How is the efficiency of a thermodynamic engine defined? (select all correct answers.) view available hint(s) how is the efficiency of a thermodynamic engine defined? (select all correct answers.) it is the ratio of how much thermal energy the engine is able to utilize to how much it actually used. it is the ratio of the energy supplied to the engine to the unit work performed by it. it is the ratio of the work done by the working substance on the environment to the energy transferred from the hot reservoir to the working substance. it is the ratio of how much work the thermodynamic engine is capable of performing to how much work it actually performed. it is the ratio of the useful work done by the engine to the energy supplied to it.