SATHEE: Thermodynamics - Result Question 20

Thermodynamics - Result Question 20

21. A thermodynamic system is taken through the cycle $A B C D$ as shown in figure. Heat rejected by the gas during the cyclic process is :[2012]

(a) $2 P V$

(b) $4 P V$

(d) $P V$

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Answer:

Correct Answer: 21. (a)

Solution:

(a) $∵$ Internal energy is the state function. $∴$ In cyclie process; $Δ U = 0$

According to 1st law of thermodynamics

$Δ Q = Δ U + W$

So heat absorbed

$Δ Q = W =$ Area under the curve

$= - (2 V) (P) = - 2 P V$

So heat rejected $= 2 P V$

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Thermodynamics - Result Question 20

21. A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cyclic process is :[2012]

Answer:

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21. A thermodynamic system is taken through the cycle $A B C D$ as shown in figure. Heat rejected by the gas during the cyclic process is :[2012]