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Efficiency is nothing but calculating how the machine is performing for what it has been made for,

Efficiency is usually calculated in % as (output/input )X100.

for Eg. the Thermal efficiency of an reciprocating gasoline engine can be calculated as follows,

Let,

the input for an reciprocating engine is 12MJ and its out put is 4MJ

then Efficiency is (4/12)X100 = 33%

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