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

B. The inversion temperature is different for different gases

4

# With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure

Increases

Decreases

Remain same

Decreases linearly

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

4

100,000 kW

160,000 kW

200,000 kW

320,000 kW

4

# A solute distributes itself between two nonmiscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount. This is

The distribution law

Followed from Margules equation

A corollary of Henry's law

None of these

4

V/T = Constant

V ∝ 1/T

V ∝ 1/P

PV/T = Constant

4

Volume

Temperature

Pressure

None of these

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

Zeroth

First

Second

Third

4

# Pick out the wrong statement.

A refrigeration cycle violates the second law of thermodynamics

Refrigeration cycle is normally represented by a temperature vs. entropy plot

In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases

One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

4

# What happens in a reversible adiabatic compression?

Heating occurs

Cooling occurs

Pressure is constant

Temperature is constant

4

# If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

Process must be isobaric

Temperature must decrease

Both (B) and (C)

4

# An ideal liquid refrigerant should

Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils

Not have unduly high vapour pressure at the condenser temperature

Both (A) and (B)

Have low specific heat

4

Enthalpy

Pressure

Entropy

None of these

4

# Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor?

d ln p/dt = Hvap/RT2

d ln p/dt = RT2/Hvap

dp/dt = RT2/Hvap

dp/dt = Hvap/RT2

4

# For organic compounds, group contribution method can be used for the estimation of

Critical properties

Specific gravity

Specific volume

Thermal conductivity

4

RT d ln P

RT d ln f

R d ln f

None of these

4

50 kcal/hr

200 BTU/hr

200 BTU/minute

200 BTU/day

4

# Internal energy of an ideal gas

Increases with increase in pressure

Decreases with increase in temperature

Is independent of temperature

None of these

4

Solution

Formation

Dilution

Combustion

4

# Pick out the wrong statement.

Trouton's ratio of non-polar liquids is calculated using Kistyakowsky equation

Thermal efficiency of a Carnot engine is always less than 1

An equation relating pressure, volume and temperature of a gas is called ideal gas equation

None of these

4

6738.9

6753.5

7058.3

9000

4

Volume

Pressure

Temperature

All a, b & c

4

# Which is an example of closed system?

Air compressor

Liquid cooling system of an automobile

Boiler

None of these

4

Pressure

Solubility

Temperature

None of these

4

# In a homogeneous solution, the fugacity of a component depends upon the

Pressure

Composition

Temperature

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

4

# A Carnot cycle consists of the following steps:

Two isothermal and two isentropic

Two isobaric and two isothermal

Two isochoric and two isobaric

Two isothermals and two isochoric

4

Zeroth

First

Second

Third

4

RT ln K

-RT ln K

-R ln K

T ln K

4

# Pick out the wrong statement.

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

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

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

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