Thermal Engineering Questions and Answers – Availability and Irreversibility

This set of Thermal Engineering Questions and Answers for Aptitude test focuses on “Availability and Irreversibility”.

1. Availability function (∅) is given by ______
a) U-p₀V-T₀S
b) U+p₀V-T₀S
c) –U+p₀V-T₀S
d) p₀V-T₀S
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2. What is the lowest temperature at which heat rejection can takes place?
a) 100°C
b) 0K
c) 273K
d) Temperature equal to surrounding
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3. Gibbs function is given by _____
a) G = H – TS
b) G = pV – TS
c) G = U – pV
d) G = U + pV
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4. What is the part of heat energy which is converted into mechanical work which reduce system in state of equilibrium?
a) Available energy
b) Electrical energy
c) Unavailable energy
d) Hydraulic energy
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5. The _________ obtainable from a certain heat input in a cyclic heat engine is called _________
a) Maximum work, unavailable energy
b) Maximum work, available energy
c) Minimum work, available energy
d) Minimum work, unavailable energy
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6. What is the part of heat energy which cannot be converted into mechanical work which reduce system in state of equilibrium?
a) Available energy
b) Electrical energy
c) Unavailable energy
d) Hydraulic energy
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7. The _________ has to be rejected by any cyclic heat engine is called _________
a) Maximum energy, unavailable energy
b) Maximum energy, available energy
c) Minimum energy, available energy
d) Minimum energy, unavailable energy
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8. The difference between idealized reversible work and actual work done by the system is called _____
a) Reversibility
b) Irreversibility
c) Gain in available energy
d) Decrease in unavailable energy
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9. Availability is also known as __________
a) Exergy
b) Ronthalpy
c) Enthalpy
d) Entropy
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10. Which of the following statements applicable to a perfect gas will also be true for an irreversible process?
a) dQ = dU + pdV
b) dQ = du – pdV
c) Tds = dU + pdV
d) Tds = du – pdV
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11. Which of the following statement is correct?
a) Available energy is generally conserved
b) Available energy is maximum theoretical work obtainable
c) Available energy can either be negative or positive
d) Available energy is minimum theoretical work obtainable
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12. When system undergoes a process such that ∫dQ/T = 0 and ∆S>0, the process is ______
a) Irreversible adiabatic
b) Reversible adiabatic
c) Isothermal
d) Isobaric
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Sanfoundry Global Education & Learning Series – Thermal Engineering

To practice all areas of Thermal Engineering for Aptitude test, here is complete set of 1000+ Multiple Choice Questions and Answers.