SSC JE Mechanical Engineering 2018 Set 3 Paper

Question : 143 of 200

Marks: +1, -0

If a heat engine produces work without the consumption of energy, then what kind of machine is this?

Perpetual motion machine of first kind (PMM1)
Perpetual motion machine of second kind (PMM2)
Perpetual motion machine of third kind (PMM3)
None of these

Solution:

PMM - 1 : A machine which violets the first law of thermodynamics is called PMM – I . or “ A machine which gives continuous work without receiving energy from other system”.

PMM – 2 : A machine will exchange heat from a single heat reservoir and produce equal amount of work.
Q → [PMM - 2] → w

\;\;\;\;

Q = w

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