Question: A heat engine operates quasi - statically between two reservoirs and has a maximum ( Carnot ) efficiency of 2 5 % . The actual

A heat engine operates quasi-statically between two reservoirs and has a maximum (Carnot) efficiency of 25%. The actual efficiency of this engine is 20%.
Which statement is definitely true?
This heat engine uses only adiabatic and isothermal processes.
This heat engine uses neither adiabatic nor isothermal processes.
This heat engine uses at least one process that is neither adiabatic nor isothermal.
There is no work done by the engine during one cycle.
A heat engine operates quasi - statically between

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