Higher Study | Thermodynamics | Availability and Irreversibility

Gibbs phase rule defines the relationship between degrees of freedom (F) of a system, number of phases (P) and the number of components (c). What is the equation?

ক

F + P = C

খ

F + P = C + 1

গ

F – P = C

ঘ

F + P = C + 2

Which of the following is CORRECT? [A = Helmholtz function (Helmholtz Free Energy), G = Gibbs function (Gibbs Free Energy), U = Internal energy, H = Enthalpy, T = Absolute temperature, S = Entropy]

ক

A = H - TS ; G = H + TS

খ

A = U - TS ; G = H - TS

গ

A = U + TS ; G = H - TS

ঘ

A = U - TS ; G = U + TS

Which one of the following parameters is significant to ascertain chemical equilibrium of a system?

ক

Clapeyron equation

খ

Maxwell relations

গ

Gibb's function

ঘ

Helmholtz function

Which one of the following represents unavailability?

ক

To(ΔSo)

খ

T(ΔS)

গ

To(ΔS)

ঘ

T(ΔSo)

Consider the following processes: 1. Extension of a spring 2. Plastic deformation of a material 3. Magnetization of a material exhibiting hysteresis Which of the above processes are irreversible?

ক

1 and 2 only

খ

1 and 3 only

গ

2 and 3 only

ঘ

1, 2 and 3

Consider the following statements regarding availability: 1) Is generally conserved 2) It can either be negative or positive 3) It is the maximum theoretical work obtainable 4) It can be destroyed in irreversibility Which of the above statements are correct?

ক

3 and 4

খ

1 and 2

গ

1 and 3

ঘ

2 and 4

For irreversible process, which relation is correct?

ক

loss of exergy is indirectly proportional to rate of entropy generation

খ

loss of exergy is directly proportional to rate of entropy generation

গ

loss of exergy has no relation with rate of entropy generation

ঘ

loss of exergy is equals to rate of entropy generation