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This mock test of Properties Of Gases - 3 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam.
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QUESTION: 1

The characteristic equation of gases PV = mRT holds good for

Solution:

Pv= mRT is known as ideal gas equation.

QUESTION: 2

A gas which obeys kinetic theory perfectly is known as

Solution:

QUESTION: 3

Variation of pressure and volume at constant temperature are correlated through

Solution:

As per Boyle’s law

At constant temperature

PV = Constant

QUESTION: 4

Polytropic index n is given by

Solution:

QUESTION: 5

The work given out during expansion process in a closed system will increase when the value of n (the index of expansion)

Solution:

For n = ∞ ⇒ w = 0

⇒ (isochoric process)

for n = 0

⇒ w = max

⇒ (isobaric process)

Hence with increase in index of expansion work decreases.

QUESTION: 6

The work required for compression in a closed system increases the value of n (the index of compression)

Solution:

QUESTION: 7

In thermodynamics analysis, a pure substance is that which

Solution:

QUESTION: 8

Which one of the following PV - T diagram correctly represents that of an ideal gas?

Solution:

QUESTION: 9

If and for a thermodynamic system of an ideal gas on evaluation give the same quantify during a process, then the process under gone by the system is

Solution:

For isothermal process,

PV = Constant

PdV + VdP = 0

∵ PdV = - VdP

∴

QUESTION: 10

A vessel of volume 1m^{3} contains oxygen (molecular weight = 32) at P = 1 bar and T = 47°C. The mass of oxygen in the vessel is (take universal gas constant as 8314 J/mol-K)

Solution:

QUESTION: 11

Nitrogen at an initial state of 10 bar, 1 m^{3}, and 300 K is expanded isothermally to a final volume of 2m^{3}. The p-v-T relation is , where a > 0. The final pressure.

Solution:

For isothermal process

Hence final pressure will be slightly more than 5 bar as a is + ve.

QUESTION: 12

Which combination of the following statements is correct?

P : A gas cools upon expansion only when its Joule-Thomson coefficient is positive in the temperature range of expansion.

Q : For a system undergoing a process, its entropy remains constant only when the process is reversible.

R : The work done by a closed system in an adiabatic is a point function S : A liquid expands upon freezing when the slope of its fusion curve on pressure-temperature diagram is negative.

Solution:

QUESTION: 13

Van der Waal’s equation of state is given by

The value of R in terms of P_{c}, V_{c} & T_{c} is

Solution:

QUESTION: 14

The equation of state

is known as

Solution:

Virial expansion is given as

QUESTION: 15

An ideal gas undergoes expansion according to the process PV^{0.5} = constant. The temperature of'the gas during expansion process

Solution:

∴

for expansion process, V_{2 }> V_{1}

as

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