Question

A mechanic wants to prepare an engine with efficiency 1 . Is it possible ? justify ur answer

Answer 1

100% impossible. Efficiency 1 means 100% efficiency. This means that the
machine uses every bit of energy supplied to it and converts every bit of it to do work. This means no energy is list as heat energy, sound energy, light energy, chemical energy, etc. But this is only theoretical and is not possible in real life.

Answer 2

No
according to kelvin plank statement of secong law of thermodynamics

efficiency of engine is not possible to be 1

1 unit generally equal to = 100%

we know that

n= energy out /energy in

n= W/Q

if n=1

that means that w=Q

heat rejected by system = heat supplied to system

which is impossible

because there is some sink in energy by system