{"id":51035,"date":"2024-04-15T23:18:59","date_gmt":"2024-04-15T23:18:59","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=51035"},"modified":"2024-04-15T23:18:59","modified_gmt":"2024-04-15T23:18:59","slug":"what-will-happen-if-the-back-e-m-f-of-a-d-c-motor-vanishes-suddenly","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/what-will-happen-if-the-back-e-m-f-of-a-d-c-motor-vanishes-suddenly\/","title":{"rendered":"What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;The motor will stop&#8221; option2=&#8221;The motor will continue to run&#8221; option3=&#8221;motor vanishes suddenly? A. The motor will stop B. The motor will continue to run C. The armature may burn&#8221; option4=&#8221;The motor will run noisy&#8221; correct=&#8221;option1&#8243;]<!--more--><\/p>\n<p>The correct answer is A. The motor will stop.<\/p>\n<p>The back EMF is an induced voltage that opposes the applied voltage in a DC motor. It is generated by the rotation of the armature coils in the magnetic field of the stator. The back EMF increases with the speed of the motor.<\/p>\n<p>If the back EMF vanishes suddenly, the applied voltage will be unopposed and the current will increase rapidly. This will cause the motor to overheat and stop.<\/p>\n<p>Option B is incorrect because the motor will not continue to run if the back EMF vanishes suddenly.<\/p>\n<p>Option C is incorrect because the armature will not burn if the back EMF vanishes suddenly. The armature may burn if the motor overheats, but this is not caused by the vanishing of the back EMF.<\/p>\n<p>Option D is incorrect because the motor will not run noisy if the back EMF vanishes suddenly. The motor may run noisy if it overheats, but this is not caused by the vanishing of the back EMF.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;The motor will stop&#8221; option2=&#8221;The motor will continue to run&#8221; option3=&#8221;motor vanishes suddenly? A. The motor will stop B. The motor will continue to run C. The armature may burn&#8221; option4=&#8221;The motor will run noisy&#8221; correct=&#8221;option1&#8243;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[743],"tags":[],"class_list":["post-51035","post","type-post","status-publish","format-standard","hentry","category-d-c-motors","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/what-will-happen-if-the-back-e-m-f-of-a-d-c-motor-vanishes-suddenly\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;The motor will stop&#8221; option2=&#8221;The motor will continue to run&#8221; option3=&#8221;motor vanishes suddenly? 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The armature may burn&#8221; option4=&#8221;The motor will run noisy&#8221; correct=&#8221;option1&#8243;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/what-will-happen-if-the-back-e-m-f-of-a-d-c-motor-vanishes-suddenly\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T23:18:59+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/what-will-happen-if-the-back-e-m-f-of-a-d-c-motor-vanishes-suddenly\/","og_locale":"en_US","og_type":"article","og_title":"What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?","og_description":"[amp_mcq option1=&#8221;The motor will stop&#8221; option2=&#8221;The motor will continue to run&#8221; option3=&#8221;motor vanishes suddenly? 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