एक पंप (400 W रेटेड) की दक्षता ज्ञात कीजिए जो 10 मिनट में 500 kg पानी को 30 तक उठा सकता है।(g  = 10m/sका उपयोग करने पर)

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RRB ALP Fitter 23 Jan 2019 Official Paper (Shift 2).
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  1. 92.00%
  2. 77.50%
  3. 84.00%
  4. 62.50%

Answer (Detailed Solution Below)

Option 4 : 62.50%
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अवधारणा:

पंप:

  • एक पंप एक यांत्रिक उपकरण है जिसका उपयोग किसी तरल पदार्थ (तरल या गैस) को पाइपलाइन या नली के अंदर आगे बढ़ने के लिए प्रणोदित करने में किया जाता है।
  • उनका उपयोग सक्शन (आंशिक निर्वात) के निर्माण द्वारा दबाव उत्पन्न करने के लिए भी किया जाता है, जिससे द्रव अधिक ऊंचाई तक बढ़ जाता है।

पंप की दक्षता, 

गणना:

दिया गया:

पावर रेटिंग = 400 W, उठाए गए पानी का द्रव्यमान = 500 kg, H = 30 m, समय = 10 मिनट = 60 × 10 = 600 सेकंड, g = 10 m/s2

बल, F= m × g = 500 × 10 = 5000 N

कार्य = बल × विस्थापन (H) = 5000 × 30 = 150 KJ

⇒ उपयोगी कार्य = 250 W

 

⇒ η = 62.5%

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