Solutions Manual for Statistical Mechanics in Engineering Thermodynamics.
Maximum work that could be secured by expanding the gas over a given pressure
range is the__________work. - Answersisothermal
Internal energy change of a system over one complete cycle in a cyclic process is -
Answerszero
Heating of water under atmospheric pressure is an __________ process. -
Answersisobaric
Van Laar equation deals with the activity co-efficients in - Answersbinary solutions
High __________ is an undesirable property for a good refrigerant. - Answersviscosity
Solubility of a substance which dissolves with an increase in volume and liberation of
heat will be favoured by the - Answerslow pressure and low temperature.
Entropy is a measure of the __________ of a system. - Answersdisorder
A chemical reaction will occur spontaneously at constant pressure and temperature, if
the free energy is - Answersnegative
Fundamental principle of refrigeration is based on the __________ law of
thermodynamics. - Answerssecond
For a spontaneous process, free energy - Answersdecreases 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? -
AnswersCarnot refrigeration cycle.
In a working refrigerator, the value of COP is always - Answers>1
__________ increases with increase in pressure. - AnswersThe melting point of wax;
The boiling point of a liquid
A refrigerator may be termed as a - Answersheat pump
For a stable phase at constant pressure and temperature, the fugacity of each
component in a binary system __________ as its mole fraction increases. -
Answersincreases
Which of the following is not an intensive property? - AnswersHeat capacity
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of
performance)? - AnswersAir cycle
Measurement of thermodynamic property of temperature is facilitated by __________
law of thermodynamics. - Answerszeroth
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... - Answers-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. - Answers327
Entropy of an ideal gas depends upon its - AnswersPressure and Temperature
Isobaric process means a constant process. - Answerspressure
No work is done by the system, when a reaction occurs at constant - Answersvolume
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 -
AnswersClayperon-Claussius equation
,The freezing point of a liquid decreases when the pressure is increased, if the liquid
__________ while freezing. - Answerscontracts
"At the absolute zero temperature, the entropy of every perfectly crystalline substance
becomes zero". This follows from the - Answersthird law of thermodynamics
During Joule-Thomson expansion of gases - Answersenthalpy 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 - Answers< 1
Degrees of freedom at triple point will be - Answers0
"Law of corresponding states" says that - Answerstwo different gases behave similarly,
if their reduced properties (i.e. P, V and T) are same.
Linde gas liquefaction process employs cooling - Answersby throttling
Pick out the wrong statement pertaining to the decomposition of PCl5 represented by,
PCl5 PCl3 + Cl2.Degree of dissociation of PCl5 will - AnswersNone 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 - Answersadiabatic and isenthalpic
Boyle's law for gases states that - AnswersP∞1/V,when temperature & mass of the gas
remain constant.
1st law of thermodynamics is nothing but the law of conservation of - Answersenergy
In a reversible chemical reaction (where, Δx = number of moles of products-number of
moles of reactants) - Answersaddition 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? -
AnswersCarnot cycle
Pick out the correct statement: - AnswersUnder reversible conditions, the adiabatic work
is less than isothermal work.
In any spontaneous process, - Answersboth F and A decreases
Which of the following is a thermodynamic property of a system? - AnswersEntropy
Equilibrium constant decreases as the temperature - Answersincreases, for an
exothermic reaction.
The expression G=nRT . ln P2/P1,gives the free energy change - Answerswith pressure
changes at constant temperature.
All gases during throttling process at atmospheric temperature and pressure show a
cooling effect except - AnswersH2
Compressibility factor for almost all the gases are approximately same at the same -
Answersreduced pressure and reduced temperature.
Pick out the wrong statement. - AnswersThe 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. - AnswersNone 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 - AnswersAll of these (refer to the image)
In jet refrigerators, the refrigerating fluid is practically always - Answerswater
Water on heating from 1 to 4°C - Answerscontracts
Pick out the correct statement. - AnswersEfficiency 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 - Answersmore water will be
formed.
Partial molar free energy of an element A in solution is same as its - Answerschemical
potential
Free energy change at equilibrium is - Answerszero
Heat pump - Answersaccomplishes 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. - Answerscritical
What is the value of ln y (where y = activity co-efficient) for ideal gases? - Answerszero
A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the
system - AnswersU and S both decreases
Which is not a refrigerant? - AnswersC2H4Cl2
The partial pressure of each constituent present in an alloy is __________ the total
vapor pressure exerted by the alloy. - Answersless than
Heat is added at constant pressure in an ideal __________ cycle. - AnswersBrayton;
Rankine
Heat is added at constant pressure in an ideal __________ cycle. - Answersmolar
concentration; quantity
The four properties of a system viz. P, V, T, S are related by __________ equation. -
AnswersMaxwell's
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature)
would be __________ c.c. - Answers200
Pick out the wrong statement. - AnswersThe heat capacity of solid inorganic substance
is exactly equal to the heat capacity of the substance in the molten state.
The principle applied in liquefaction of gases is - Answersadiabatic expansion; Joule-
Thomson effect
Co-efficient of performance for a reversed Carnot cycle working between temperatures
T1 and T2 (T1 > T2) is - AnswersT2/T1-T2
The number of degrees of freedom for an azeotropic mixture in a two component
vapour-liquid equilibria is/are - Answersone
Any substance above its critical temperature exists as - Answersgas
Which of the following decreases with increase in pressure? - AnswersMelting point of
ice
Isentropic process means a constant __________ process. - Answersentropy
1/V(aV/aT) is the mathematical expression - Answersco-efficient of thermal expansion.
In case of steady flow compression polytropic process (PVn = constant), the work done
on air is the lowest, when - Answersn=1
