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 1

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