खरोंचनी का बिंदु कोण क्या होता है?

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ALP CBT 2 Fitter Official Paper: Held on 21 Jan 2019 Shift 2
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  1. 40° से 50°
  2. 60° से 90°
  3. 10° से 20°
  4. 12° से 15°

Answer (Detailed Solution Below)

Option 4 : 12° से 15°
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  • धातुकर्म में खरोंचनी का प्रयोग निर्माण के पहले कार्य-वस्तु पर रेखाएँ खींचने के लिए किया जाता है
  • खरोंचनी की सूक्ष्मतः टेपर की हुई और सूक्ष्म बिंदु नोक पतली और अधिक परिशुद्ध रेखा खींचती है, साथ ही यह बहुत निकट रेखाएँ खींचने में भी उपयुक्त है
  • लेकिन अधिक सूक्ष्म नोक जल्दी घिस जाती है और उसे बार - बार नुकीला करना पड़ता है और यह आसानी से टूट भी जाती है
  • इसलिए 12° से 15° डिग्री अधिक उपयुक्त है
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