Engineering Thermodynamics
The term N.T.P. stands for

Nominal temperature and pressure
Normal temperature and pressure
Normal thermodynamic practice
Natural temperature and pressure

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Engineering Thermodynamics
According to First law of thermodynamics,

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

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