Multiple choice _For a steady - flow control volume device. the following statem
ID: 1818785 • Letter: M
Question
Multiple choice _For a steady - flow control volume device. the following statement is invalid. The volume, mass, and total energy of the control - volume remains constant with time. The properties such as temperature and pressure must be uniform ( identical ) throughout the space of the control volume. Energy can transfer across the boundary of the control volume. Mass can transfer across the boundary of the control volume. _For compressors and turbines, the following statement is always valid delta KE 0 delta PE 0 _For control volume systems, the following statement is invalid A transient - flow device is one of time varying condition. The law of "conservation of mass" is applicable to both steady and unsteady - flow systems. Steady - flow systems are fixed in space, size and shape while unsteady - flow systems are not. The law of "conservation of energy" is applicable to both steady and unsteady - flow systems. _A fluid enters a nozzle. The specific flow work ( kj / kg ) required to move this fluid through the nozzle entrance is given by: Pv AV 1 / 2 / v2 gh _Which statement is invalid regarding a uniform - flow process? The fluid properties are constant with time and location over the cross section of an inlet or exit. The fluid inside the control volume always remain constant with time. The fluid properties may be averaged over the cross section of an inlet or exit. The fluid flow at any inlet or exit is uniform and steady. _For heat exchangers, we generally Assume isothermal conditions within the exchanger. Assume adiabatic conditions at the exchanger boundary. Include mechanical work within the exchanger. Include potential energy effects between the inlets and outlets.Explanation / Answer
a.B b.B c.C d.A e.C
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