Q.1
In the reaction; N₂ + O₂ ⇋ 2NO, increasing the pressure will result in
Q.2
Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is
Q.3
In a reversible chemical reaction (where, Δx = number of moles of products-number of moles of reactants )
Q.4
Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.
Q.5
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.6
What is the ratio of adiabatic compressibility to isothermal compressibility?
Q.7
Which of the following non-flow reversible compression processes require maximum work?
Q.8
What is the value of Joule-Thomson co-efficient for an ideal gas?
Q.9
Which of the following equations is used for the prediction of activity co-efficient from experiments?
Q.10

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.11

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.12

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.13

Which of the following is not an intensive property ?

  • Chemical potential
  • Surface tension
  • Heat capacity
  • None of these
Q.14

"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.15

In a working refrigerator, the value of COP is always

  • 0
  • < 0
  • < 1
  • > 1
Q.16

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.17

During Joule-Thomson expansion of gases

  • enthalpy remains constant.
  • entropy remains constant.
  • temperature remains constant.
  • none of these.
Q.18

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.19

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

  • always exists
  • may exist
  • never exists
  • is difficult to predict
Q.20

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

  • rectangle
  • rhombus
  • trapezoid
  • circle
Q.21

"Dry ice" is

  • moisture free ice
  • solid helium
  • solid carbon dioxide
  • none of these
Q.22

In jet refrigerators, the refrigerating fluid is practically always

  • water
  • ammonia
  • freon
  • brine
Q.23

Water on heating from 1 to 4°C

  • contracts
  • expands
  • has same volume
  • may contract or expand
Q.24

__________ 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.25

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

  • CO2
  • H2
  • O2
  • N2
Q.26

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

  • 1st
  • zeroth
  • 3rd
  • none of these
Q.27

Degress of freedom at triple point will be

  • 0
  • 1
  • 2
  • 3
Q.28

Which of the following is not a common refrigerant ?

  • Freon-12
  • Ethylene
  • Ammonia
  • Carbon dioxide
Q.29

For an isothermal process, the internal energy of a gas

  • increases
  • decreases
  • remains unchanged
  • data insufficient, can't be predicted
Q.30

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

  • Adiabatic process
  • Isothermal process
  • Isobaric process
  • All require same work
Q.31

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.32

A refrigerator may be termed as a

  • heat pump
  • heat engine
  • Carnot engine
  • none of these
Q.33

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.34

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
Q.35

"Law of corresponding states" says that

  • , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
  • the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature.
  • no gas can be liquified above the critical temperature, howsoever high the pressure may be.
  • the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories).
Q.36

The most important application of distribution law is in

  • evaporation
  • liquid extraction
  • drying
  • distillation
Q.37

Pick out the correct statement.

  • Entropy and enthalpy are path functions.
  • In a closed system, the energy can be exchanged with the surrounding, while. matter can not be exchanged.
  • All the natural processes are reversible in nature.
  • Work is a state function.
Q.38

Pick out the correct statement.

  • A real gas on expansion in vacuum gets heated up.
  • An ideal gas on expansion in vacuum gets cooled.
  • An ideal gas on expansion in vacuum gets heated up.
  • A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected.
Q.39

For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.

  • decreases
  • increases
  • remains same
  • decreases linearly
Q.40

Pick out the wrong statement.

  • Activity co-efficient is dimensionless.
  • In case of an ideal gas, the fagacity is equal to its pressure.
  • In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.
  • The fugacity co-efficient is zero for an ideal gas.
Q.41

Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.

  • 270
  • 327
  • 300
  • 540
Q.42

Air-refrigeration cycle

  • is the most efficient of all refrigeration cycles.
  • has very low efficiency.
  • requires relatively large quantities of air to achieve a significant amount of refrigeration.
  • both (b) and (c).
Q.43

The first law of thermodynamics is a statement of conservation of

  • heat
  • momentum
  • energy
  • work
Q.44

"When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change." This is called the

  • Le-Chatelier principle.
  • Kopp's rule.
  • law of corresponding state.
  • Arrehenius hypothesis.
Q.45

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.46

Pick out the wrong statement.

  • Activity co-efficient is dimensionless.
  • In case of an ideal gas, the fagacity is equal to its pressure.
  • In a mixture of ideal gases, the fugacity of a component is equal to the partial pressure of the component.
  • The fugacity co-efficient is zero for an ideal gas.
Q.47

"When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change." This is called the

  • Le-Chatelier principle.
  • Kopp's rule.
  • law of corresponding state.
  • Arrehenius hypothesis.
Q.48

The first law of thermodynamics is a statement of conservation of

  • heat
  • momentum
  • energy
  • work
Q.49

Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the

  • two temperatures only.
  • pressure of working fluid.
  • mass of the working fluid.
  • mass and pressure both of the working fluid.
Q.50

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

  • 5.2
  • 6.2
  • 0.168
  • data insufficient, can't be found out
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