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

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

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Engineering Thermodynamics
Select the wrong statement

An Ericsson cycle consists of two constant pressure and two isothermal processes.
A Joule cycle consists of two constant volume and two isentropic processes.
All of these
An Otto cycle consists of two constant volume and two isentropic processes.

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Engineering Thermodynamics
An isolated system is one in which

Both energy and mass cross the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Neither mass nor energy crosses the boundaries of the system
Mass crosses the boundary but not the energy

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