[amp_mcq option1=”Natural graphite” option2=”Hard carbon” option3=”Electro graphitic” option4=”Metal graphite” correct=”option1″]<\/p>\n
The correct answer is: A. Natural graphite<\/strong><\/p>\n Natural graphite is a soft, brittle material that is easily worn away. This makes it unsuitable for use in brushes that come into contact with commutators, as it can cause excessive wear of the commutator.<\/p>\n Hard carbon is a more durable material than natural graphite, but it is still not as wear-resistant as electrographitic or metal graphite brushes. Electrographitic brushes are made from a mixture of graphite and metal powder, which gives them a higher degree of hardness and wear resistance. Metal graphite brushes are made from a mixture of graphite and metal, which gives them the highest degree of hardness and wear resistance of all the options.<\/p>\n In summary, natural graphite is the least wear-resistant material, followed by hard carbon, electrographitic brushes, and metal graphite brushes.<\/p>\n","protected":false},"excerpt":{"rendered":" [amp_mcq option1=”Natural graphite” option2=”Hard carbon” option3=”Electro graphitic” option4=”Metal graphite” correct=”option1″]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[741],"tags":[],"class_list":["post-53639","post","type-post","status-publish","format-standard","hentry","category-electrical-machine-design","no-featured-image-padding"],"yoast_head":"\n