The efficiency of an irreversible heat engine is always less than the efficiency of a reversible engine operating between the same two reservoirs(The source and the sink).
The efficiencies of all the reversible heat engines operating between the two reservoirs are the same.
The efficiency of an irreversible heat engine is always less than the efficiency of a reversible engine operating between the same two reservoirs(The source and the sink).
The efficiencies of all the reversible heat engines operating between the two reservoirs are the same.