Chemical Engineering Thermodynamics MCQs

Question 1

In the equation PVn = constant, if the value of $${	ext{n}} = \gamma = \frac{{{{	ext{C}}_{	ext{P}}}}}{{{{	ext{C}}_{	ext{V}}}}},$$ then it represents a reversible __________ process.

Accepted Answer

Isentropic

Answer

Isothermal

Answer

Adiabatic

Answer

Polytropic

Question 2

Pick out the wrong statement.

Accepted Answer

The fugacity co-efficient is zero for an ideal gas

Answer

Activity co-efficient is dimensionless

Answer

In case of an ideal gas, the fagacity is equal to its pressure

Answer

In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component

Question 3

Pick out the wrong statement.

Accepted Answer

The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state

Answer

Cp of monoatomic gases such as metallic vapor is about 5 kcal/kg. atom

Answer

There is an increase in entropy, when a spontaneous change occurs in an isolated system

Answer

At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

Question 4

In the equation, PVn = constant, if the value of n is in between 1 and y $$\left( {{	ext{i}}{	ext{.e}}{	ext{., }}\frac{{{{	ext{C}}_{	ext{P}}}}}{{{{	ext{C}}_{	ext{V}}}}}} ight),$$ then it represents a reversible __________ process.

Accepted Answer

Polytropic

Answer

Isometric

Answer

Isentropic

Answer

Isobaric

Question 5

In the equation, PVn = constant, if the value of $${	ext{n}} = \pm \infty ,$$ then it represents a reversible __________ process.

Accepted Answer

Isometric

Answer

Adiabatic

Answer

Isentropic

Answer

Isothermal

Question 6

Which of the following is not correct for a reversible adiabatic process?

Accepted Answer

None of these

Answer

$${	ext{T}}{{	ext{V}}^{\gamma - 1}}$$ = constant

Answer

$${{	ext{P}}^{1 - \gamma }}.{{	ext{T}}^{	ext{Y}}}$$ = constant

Answer

$${	ext{P}}{{	ext{V}}^\gamma }$$ = constant

Question 7

Requisites of a reversible process is that the

Accepted Answer

Friction in the system should be absent

Answer

System and surroundings pressure be equal

Answer

System and surroundings temperature be equal

Answer

None of these

Question 8

Pick out the wrong statement.

Accepted Answer

Claussius-clayperon equation is not applicable to melting process

Answer

Enthalpies of all elements in their standard states are assumed to be zero

Answer

Combustion reactions are never en-dothermic in nature

Answer

Heat of reaction at constant volume is equal to the change in internal energy

Question 9

The kinetic energy of gas molecule is zero at

Accepted Answer

-273°C

Answer

0°C

Answer

273°C

Answer

100°C