Mechanical Engineering :: Thermodynamics
- If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
- The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)
- Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)
- According to First law of thermodynamics,
- According to Kelvin-Planck’s statement of second law of thermodynamics,
- According to Kelvin-Planck's statement of second law of thermodynamics,
- The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
- Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
- Which of the following is the correct statement of the second law of thermodynamics?
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A.
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
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B.
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body |
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C.
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
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D.
None of the above |
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A.
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
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B.
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
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C.
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body |
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D.
None of the above |
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A.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature. |
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B.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source. |
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C.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle. |
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D.
None of the above |
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A.
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy |
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B.
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source |
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C.
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work |
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D.
All of the above |