Related Questions
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COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
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Entropy is a/an
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The compressibility factor for an ideal gas is 1. Its value for any other real gas is
D. Either (B) or (C), depends on the nature of the gas
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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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In an ideal gas mixture, fugacity of a species is equal to its
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Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system?
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Work done in case of free expansion is
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Activity co-efficient is a measure of the
A. Departure from ideal solution behaviour
B. Departure of gas phase from ideal gas law
C. Vapour pressure of liquid
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Gibbs-Helmholtz equation is
A. ΔF = ΔH + T [∂(ΔF)/∂T]P
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The intensive properties are
A. Molar volume, density, viscosity and boiling point
B. Refractive index and surface tension
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The adiabatic throttling process of a perfect gas is one of constant enthalpy
A. In which there is a temperature drop
B. Which is exemplified by a non-steady flow expansion
C. Which can be performed in a pipe with a constriction
D. In which there is an increase in temperature
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Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
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During Joule-Thomson expansion of gases
A. Enthalpy remains constant
B. Entropy remains constant
C. Temperature remains constant
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Solid and liquid phases of a substance are in equilibrium at the
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In the reaction, H2 +I2 2HI, addition of an inert gas will
A. Increase the partial pressure of H2
B. Increase the partial pressure of I2
C. Increase the total pressure and hence shift the equilibrium towards the right
D. Not affect the equilibrium conditions
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For a reversible process involving only pressure-volume work
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An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to
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4
The third law of thermodynamics states that the
A. Heat capacity of a crystalline solid is zero at absolute zero temperature
B. Heat transfer from low temperature to high temperature source is not possible without external work
C. Gases having same reduced properties behaves similarly
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Pick out the wrong statement
A. Phase rule variables are intensive properties
B. Heat and work are both state function
C. The work done by expansion of a gas in vacuum is zero
D. CP and CV are state function
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Which of the following is a thermodynamic property of a system?
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Trouton's ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K)
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If we increase the pressure on a substance (which is at its triple point), then the triple point
D. May increase or decrease; depends on the substance
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Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is
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A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)
B. Δ S1 is sometimes > Δ SR
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Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.
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1st law of thermodynamics is nothing but the law of conservation of
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As the temperature is lowered towards the absolute zero, the value of the quantity (∂ΔF/∂T) approaches
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The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of
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Linde gas liquefaction process employs cooling
B. By expansion in an engine
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Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the