Placement Mock Test - 1

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A power plant operates with a heat- source reservoir at 37 degree centigrade and a heat-sink temperature at 2 degree centigrade. It has a thermal efficiency equal to 50% of the Carnot engine thermal efficiency for the same temperatures. The thermal efficiency of the power plant is

• 0.269
• 0.50
• 0.464
• 0.231

Which of the following conditions is not satisfied by an ideal solution ?

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The Maxwell relation derived from the differential expression for Gibbs free energy (dG) is

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Which of the following conditions are satisfied at the critical point by a gas obeying van der Waals equation of state ?

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Match the items mentioned in the left column with appropriate item in the right column 1 . dH a . TdS - PdV 2 . dG b. TdS + VdP C . -PdV - SdT d . VdP - SdT

• 1-b,2-d
• 1-c,2-d
• 1-c,2-b
• 1-a,2-c

Match the items mentioned in the left column with appropriate item in the right column 1 . Enthalpy(H) a. H-TS 2 . Helmholtz free energy(A) b. U+PV 3 .Gibbs free energy(G) c. U-TS

• 1-b,2-c,3-a
• 1-a,2-b,3-c
• 1-b,2-a,3-c
• 1-c,2-a,3-b

1. Match the processes in the left-hand column with their characteristics in the right-hand column. 1 . isothermal process a. no heat transfer 2 . isobaric process b. constant volume 3 . isochoric process c. constant pressure 4. Adiabatic process d. constant temperature

• 1-d,2-b,3-a,4-c
• 1-d,2-c,3-b,4-a
• 1-d,2-a,3-c,4-b
• 1-b,2-c,3-d,4-a