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12. Thermodynamics
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Q12 of 27 Page 87

Can a system be heated and its temperature remains constant?

Given temperature remains constant


It states that heat supplied is used for the work in the


surroundings.


∴ it is possible that the heat applied to the system is


used in expansion.


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10

Consider a cycle followed by an engine (Fig. 12.6) 1 to 2 is isothermal 2 to 3 is adiabatic 3 to 1 is adiabatic Such a process does not exist because


11

Consider a heat engine as shown in Fig. 12.7. Q1 and Q2 are heat added to heat bath T1 and heat taken from T2 in one cycle of engine. W is the mechanical work done on the engine. If W > 0, then possibilities are:


13

A system goes from P to Q by two different paths in the P-V diagram as shown in Fig. 12.8. Heat given to the system in path 1 is 1000 J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?

14

If a refrigerator’s door is kept open, will the room become cool or hot? Explain.

Questions · 27
12. Thermodynamics
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