4

< 0

> 0

= 0

None of these

A. < 0

4

# Cp of a gas at its critical temperature and pressure

Becomes zero

Becomes infinity

Equals 1 kcal/kmol °K

Equals 0.24 kcal/kmol °K

4

# __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.

Bucket

Throttling

Separating

A combination of separating & throttling

4

Temperature

Pressure

Volume

Entropy

4

# The quantitative effect of temperature on chemical equilibrium is given by the

Vant-Hoff equation

Le-Chatelier's principle

Arrhenius equation

None of these

4

# In any spontaneous process, the __________ free energy decreases.

Helmholtz

Gibbs

Both a & b

Neither 'a' nor 'b'

4

Fusion

Vaporisation

Transition

None of these

4

# The standard Gibbs free energy change of a reaction depends on the equilibrium

Pressure

Temperature

Composition

All (A), (B) and (C)

4

# An isentropic process is carried out at constant

Volume

Pressure

Temperature

All (A), (B) and (C)

4

# The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

Internal energy

Enthalpy

Gibbs free energy

Helmholtz free energy

4

ds = 0

ds <0

ds > 0

ds = Constant

4

Low T, low P

High T, high P

Low T, high P

High T, low P

4

# Heat of formation of an element in its standard state is

0

< 0

> 0

A function of pressure

4

Isothermal

Isobaric

Isochoric

4

√(2KT/m)

√(3KT/m)

√(6KT/m)

3KT/m

4

Entropy

Temperature

Internal energy

Enthalpy

4

# The principle applied in liquefaction of gases is

Joule-Thomson effect

Both (A) and (B)

Neither (A) nor (B)

4

# When a gas is expanded from high pressure region to low pressure region; temperature change occurs. This phenomenon is related to the

Gibbs-Duhem equation

Gibbs-Helmholtz equation

Third law of thermodynamics

Joule-Thomson effect

4

# Internal energy change of a system over one complete cycle in a cyclic process is

Zero

+ve

-ve

Dependent on the path

4

3

2

1

0

4

# The equation DU = Tds - PdV is applicable to infinitesimal changes occuring in

An open system of constant composition

A closed system of constant composition

An open system with changes in composition

A closed system with changes in composition

4

# Which is an example of closed system?

Air compressor

Liquid cooling system of an automobile

Boiler

None of these

4

# As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

Not changed

Decreasing

Increasing

Data sufficient, can't be predicted

4

# When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

More in vapour phase

More in liquid phase

Same in both the phases

Replaced by chemical potential which is more in vapour phase

4

# The gas law (PV = RT) is true for an __________ change.

Isothermal

Both (A) & (B)

Neither (A) nor (B)

4

# Which of the following will increase the volume of a real gas by four times?

Doubling the absolute temperature as well as pressure of the gas

Reducing pressure to one fourth at constant temperature

Reducing temperature to one fourth at constant pressure

Reducing the temperature to half and doubling the pressure

4

# Pick out the wrong statement.

The values of (∂P/∂V)T and (∂2P/∂V2)T are zero for a real gas at its critical point

Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process

Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures

During a reversible adiabatic process, the entropy of a substance remains constant

4

# The value of gas constant 'R' is

1.987 cal/gm mole °K

1.987 BTU/lb. mole °R

Both (A) and (B)

Neither (A) nor (B)

4

Freezing

Triple

Boiling

Boyle

4

# Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

Entropy

Internal energy

Enthalpy

Gibbs free energy