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If a heat engine produce work only by interacting with one source. What kind of machine is this? 

If a heat engine produce work only by interacting with one source. What kind of machine is this?  Correct Answer Perpetual motion machine of second kind (PMM2)

Explanation:

Perpetual motion machine of first kind (PMM1):

A fictitious machine which continuously supply mechanical work without some other form of energy disappearing simultaneously is called the PMM1.

This type of machine violates the first law of thermodynamics.

Additional Information

Perpetual motion machine of second kind (PMM2):

A fictitious machine which produce net work in a complete cycle by exchanging heat with only one reservoir is called the PMM2.

It violates the Kelvin plank statement.

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Perpetual motion machine of the third kind (PMM3):

A movable device which continuously moves in the absence of friction is known as PMM3.

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