0.2 s के धारा प्रवाह समय के साथ 1 mm मोटी शीट के बिंदु वेल्डन के लिए उत्पादित ऊष्मा 1000 J है। यदि प्रभावी प्रतिरोध 200 μΩ है, तो आवश्यक धारा क्या है?

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ESE Mechanical 2018 Official Paper
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  1. 4000 A
  2. 5000 A
  3. 6000 A
  4. 7000 A

Answer (Detailed Solution Below)

Option 2 : 5000 A
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins

Detailed Solution

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संकल्पना:

बिंदु वेल्डन में उत्पादित ऊष्मा (Q) को निम्न द्वारा ज्ञात किया गया है, Q = I2 × R × t

जहाँ I धारा का प्रवाह है, R प्रतिरोध है और t वह अवधि है जिसके लिए धारा प्रवाहित होती है। 

गणना:

दिया गया है, धारा प्रवाह समय t = 0.2 s, उत्पादित ऊष्मा = 1000 J और, प्रतिरोध = 200 μΩ

1000 = I2 × 200 × 10-6 × 0.2

I = 5000 A

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