Engineering Thermodynamics
Which of the following process can be made reversible with the help of a regenerator?

Constant volume process
All of these
Constant pvn process
Constant pressure process

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Engineering Thermodynamics
According to First law of thermodynamics,

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

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Engineering Thermodynamics
Coke is produced

By heating wood with a limited supply of air to a temperature not less than 280°C
When coal is first dried and then crushed to a fine powder by pulverizing machine
When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel
From the finely ground coal by moulding under pressure with or without a binding material

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