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This mock test of Test: Thermodynamic Relations - 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
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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 P_{1} / P_{2} = (T_{1} / T_{2})^{(η / η - 1)}

P_{2} = 5 x (500 / 320)^{1.4 / 0.4 }

≅ 23.8 bar.

QUESTION: 2

Average coefficient of volume expansion of a substance is denoted by

Solution:

QUESTION: 3

A gas having a negative Joule-Thomson coefficient ( μ_{j} < 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:

### Thermodynamic Relations

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