The figure above shows the path in the P-V plane that is followed by a reversibl

Question

The figure above shows the path in the P-V plane that is followed by a reversible Carnot engine that uses monatomic Argon gas as its working substance. The system expands isothermally from A to B, expands adiabatically from B to C, contracts isothermally from C to D and contracts adiabatically from D to A.

(1)Going along the path from A to B, the volume of the gas _______.

a)increases

b)decreases

c)stays the same

d) can not be determine

(2)Going along the path from B to C, the pressure of the gas _______.

a)increases

b)decreases

c)stays the same

d) can not be determine

(3)Going along the path from B to C, the internal energy of the gas _______.

a)increases

b)decreases

c)stays the same

d) can not be determine

(4)Going along the path from B to C, heat flow ___________.

a) goes in to the gas

b) goes out of the gas

c) doesnt occour

d) can not be determine

(5)Going along the path from C to D, the internal energy of the gas _______.

a)increases

b)decreases

c)stays the same

d) can not be determine

(6) Going along the cycle from D to A, The internal energy ____________.

a)increases

b)decreases

c)stays the same

d) can not be determine

(7)Going along the cycle from D to A, The gas ____________.  

a) does positive work

b)does negative work

c)does no work

d) leaks out

Explanation / Answer

1) increases ( system expands)

2) decreases ( system contracts)

3) decreases

4) can not be determine

5) stays the same

6) increases

7) negative work

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