$A$ heat engine absorbs heat $Q_1$ at temperature $T_1$ and heat $Q_2$ at temperature $T_2$. Work done by the engine is $(Q_1 + Q_2)$. This data
- AViolates $1^{st}$ law of thermodynamics
- BViolates $1^{st}$ law of thermodynamics if $Q_1$ is $-ve$
- CViolates $1^{st}$ law of thermodynamics if $Q_2$ is $-ve$
- DDoes not violate $1^{st}$ law of thermodynamics
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