### Related Questions

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# Melting of wax is accompanied with __________ in entropy.

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# In a homogeneous solution, the fugacity of a component depends upon the

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# When a system is in equilibrium for all possible processes, the differential or finite change of entropy is

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# Pick out the correct statement.

A. Compression ratio of an Otto engine is comparatively higher than a diesel engine

B. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio

C. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat

D. Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work

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# The equation, C_{p} - C_{v} = R, is true for __________ gas.

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# The enthalpy change when ammonia gas is dissolved in water is called the heat of

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# On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)_{s} and the slope of the reversible isothermal line (∂P/ ∂V)_{T} are related as (where, y = C_{p}/C_{v})

A. (∂P/∂V)_{S} = (∂P/∂V)_{T}

B. (∂P/∂V)_{S} = [(∂P/∂V)_{T}]^{Y}

C. (∂P/∂V)_{S} = y(∂P/∂V)_{T}

D. (∂P/∂V)_{S} = 1/y(∂P/∂V)_{T}

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# In the equation PV^{n} = constant, if the value of n = y = C_{p}/C_{v}, then it represents a reversible __________ process.

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# C_{v} for an ideal gas

A. Does not depend upon temperature

B. Is independent of pressure only

C. Is independent of volume only

D. Is independent of both pressure and volume

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# The free energy change for a chemical reaction is given by (where, K = equilibrium constant)

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# At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.

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

D. Is difficult to predict

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# The equation relating E, P, V and T which is true for all substances under all conditions is given by (∂E/∂V)_{T} = T(∂P/∂T)_{H} - P. This equation is called the

B. Thermodynamic equation of state

D. Redlich-Kwong equation of state

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# In a reversible process

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# In jet refrigerators, the refrigerating fluid is practically always

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# Which of the following identities can be most easily used to verify steam table data for superheated steam?

A. (∂T/∂V)_{S} = (∂p/∂S)_{V}

B. (∂T/∂P)_{S} = (∂V/∂S)_{P}

C. (∂P/∂T)_{V} = (∂S/∂V)_{T}

D. (∂V/∂T)_{P} = -(∂S/∂P)_{T}

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# When dilute aqueous solutions of two salts are mixed, the process is associated with

A. Decrease in temperature

B. Increase in temperature

C. No change in temperature

D. Change in temperature which is a function of composition

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# If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero

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# In an ideal gas mixture, fugacity of a species is equal to its

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# Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?

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# At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be

D. More or less; depending on the system

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# Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K

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# A refrigeration cycle is the same as a __________ cycle,

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# Which of the following is not an intensive property?

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# In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about __________ percent.

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# Which of the following is not an intensive property?

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# The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

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# Which of the following is an undesirable characteristic of a refrigerant?

A. It should be non-explosive

B. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

C. Its vapor pressure at the condenser temperature should be very high

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# Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

B. Liquid sulphur dioxide

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# The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by

A. (R/ΔH) (1/T_{1} - 1/T_{2})

B. (ΔH/R) (1/T_{1} - 1/T_{2})

C. (ΔH/R) (1/T_{2} - 1/T_{1})

D. (1/R) (1/T_{1} - 1/T_{2})