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A cyclic device operates between three thermal reservoirs, as shown in the figure. Heat is transferred to/from the cycle device. It is assumed that heat transfer between each thermal reservoir and the cyclic device takes place across negligible temperature difference. Interactions between the cyclic device and the respective thermal reservoirs that are shown in the figure are all in the form of heat transfer.
The cyclic device can be
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- a reversible heat engine
- a reversible heat pump or a reversible refrigerator
- an irreversible heat engine
- an irreversible heat pump or an irreversible refrigerator.
Correct Option: A
Since heat is taken from the high temperature sources and rejected to low temperature sink, hence the device is a heat engine not heat pump. Since, the temperature differences are negligible, the engine is reversible.
