Thermodynamics Questions and Answers – Quality of Energy

This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Quality of Energy”.

1. A hot gas flowing through a pipeline can be considered as a
a) reversible process
b) irreversible process
c) both of the mentioned
d) none of the mentioned
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2. For an infinitesimal reversible process at constant pressure,
a) dS=m*dT/T
b) dS=Cp*dT/T
c) dS=m*dT/T
d) dS=m*Cp*dT/T
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3. Adequate insulation must be provided for high temperature fluids.
a) true
b) false
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4. The loss of exergy is more when,
a) the heat loss occurs at a higher temperature
b) the heat loss occurs at a lower temperature
c) depends on the process
d) none of the mentioned
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5. The exergy of a fluid at a higher temperature is ___ than that at a lower temperature and ___ as the temperature decreases.
a) less, increases
b) more, increases
c) more, decreases
d) less, decreases
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6. The second law affixes a quality to energy of a system at any state.
a) true
b) false
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7. The available energy of a system ___ as its temperature or pressure decreases and approaches that of the surroundings.
a) increases
b) decreases
c) remains constant
d) none of the mentioned
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8. At ambient temperature, exergy of the fluid is
a) neagtive
b) positive
c) infinity
d) zero
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9. Which of the following is true?
a) the first law states that the energy is always conserved quantity-wise
b) the second law states that the energy always degrades quality-wise
c) both of the mentioned
d) none of the mentioned
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10. If the first law is the conservation of energy, then the second law is called the law of degradation of energy.
a) true
b) false
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11. When a gas is throttled adiabatically from a high to a low pressure,
a) the enthalpy remains same
b) there is degradation of energy
c) both of the mentioned
d) none of the mentioned
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12. The ___ in entropy in an irreversible change is a measure of the extent to which energy ___ in that change.
a) decrease, degrades
b) increase, degrades
c) increase, increases
d) decrease, increases
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13. If two bodies were allowed to reach thermal equilibrium, one by heat conduction and other by operating a Carnot engine between them and extracting work, the final equilibrium temperatures would be different.
a) this is because of the lower value of the total internal energy
b) this is because of the higher value of the total internal energy
c) both of the mentioned
d) none of the mentioned
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14. Adequate insulation is not that important for low temperature fluids.
a) true
b) false
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Sanfoundry Global Education & Learning Series – Thermodynamics.
To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.