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Thermodynamics - AME 230 Student name
:
Date
: Homework Assignment No 4
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.
1
Thermodynamics - AME 230 A: True
B: False
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?
2
Thermodynamics - AME 230 Answer: 5.
A device in which power is developed as a result of a gas or liquid passing through a set of blades attached to a shaft free to rotate.
Answer:
6.
A device in which work is done on a gas to increase the pressure and/or elevation.
Answer:
7.
A device in which work is done on a liquid to increase the pressure and/or elevation.
Answer: 8.
A flow passage of varying cross-sectional area in which the velocity of a gas or liquid increases in the direction of flow.
Answer: 9.
A flow passage of varying cross-sectional area in which the velocity of a gas or liquid decreases in the direction of flow.
Answer: 10. A device where two moving fluid streams exchange heat without mixing.
Answer: 11. A flow-restricting device that causes a significant pressure drop in the fluid.
Answer: 3
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