Flow Work and Energy Balance
1 / 10
The First Law for open systems emphasizes:
Explanation: Open system energy balance uses enthalpy to account for flow work. Internal energy is key in closed systems; entropy and volume are secondary.
2 / 10
Flow work is significant in which device?
Explanation: Compressors involve flow work as fluid is pushed in/out under pressure. Piston-cylinders and rigid tanks are closed; isolated systems have no work.
3 / 10
In a nozzle, the energy balance typically increases:
Explanation: Nozzles convert enthalpy into kinetic energy, accelerating fluid with no shaft work. Potential energy and enthalpy changes are secondary.
4 / 10
The energy balance equation accounts for:
Explanation: The steady-flow equation includes enthalpy (with flow work), kinetic, and potential energy terms. Heat and work are inputs/outputs, not stored energies.
5 / 10
Flow work is zero in:
Explanation: Closed systems have no mass flow, so flow work doesn’t occur. Pumps, nozzles, and turbines involve flow work due to fluid movement.
6 / 10
In a turbine, the energy balance primarily involves:
Explanation: Turbines convert fluid enthalpy into shaft work, often with negligible heat transfer. Potential energy and internal energy are less dominant in steady flow.
7 / 10
The steady-flow energy equation applies to:
Explanation: The steady-flow equation balances energy in systems with mass flow, like nozzles. Closed or isolated systems use different First Law forms.
8 / 10
Enthalpy includes:
 Enthalpy combines internal energy and flow work. Kinetic energy is separate in energy balance equations.
9 / 10
Flow work per unit mass is:
Explanation: Flow work is pressure times specific volume, pushing fluid across boundaries. It’s part of enthalpy, distinct from internal energy or heat/work terms.
10 / 10
Flow work is associated with:
Explanation: Flow work occurs when fluid enters or exits an open system, like a turbine. Closed, isolated, or rigid systems don’t involve mass flow.
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