The value of Cp & Cv respectively for monoatomic gases in Kcal/kg Mole . °K are
A. 5 & 3
B. 3.987 & 1.987
C. 1.987 & 0.66
D. 0.66 & 1.987
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Gibbs-Duhem equation
A. States that n1 dμ1 + n2 dμ2 + .... nj dμj = 0, for a system of definite composition at constant temperature and pressure
B. Applies only to binary systems
C. Finds no application in gas-liquid equilibria involved in distillation
D. None of these
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Pick out the correct statement.
A. The available energy in an isolated system for all irreversible (real) processes decreases
B. The efficiency of a Carnot engine increases, if the sink temperature is decreased
C. The reversible work for compression in non-flow process under isothermal condition is the change in Helmholtz free energy
D. All of the above
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The unity of Planck's constant 'h' in the equation, E = hv is
A. J/s
B. J.S
C. J/kmol
D. Kmol/J
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For the reversible exothermic reaction, N2 + 3H2 ⇋ 2NH3 , increase of pressure would
A. Shift the equilibrium towards right
B. Give higher yield of NH3
C. Both A and B
D. Neither A nor B
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If heat contents of CH4 , C2 H4 and C3 H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4 (g) + C2 H4 (g) ⇋ C3 H8 (g) will be __________ Kcal.
A. -19.4
B. -30.2
C. 55.2
D. -55.2
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Pick out the wrong statement.
A. A refriferation cycle violates the second law of thermadynamics
B. Refrigeration cycle is normally represented by a temperature vs. entropy plot
C. In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases
D. One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW
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The work done in an adiabatic change in a particular gas depends upon changes in the __________ only.
A. Temperature
B. Specific heat
C. Volume
D. Pressure
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The expression, nCv (T2 - T1 ), is for the __________ of an ideal gas.
A. Work done under adiabatic condition
B. Co-efficient of thermal expansion
C. Compressibility
D. None of these
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The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.
A. Temperature
B. Pressure
C. Composition
D. All of the above
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( ∂ T ∂ E ) V is the mathematical expression for
A. CV
B. Enthalpy change
C. Free energy change
D. None of these
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( ∂ T ∂ H ) P is the mathematical expression for
A. CV
B. Entropy change
C. Gibbs free energy
D. None of these
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( ∂ P ∂ T ) H is the mathematical expression for
A. Specific heat at constant pressure (Cp )
B. Specific heat at constant volume (Cv )
C. Joule-Thompson co-efficient
D. None of these
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A refrigeration cycle is the same as a __________ cycle,
A. Turbine
B. Heat engine
C. Reversed heat engine
D. None of these
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Heat of reaction is
A. Dependent on pressure only
B. Dependent on temperature only
C. Dependent on both pressure and temperature
D. Independent of temperature changes
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Pick out the correct statement.
A. Entropy and enthalpy are path functions
B. In a closed system, the energy can be exchanged with the surrounding, while. matter can not be exchanged
C. All the natural processes are reversible in nature
D. Work is a state function
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Pick out the wrong statement.
A. The values of ( ∂ V ∂ P ) T and ( ∂ V 2 ∂ 2 P ) T are zero for a real gas at its critical point
B. Heat transferred is equal to the change in the enthalpy of the system, for a constant pressure, non-flow, mechanically reversible process
C. Thermal efficiency of a Carnot engine depends upon the properties of the working fluid besides the source & sink temperatures
D. During a reversible adiabatic process, the entropy of a substance remains constant
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Heat pump
A. Accomplishes only space heating in winter
B. Accomplishes only space cooling in summer
C. Accomplishes both A and B
D. Works on Carnot cycle
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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.
A. 448
B. 224
C. 22.4
D. Data insufficient; can't be computed
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Which of the following liquid metals has the highest thermal conductivity?
A. Molten sodium
B. Molten lead
C. Mercury
D. Molten potassium
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