady state, conservation of mass asserts the total rate at which mass enters the

control volume equals the total rate at which mass exits.

A: True

B: False

7. A mixing chamber is a direct-contact heat exchanger

A: True

B: False

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

A: True

B: False

9. For a one-inlet, one-exit control volume at steady state, the mass flow rates at the inlet

and exit are equal but the inlet and exit volumetric flow rates may not be equal.

A: True

B: False

10. Mass flow rate is the time rate of change of mass within the control volume.

A: True

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