Answer :
The correct solutions are -
(a) The net energy transferred to the system by heat during one complete cycle is 15 kJ
(b) The net energy input per cycle by heat is -15 kJ
The net energy transferred to the system is equal to work done. The work done will be calculated by the calculating the area enclosed in the figure.
The area = 1/2 × (8 - 2) × 5
Performing multiplication and division on Right Hand Side of the equation
Work done = 1/2 × 6 × 5
Work done = 3 × 5
Work done = 15 kJ
On reversing the cycle, the net energy input per cycle be heat will be -15kJ.
Hence, work done is 15 kj and net energy input is -15kJ.
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