Chemical Engineering Thermodynamics

471. Which of the following behaves most closely like an ideal gas?

1. He
2. N₂
3. O₂
4. H₂

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472. Which of the following decreases with increase in pressure?

1. Melting point of ice
2. Melting point of wax
3. Boiling point of liquids
4. None of these

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

1. dE = Tds - PdV
2. dQ = CvdT + PdV
3. dQ = CpdT + Vdp
4. Tds = dE - PdV

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474. Which of the following equations is used for the prediction of activity co-efficient from experiments?

1. Van Laar equation
2. Margules equation
3. Wilson's equation
4. All (A), (B) and (C)

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475. Which of the following exemplifies an adiabatic process?

1. Melting of ice
2. Condensation of alcohol vapor
3. Sudden bursting of a cycle tube
4. Evaporation of water

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476. Which of the following has the least thermal efficiency?

1. Steam engine
2. Carnot engine
3. Diesel engine
4. Otto engine

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477. Which of the following has the minimum value of COP for a given refrigeration effect?

1. Reverse Carnot cycle
2. Ordinary vapour-compression cycle
3. Vapour-compression process with a reversible expansion engine
4. Air refrigeration cycle

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

1. (∂T/∂V)S = (∂p/∂S)V
2. (∂T/∂P)S = (∂V/∂S)P
3. (∂P/∂T)V = (∂S/∂V)T
4. (∂V/∂T)P = -(∂S/∂P)T

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479. Which of the following is a thermodynamic property of a system?

1. Concentration
2. Mass
3. Temperature
4. Entropy

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

1. Freon
2. Liquid sulphur dioxide
3. Methyl chloride
4. Ammonia

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