Engineering Thermodynamics
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

+60 kJ
-40 kJ
-80 kJ
-140 kJ

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Engineering Thermodynamics
According to Avogadro’s law

The product of the gas constant and the molecular mass of an ideal gas is constant
The sum of partial pressure of the mixture of two gases is sum of the two
All of these
Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

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

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
All of these
Free expansion or friction resisted expansion/compression process should not be encountered

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