Related Questions
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4
The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
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4
Requisites of a reversible process is that the
A. System and surroundings pressure be equal
B. Friction in the system should be absent
C. System and surroundings temperature be equal
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4
Which of the following is an extensive property of a system?
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Throttling (Joule-Thomson effect) process is a constant __________ process.
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4
Pick out the wrong statement.
A. Minimum number of degree of freedom of a system is zero
B. Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4
C. For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4
D. Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation
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All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
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For an ideal gas, the enthalpy
A. Increases with rise in pressure
B. Decreases with rise in pressure
C. Is independent of pressure
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At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)
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Which of the following is not correct for a reversible adiabatic process?
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A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.
D. Data insufficient; can't be computed
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In an ideal gas mixture, fugacity of a species is equal to its
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A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.
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A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P1 and P2. (where, P1 and P2 are initial and final pressures respectively)
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Gibbs free energy per mole for a pure substance is equal to the
A. Latent heat of vaporisation
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A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by
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The work done in isothermal compression compared to that in adiabatic compression will be
D. More or less depending upon the extent of work done
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When a gas is subjected to adiabatic expansion, it gets cooled due to
B. Decrease in temperature
C. Decrease in kinetic energy
D. Energy spent in doing work
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The acentric 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 acentric factor is always
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As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
D. An indeterminate value
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Entropy change in case of reversible adiabatic process is
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Which of the following is not a unit of the equilibrium constant Kp? (where, Δx = number of moles of products number of moles of reactants)
A. (atm)Δx, when Δx is negative
B. (atm)Δx, when Δx is positive
C. Dimensionless, when Δx = 0
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What is the ratio of adiabatic compressibility to isothermal compressibility?
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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?
A. Vapor compression cycle using expansion valve
B. Air refrigeration cycle
C. Vapor compression cycle using expansion engine
D. Carnot refrigeration cycle
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Chemical engineering thermodynamics is concerned with the __________ in/of chemical processes.
C. Energy transformation from one form to another
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The value of Cp & Cv respectively for monatomic gases in Kcal/kg Mole.°K are
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A solid is transformed into vapour without going to the liquid phase at
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To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (ΔHV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the
A. Volume of the liquid phase is negligible compared to that of vapour phase
B. Vapour phase behaves as an ideal gas
C. Heat of vaporisation is independent of temperature
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At a given temperature, the volume of a gas dissolved in a solvent __________ with increase in pressure.
D. May increase or decrease; depends on the gas
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Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the
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Ideal gas law is applicable at