पानी 10000 cm के दबाव शीर्ष के तहत 200 cm व्यास वाले एक पाइप में प्रवाहित होती है। पाइप के दिवार की मोटाई 0.75 cm है। तो पाइप के दिवार में तन्य प्रतिबल MPa में क्या है?

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SSC JE ME Previous Paper 10 (Held on: 11 December 2020 Morning)
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  1. 13.0
  2. 100
  3. 130.5
  4. 1305

Answer (Detailed Solution Below)

Option 3 : 130.5
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संकल्पना:

एक पतले सिलेंडर के लिए:

अनुदैर्ध्य प्रतिबल: \({\sigma _L} = \frac{{pd}}{{4t}}\)

हूप प्रतिबल: \({\sigma _h} = \frac{{pd}}{{2t}}\)

गणना:

दिया गया है:

व्यास, d = 200 cm = 2 m, दबाव शीर्ष, h = 10,000 cm = 100 m, मोटाई t = 0.75 cm = 0.0075 m 

अनुदैर्ध्य और हूप प्रतिबल दोनों प्रकृति में तन्य होते हैं, लेकिन मोटाई के डिज़ाइन महत्व के अनुसार हम गणना के लिए हूप प्रतिबल का प्रयोग करते हैं। 

सिलेंडर के अंदर दबाव, P = ρgh = 1000 × 10 × 100 = 106 Pa

\({\sigma _h} = \frac{{pd}}{{2t}} \)

\({\sigma _h} = \frac{{10^6~\times~2}}{{2~\times~0.0075}} = 133.3~\times10^6\) = 133.3 MPa ∼ 130.5 MPa

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