Assume a cyclic machine that exchanges 6 kW with a 250°C

Solution 40 HP:

Step 1 of 2:-

If the machine is a heat engine, then what are the things we can say about the two processes, we have to state here.

1. , .

The machine exchanges heat at a rate of 6 kw at with a reservoir.

is exchanged with a ambient.

Here which violates the 2nd law of thermodynamics by providing 100% efficiency.

The Kelvin-Planck statement will be invalid for the case, hence not possible.

b)

2. , .

Here, the engine cannot be an irreversible one as the efficiency will be zero.