4

# Dry ice is

Moisture free ice

Solid helium

Solid carbon dioxide

None of these

C. Solid carbon dioxide

4

# (∂T/∂P)H is the mathematical expression for

Specific heat at constant pressure (Cp)

Specific heat at constant volume (Cv)

Joule-Thompson co-efficient

None of these

4

Cv.dT

Cp.dT

∫ Cp.dT

∫ Cv.dT

4

# In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respectively, the Carnot COP will be

5.2

6.2

0.168

Data insufficient, can't be found out

4

Steam engine

Carnot engine

Diesel engine

Otto engine

4

349

651

667

1000

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

# The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture. This is

The statement as per Gibbs-Helmholtz

Called Lewis-Randall rule

Henry's law

None of these

4

35 K

174 K

274 K

154 K

4

1

< 1

> 1

>> 1

4

# Which one is true for a throttling process?

A gas may have more than one inversion temperatures

The inversion temperature is different for different gases

The inversion temperature is same for all gases

The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

4

# With increase in temperature, the internal energy of a substance

Increases

Decreases

Remains unchanged

May increase or decrease; depends on the substance

4

# Mollier diagram is a plot of

Temperature vs. enthalpy

Temperature vs. enthalpy

Entropy vs. enthalpy

Temperature vs. internal energy

4

# The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

(R/ΔH) (1/T1 - 1/T2)

(ΔH/R) (1/T1 - 1/T2)

(ΔH/R) (1/T2 - 1/T1)

(1/R) (1/T1 - 1/T2)

4

Ideal

Real

Isotonic

None of these

4

# To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the

Volume of the liquid phase is negligible compared to that of vapour phase

Vapour phase behaves as an ideal gas

Heat of vaporisation is independent of temperature

All (A), (B) & (C)

4

100

50

205

200

4

Pressure

Volume

Mass

None of these

4

# Entropy, which is a measure of the disorder of a system, is:

Independent of pressure

Independent of temperature

Zero at absolute zero temperature for a perfect crystalline substance

All (A), (B) & (C)

4

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

Zero

+ve

-ve

Dependent on the path

4

Pressure

Solubility

Temperature

None of these

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

# When pressure is applied on the system, ice ↔ water, then

Equilibrium cannot be established

More ice will be formed

More water will be formed

Evaporation of water will take place

4

Isothermal

Isobaric

Polytropic

4

50 kcal/hr

200 BTU/hr

200 BTU/minute

200 BTU/day

4

# Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be

580

640

1160

Data insufficient; can't be computed

4

# Pick out the wrong statement

Phase rule variables are intensive properties

Heat and work are both state function

The work done by expansion of a gas in vacuum is zero

CP and CV are state function

4

0

1

2

3

4

Volume

Temperature

Pressure

None of these

4

# Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

Calorific value

Heat of reaction

Heat of combustion

Heat of formation