4

T1/(T1-T2)

T2/(T1-T2)

T1/T2

T2/R1

A. T1/(T1-T2)

4

Isothermal

Isobaric

Isometric

4

The adiabatic throttling process of a perfect gas is one of constant enthalpy

In which there is a temperature drop

Which is exemplified by a non-steady flow expansion

Which can be performed in a pipe with a constriction

In which there is an increase in temperature

4

Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)

(atm)Δx, when Δx is negative

(atm)Δx, when Δx is positive

Dimensionless, when Δx = 0

(atm)Δx2, when Δx > 0

4

If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the

Maxwell's equation

Clausius-Clapeyron Equation

Van Laar equation

Nernst Heat Theorem

4

+ve

0

-ve

4

1

0

-ve

4

The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero

It is not possible to transfer heat from a lower temperature to a higher temperature

The total energy of system and surrounding remains the same

None of the above

4

Which of the following is an extensive property of a system?

Heat capacity

Molal heat capacity

Pressure

Concentration

4

Work done may be calculated by the expression ∫ p dA for __________ processes.

Non-flow reversible

Both (A) and (B)

Neither (A) nor (B)

4

Steam engine

Carnot engine

Diesel engine

Otto engine

4

Compressibility factor of a gas is

Not a function of its pressure

Not a function of its nature

Not a function of its temperature

Unity, if it follows PV = nRT

4

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Less pronounced

More pronounced

Equal

Data insufficient, can't be predicted

4

1

< 1

> 1

>> 1

4

Boiling of liquid is accompanied with increase in the

Vapor pressure

Specific Gibbs free energy

Specific entropy

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

4

Heat pump

Accomplishes only space heating in winter

Accomplishes only space cooling in summer

Accomplishes both (A) and (B)

Works on Carnot cycle

4

100,000 kW

160,000 kW

200,000 kW

320,000 kW

4

Solid and liquid phases of a substance are in equilibrium at the

Critical temperature

Melting point

Freezing point

Both (B) and (C)

4

In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

Enhanced COP

Decreased COP

No change in the value of COP

Increased or decreased COP; depending upon the type of refrigerant

4

PVy = constant, holds good for an isentropic process, which is

Reversible and isothermal

Isothermal and irreversible

4

Pick out the wrong statement.

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

Combustion reactions are never endothermic in nature

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

Clausius-Clapeyron equation is not applicable to melting process

4

Gibbs-Duhem

Maxwell's

Clapeyron

None of these

4

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

Entropy

Internal energy

Enthalpy

Gibbs free energy

4

Non-uniformly

Isobarically

Isothermally

4

RT d ln P

R d ln P

R d ln f

None of these

4

Pick out the wrong statement.

The chemical potential of a pure substance depends upon the temperature and pressure

The chemical potential of a component in a system is directly proportional to the escaping tendency of that component

The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature

The chemical potential of species 'i' in the mixture (μi) is mathematically represented as,μi = ∂(nG)/∂ni]T,P,nj where, n, ni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy

4

Pick out the wrong statement.

A closed system does not permit exchange of mass with its surroundings but may permit exchange of energy.

An open system permits exchange of both mass and energy with its surroundings

The term microstate is used to characterise an individual, whereas macro-state is used to designate a group of micro-states with common characteristics

None of the above

4

No

Any real

Only ideal

Both (B) and (C)

4

2.73

28.3

273

283

4

In an ideal gas mixture, fugacity of a species is equal to its

Vapor pressure

Partial pressure

Chemical potential

None of these