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Thermodynamics
Practice Questions 2

1 .      

In the above figure, QH is 10000 J and QC is 6000 J. What is the efficiency? [Hint]

 
 
 
 


2 .      

If the heat engine above is a Carnot engine, and QH is 10000J, what is W? [Hint]

 
 
 
 


3 .      
What is the heat loss, QC? [Hint]

 
 
 
 


4 .      

What is the coefficient of performance (CP) of the reversible (Carnot) refrigerator shown above? [Hint]

 
 
 
 


5 .      

What is the coefficient of performance (CP) of the reversible (Carnot) heat pump shown above? [Hint]

 
 
 
 


6 .      

The heat engine shown above is [Hint]

 
 
 
 


7 .      

The heat engine shown above is [Hint]

 
 
 
 


8 .      

The heat engine shown above is [Hint]

 
 
 
 


9 .       Use this animation

The gas in the cylinder is undergoing a Carnot cycle. In which step is the gas absorbing heat? [Hint]

 
 
 
 


10 .       Use this animation

In which step is the temperature of the gas animation increasing? [Hint]

 
 
 
 


11 .       Use this animation

In which step is the gas animation losing heat? [Hint]

 
 
 
 


12 .       Use this animation

In which step is the gas doing work but not exchanging heat? [Hint]

 
 
 
 


13 .       A reservoir delivers 1000 J of heat to another reservoir at 133 oC. What is the increase in entropy of the second reservoir? [Hint]

 
 
 
 


14 .       A reservoir delivers 1000 J of heat to another reservoir at 133 oC. What can be said about the change in entropy of the first reservoir during the process? [Hint]

 
 
 
 


15 .       Entropy is related to order. The chances of getting two heads when you throw two coins is 1/4. What is the chance of getting four heads when you throw four coins?

[Hint]

 
 
 
 






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