एक बंद गैसीय प्रणाली 2 बार में एक प्रतिवर्ती स्थिर दबाव प्रक्रिया से गुजरती है जिसमें 100 kJ ऊष्मा को खारिज कर दिया जाता है और आयतन 0.2 m3 से 0.1 m3 तक बदल जाता है। प्रणाली की आंतरिक ऊर्जा में परिवर्तन कितना होगा?

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  1. -100 kJ
  2. -80 kJ
  3. -60 kJ
  4. -40 kJ

Answer (Detailed Solution Below)

Option 2 : -80 kJ
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Detailed Solution

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अवधारणा:

ऊष्मप्रवैगिकी के पहले नियम का उपयोग करके

∆Q = ∆U + किया गया कार्य      ----(1)

जहां, ∆Q = ताप में परिवर्तन, ∆U = प्रणाली की आंतरिक ऊर्जा में परिवर्तन

गणना:

दिया हुआ है कि:

P = 2 bar = 200 kPa, ∆Q = -100 kJ

स्थिर दबाव के लिए प्रतिवर्ती प्रक्रिया कार्य निम्न द्वारा दिया जाता है

W.D. = P (V2 – V1 )

W.D. = 200 (0.1 - 0.2)

W.D. = -20 kJ

समीकरण (1) का उपयोग करने पर,

-100 = ∆U + (-20)

 ∆U = -80 kJ

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