Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Its entropy will change due to irreversibility
Sum of heat and work transfer will be zero
Process is thermodynamically in equilibrium
Process is executed in closed system cycle

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Engineering Thermodynamics
Gases have

Two values of specific heat
Only one value of specific heat
No value of specific heat
Under some conditions one value and sometimes two values of specific heat

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