thermodynamics mechanical-engineering question and answers -Page 6

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Thermodynamics problems

1. According to Kelvin-Planck's statement of second law of thermodynamics,
Options
A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B. it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
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
D. none of the above

3. For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)
Options
A. p v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant

6. The general gas energy equation is (where Q_{1 - 2} = Heat supplied, dU = Change in internal energy, and W_{1 - 2} = Work done in heat units)
Options
A. Q_{1 - 2} = dU + W_{1 - 2}
B. Q_{1 - 2} = dU - W_{1 - 2}
C. Q_{1 - 2} = dU/W_{1 - 2}
D. Q_{1 - 2} = dU x W_{1 - 2}

8. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
Options
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kelvin Planck's law

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