Q.1
Pick out the wrong statement.
Q.2
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
Q.3
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is
Q.4
For a spontaneous process, free energy
Q.5
A large iceberg melts at the base, but not at the top, because of the reason that
Q.6
Joule-Thomson co-efficient depends on the
Q.7
In Joule-Thomson porous plug experiment, the
Q.8
Entropy, which is a measure of the disorder of a system is
Q.9
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
Q.10
One ton of refrigeration capacity is equivalent to the heat removal rate of
Q.11
In jet refrigerators, the refrigerating fluid is practically always
Q.12
High __________ is an undesirable property for a good refrigerant.
Q.13
Joule-Thomson Co-efficient at any point on the inversion curve is
Q.14
Internal energy of an ideal gas
Q.15
In an ideal refrigeration cycle, the change in internal energy of the fluid is
Q.16
In the reaction; N₂ + O₂ ⇋ 2NO, increasing the pressure will result in
Q.17
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is
Q.18
In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants )
Q.19
Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.
Q.20
For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.
Q.21
What is the ratio of adiabatic compressibility to isothermal compressibility?
Q.22
Which of the following non-flow reversible compression processes require maximum work?
Q.23
What is the value of Joule-Thomson co-efficient for an ideal gas?
Q.24
Which of the following equations is used for the prediction of activity co-efficient from experiments?
Q.25
The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x₁. x₂, where A is a constant. The corresponding equation for ln y₁, where y₁ is the activity co-efficient of component 1, is
Q.26

The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.

  • kinematic viscosity
  • work
  • temperature
  • none of these
Q.27

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?

  • Vapor compression cycle using expansion valve.
  • Air refrigeration cycle.
  • Vapor compression cycle using expansion engine.
  • Carnot refrigeration cycle.
Q.28

Equilibrium constant decreases as the temperature

  • increases, for an exothermic reaction.
  • decreases, for an exothermic reaction.
  • increases, for an endothermic reaction.
  • none of these.
Q.29

Which of the following is not an intensive property ?

  • Chemical potential
  • Surface tension
  • Heat capacity
  • None of these
Q.30

"At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the

  • third law of thermodynamics
  • second law of thermodynamics
  • Nernst heat theorem
  • Maxwell's relations
Q.31

In a working refrigerator, the value of COP is always

  • 0
  • < 0
  • < 1
  • > 1
Q.32

Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?

  • Air cycle
  • Carnot cycle
  • Ordinary vapour compression cycle
  • Vapour compression with a reversible expansion engine
Q.33

During Joule-Thomson expansion of gases

  • enthalpy remains constant.
  • entropy remains constant.
  • temperature remains constant.
  • none of these.
Q.34

The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr-1 = 0.where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always

  • > 2
  • < 1
  • > 1
  • < 3
Q.35

For a cyclic process, a fixed ratio between heat and work

  • always exists
  • may exist
  • never exists
  • is difficult to predict
Q.36

The shape of T-S diagram for Carnot Cycle is a

  • rectangle
  • rhombus
  • trapezoid
  • circle
Q.37

"Dry ice" is

  • moisture free ice
  • solid helium
  • solid carbon dioxide
  • none of these
Q.38

In jet refrigerators, the refrigerating fluid is practically always

  • water
  • ammonia
  • freon
  • brine
Q.39

Water on heating from 1 to 4°C

  • contracts
  • expands
  • has same volume
  • may contract or expand
Q.40

__________ increases with increase in pressure.

  • The melting point of wax
  • The boiling point of a liquid
  • both (a) and (b)
  • neither (a) nor (b)
Q.41

All gases during throttling process at atmospheric temperature and pressure show a cooling effect except

  • CO2
  • H2
  • O2
  • N2
Q.42

Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.

  • 1st
  • zeroth
  • 3rd
  • none of these
Q.43

Degress of freedom at triple point will be

  • 0
  • 1
  • 2
  • 3
Q.44

Which of the following is not a common refrigerant ?

  • Freon-12
  • Ethylene
  • Ammonia
  • Carbon dioxide
Q.45

For an isothermal process, the internal energy of a gas

  • increases
  • decreases
  • remains unchanged
  • data insufficient, can't be predicted
Q.46

Which of the following non-flow reversible compression processes require maximum work ?

  • Adiabatic process
  • Isothermal process
  • Isobaric process
  • All require same work
Q.47

Pick out the correct statement.

  • Compression ratio of an Otto engine is comparatively higher than a diesel engine.
  • Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
  • Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat.
  • Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work.
Q.48

A refrigerator may be termed as a

  • heat pump
  • heat engine
  • Carnot engine
  • none of these
Q.49

Compressibility factor for almost all the gases are approximately same at the same

  • pressure and temperature.
  • reduced pressure and reduced temperature.
  • critical pressure and critical temperature.
  • none of these.
Q.50

The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containingmole % each of n- heptane and n- octane into pure compounds each at 1 atm is

  • -2 RT ln 0.5
  • -RT ln 0.5
  • 0.5 RT
  • 2 RT
0 h : 0 m : 1 s