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
Fig: 1