Engineering Thermodynamics
Otto cycle consists of

Two constant volume and two isothermal processes
Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
One constant pressure, one constant volume and two isentropic processes

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
All of these
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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