Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

All of these
Free expansion or friction resisted expansion/compression process should not be encountered
When heat is being absorbed, temperature of hot source and working substance should be same
When beat is being rejected, temperature of cold source and working substance should be same

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Engineering Thermodynamics
Extensive property of a system is one whose value

Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume
Is dependent on the path followed and not on the state
Is not dependent on the path followed but on the state

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Engineering Thermodynamics
According to First law of thermodynamics,

Internal energy, enthalpy and entropy during a process remain constant
Work-done by a system is equal to the heat transferred by the system
Total energy of a system remains constant
Total internal energy of a system during a process remains constant

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