A heat engine absorbs heat Q_1 at temperature T_1 and heat Q_2 at temperature T_2 . Work done by the engine is J(Q_1+Q_2). This data

  • Option 1)

    violates 1st  law of thermodynamics

  • Option 2)

    violates 1st  law of thermodynamics if Q_1 is -ve

  • Option 3)

    violates 1st  law of thermodynamics if Q_2 is -ve

  • Option 4)

     does not  violates 1st  law of thermodynamics

 

Answers (1)

As we learnt in

First law of Thermodynamics -

Energy of universe is always conserved or total energy of an isolated system is always conserved

\Delta E= q + W


 

- wherein

\Delta E= Internal Energy

q= Heat

W= work

 

 This is in accordance with 1st law of thermodynamics 


Option 1)

violates 1st  law of thermodynamics

This option is incorrect 

Option 2)

violates 1st  law of thermodynamics if Q_1 is -ve

This option is incorrect 

Option 3)

violates 1st  law of thermodynamics if Q_2 is -ve

This option is incorrect 

Option 4)

 does not  violates 1st  law of thermodynamics

This option is correct 

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