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The term (u-Ts) is known as

  • A.Keenan function
  • B.free energy function
  • C.Gibb's function
  • D.Helmholtz function

Answer: D

The term \(u - Ts\) is the Helmholtz function, which is the Helmholtz free energy. The Gibbs function is \(h - Ts\), the Keenan function is the steady-flow availability \(h - T_0 s\), and so the key gives the Helmholtz function. Both Helmholtz and Gibbs functions are sometimes called free energy functions, but the specific one here is Helmholtz.

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