Which of the following statements is true: In an ideal gas the pressure plays an

Question

Which of the following statements is true: In an ideal gas the pressure plays an important role in determining the maximum volumetric flowrate a pipe can hold At sub-sonic speeds, the velocity increases with increasing area. For a constant diameter pipe, it is possible to accelerate the fluid beyond the speed of sound. At sub-sonic speeds, the velocity decreases with increasing area. In a momentum balance, the net generation term is: Zero when no forces are exerted on the system boundary. Zero when the system mass is constant. Zero when no mass is flowing into the system. Zero at steady state. In real world, when water hammering occurs: The pressure inside the pipe rises to infinity The velocity rises to infinity. The derivative of the velocity with respect to time approaches negative infinity. The pressure rise inside the pipe is finite.

Explanation / Answer

5) D

At sub-sonic speeds, an increase in area -decreases the speed of flow.

At super-sonic speeds, an increase in area -increases the speed of flow.

7) A

Water hammering is a destructive force relate to incompressibility of water.

Water hammering is the sudden pressure rise.

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