Answer :
Final answer:
Flow work per unit mass is given by pu is true and A constant temperature process is necessarily adiabatic is false. The flow work can be calculated using pressure and velocity, while a constant temperature process can occur with or without heat transfer, unlike an adiabatic process.
Explanation:
The provided statements can be classified as followed:
- Flow work per unit mass is given by pu. This statement is true. Flow work or flow energy is the work needed to push the fluid into or out of the control volume. For each unit mass m, the work needed to push it from the upstream location to the inlet of the system boundary is pu, where p is the pressure and u is the velocity. Therefore, the work per unit mass is indeed pu.
- A constant temperature process is necessarily adiabatic. This statement is false. An adiabatic process is one in which no heat transfer occurs. A constant temperature (isothermal) process, on the other hand, can have heat transfer. In fact, for an isothermal process, the system must be in contact with a heat source to allow heat to flow into the system. Hence, a process can be isothermal without being adiabatic.
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