# Test: Thermodynamic Relations - 1

## 10 Questions MCQ Test Thermodynamics | Test: Thermodynamic Relations - 1

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Attempt Test: Thermodynamic Relations - 1 | 10 questions in 30 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Thermodynamics for Mechanical Engineering Exam | Download free PDF with solutions
QUESTION: 1

### For an isentropic flow along a nozzle, at location A, the static temperature and pressure were measured to be 320 K and 5 bar. What will be the static pressure at the location where the static temperature is 500 K? (Given η = 1.4)

Solution:

For the isentropic flow, adiabatic relations can be applied (isentropic means reversible as well as adiabatic).
Then using P1 / P2 = (T1 / T2)(η / η - 1)
P2 = 5 x (500 / 320)1.4 / 0.4
≅ 23.8 bar.

QUESTION: 2

Solution:
QUESTION: 3

### A gas having a negative Joule-Thomson coefficient ( μj < 0), when throttled, will

Solution:

QUESTION: 4

The Clausius-Clapeyron equation gives the slope of curve on

Solution:

QUESTION: 5

Consider the following statements pertaining to the Clapeyron equation:
1. It is useful in estimating properties like enthalpy from other measurable properties.
2. At a change of phase, it can be used to find the latent heat at a given pressure.
3. It is derived from the relationship

Which of the statements given above are correct?

Solution:
QUESTION: 6

What is the unit of Gibbs free energy?

Solution:

Gibbs free energy is defined as the thermodynamic potential that is used to calculate the maximum amount of reversible work. It takes place at a constant pressure and temperature. The SI unit is Joule.

QUESTION: 7

At chemical equilibrium, Gibbs function is

Solution:

(dG)T,P = 0 (equilibrium condition)

QUESTION: 8

Which of the following parameter is.the criterion of equilibrium and stability of a system existing at constant volume and constant temperature?

Solution:

QUESTION: 9

The internal energy of an ideal gas is a function of

Solution:

For an ideal Gas
U = f(T) only

QUESTION: 10

Solution:

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