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Chemical Engineering Thermodynamics Questions and Answers
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Chemical Engineering Thermodynamics
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Chemical Engineering ThermodynamicsMaximum work that could be secured by expanding the gas over a given pressure
range is the __________ work. - answer isothermal
Internal energy change of a system over one complete cycle in a cyclic process is -
answer zero
Heating of water under atmospheric pressure is an __________ process. - answer
isobaric
Van Laar equation deals with the activity co-efficient in - answer binary solutions
High __________ is an undesirable property for a good refrigerant. - answer viscosity
Solubility of a substance which dissolves with an increase in volume and liberation of
heat will be favored by the - answer low pressure and low temperature.
Entropy is a measure of the __________ of a system. - answer disorder
A chemical reaction will occur spontaneously at constant pressure and temperature, if
the free energy is - answer negative
Fundamental principle of refrigeration is based on the __________ law of
thermodynamics. - answer second
For a spontaneous process, free energy - answerdecreases whereas the entropy
increases
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? -
answerCarnot refrigeration cycle.
In a working refrigerator, the value of COP is always - answer>1
__________ increases with increase in pressure. - answerThe melting point of wax; The
boiling point of a liquid
A refrigerator may be termed as a - answerheat pump
,For a stable phase at constant pressure and temperature, the fugacity of each
component in a binary system __________ as its mole fraction increases. -
answerincreases
Which of the following is not an intensive property? - answerHeat capacity
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of
performance)? - answerAir cycle
Measurement of thermodynamic property of temperature is facilitated by __________
law of thermodynamics. - answerzeroth
The theoretical minimum work required to separate one mole of a liquid mixture at 1
atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each
at 1 atm is... - answer-RT ln 0.5
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. - answer327
Entropy of an ideal gas depends upon its - answerPressure and Temperature
Isobaric process means a constant process. - answerpressure
No work is done by the system, when a reaction occurs at constant - answervolume
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 -
answerClayperon-Claussius equation
The freezing point of a liquid decreases when the pressure is increased, if the liquid
__________ while freezing. - answercontracts
"At the absolute zero temperature, the entropy of every perfectly crystalline substance
becomes zero". This follows from the - answerthird law of thermodynamics
During Joule-Thomson expansion of gases - answerenthalpy remains constant.
The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr-1 = 0.7, where,
Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric
factor is always - answer< 1
Degrees of freedom at triple point will be - answer0
"Law of corresponding states" says that - answertwo different gases behave similarly, if
their reduced properties (i.e. P, V and T) are same.
,Linde gas liquefaction process employs cooling - answerby throttling
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by,
PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will - answerNone of these - decrease
on addition of Cl2.; increase on addition of an inert gas at constant pressure; decrease
on increasing the pressure of the system.
Joule-Thomson experiment is - answeradiabatic and isenthalpic
Boyle's law for gases states that - answerP∞1/V,when temperature & mass of the gas
remain constant.
1st law of thermodynamics is nothing but the law of conservation of - answerenergy
In a reversible chemical reaction (where, Δx = number of moles of products-number of
moles of reactants) - answeraddition of inert gas favours the forward reaction, when Δx
is positive; pressure has no effect on equilibrium, when Δn = 0; addition of inert gas has
no effect on the equilibrium constant at constant volume for any value of Δx (+ ve, - ve)
or zero).
Out of the following refrigeration cycles, which one has maximum COP? - answerCarnot
cycle
Pick out the correct statement: - answerUnder reversible conditions, the adiabatic work
is less than isothermal work.
In any spontaneous process, - answerboth F and A decreases
Which of the following is a thermodynamic property of a system? - answerEntropy
Equilibrium constant decreases as the temperature - answerincreases, for an
exothermic reaction.
The expression G=nRT . ln P2/P1,gives the free energy change - answerwith pressure
changes at constant temperature.
All gases during throttling process at atmospheric temperature and pressure show a
cooling effect except - answerH2
Compressibility factor for almost all the gases are approximately same at the same -
answerreduced pressure and reduced temperature.
Pick out the wrong statement. - answerThe fugacity co-efficient is zero for an ideal gas.
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. - answerNone of these - kinematic viscosity; work;
temperature
The chemical potential of a component (μi) of a phase is the amount by which its
capacity for doing all work, barring work of expansion is increased per unit amount of
sustance added for an infinitesimal addition at constant temperature and pressure. It is
given by - answerAll of these (refer to the image)
In jet refrigerators, the refrigerating fluid is practically always - answerwater
Water on heating from 1 to 4°C - answercontracts
Pick out the correct statement. - answerEfficiency of an Otto engine is higher than that
of a diesel engine for the same compression ratio.
When pressure is applied on the system, icewater, then - answermore water will be
formed.
Partial molar free energy of an element A in solution is same as its - answerchemical
potential
Free energy change at equilibrium is - answerzero
Heat pump - answeraccomplishes both a and b - space heating in winter; space cooling
in summer
The temperature at which both liquid and gas phases are identical, is called the
__________ point. - answercritical
What is the value of ln y (where y = activity co-efficient) for ideal gases? - answerzero
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the
system - answerU and S both decreases
Which is not a refrigerant? - answerC2H4Cl2
The partial pressure of each constituent present in an alloy is __________ the total
vapor pressure exerted by the alloy. - answerless than
Heat is added at constant pressure in an ideal __________ cycle. - answerBrayton;
Rankine
Heat is added at constant pressure in an ideal __________ cycle. - answermolar
concentration; quantity
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