{"id":49830,"date":"2024-04-15T23:01:33","date_gmt":"2024-04-15T23:01:33","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=49830"},"modified":"2024-04-15T23:01:33","modified_gmt":"2024-04-15T23:01:33","slug":"the-condition-for-maximum-power-in-case-of-d-c-motor-is","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/","title":{"rendered":"The condition for maximum power in case of D.C. motor is"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;Back e.m.f. = 2 \u00c3\u0097 supply voltage&#8221; option2=&#8221;Back e.m.f. = $$\\frac{1}{2}$$ \u00c3\u0097 supply voltage&#8221; option3=&#8221;motor is A. Back e.m.f. = 2 \u00c3\u0097 supply voltage B. Back e.m.f. = $$\\frac{1}{2}$$ \u00c3\u0097 supply voltage C. Supply voltage = $$\\frac{1}{2}$$ \u00c3\u0097 back e.m.f.&#8221; option4=&#8221;Supply voltage = back e.m.f.&#8221; correct=&#8221;option4&#8243;]<!--more--><\/p>\n<p>The correct answer is: D. Supply voltage = back e.m.f.<\/p>\n<p>The back emf of a DC motor is the voltage that is generated by the motor itself. It opposes the applied voltage, and the difference between the two is the voltage that drives the current through the motor. The power in a DC motor is given by the equation $P = I^2R$, where $I$ is the current and $R$ is the resistance of the motor.<\/p>\n<p>When the back emf is equal to the applied voltage, the current through the motor is zero. This means that there is no power loss in the motor, and the maximum power is transferred from the power source to the motor.<\/p>\n<p>The other options are incorrect because they do not result in zero current through the motor. Option A would result in a current of 2 times the rated current, which would cause the motor to overheat. Option B would result in a current of half the rated current, which would not provide enough power to the motor. Option C would result in a current that is undefined, as the back emf and the applied voltage are in opposite directions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;Back e.m.f. = 2 \u00c3\u0097 supply voltage&#8221; option2=&#8221;Back e.m.f. = $$\\frac{1}{2}$$ \u00c3\u0097 supply voltage&#8221; option3=&#8221;motor is A. Back e.m.f. = 2 \u00c3\u0097 supply voltage B. Back e.m.f. = $$\\frac{1}{2}$$ \u00c3\u0097 supply voltage C. Supply voltage = $$\\frac{1}{2}$$ \u00c3\u0097 back e.m.f.&#8221; option4=&#8221;Supply voltage = back e.m.f.&#8221; correct=&#8221;option4&#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-49830","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>The condition for maximum power in case of D.C. motor is<\/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\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The condition for maximum power in case of D.C. motor is\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;Back e.m.f. = 2 \u00c3\u0097 supply voltage&#8221; option2=&#8221;Back e.m.f. = $$frac{1}{2}$$ \u00c3\u0097 supply voltage&#8221; option3=&#8221;motor is A. Back e.m.f. = 2 \u00c3\u0097 supply voltage B. Back e.m.f. = $$frac{1}{2}$$ \u00c3\u0097 supply voltage C. Supply voltage = $$frac{1}{2}$$ \u00c3\u0097 back e.m.f.&#8221; option4=&#8221;Supply voltage = back e.m.f.&#8221; correct=&#8221;option4&#8243;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T23:01:33+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":"The condition for maximum power in case of D.C. motor is","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\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/","og_locale":"en_US","og_type":"article","og_title":"The condition for maximum power in case of D.C. motor is","og_description":"[amp_mcq option1=&#8221;Back e.m.f. = 2 \u00c3\u0097 supply voltage&#8221; option2=&#8221;Back e.m.f. = $$frac{1}{2}$$ \u00c3\u0097 supply voltage&#8221; option3=&#8221;motor is A. Back e.m.f. = 2 \u00c3\u0097 supply voltage B. Back e.m.f. = $$frac{1}{2}$$ \u00c3\u0097 supply voltage C. Supply voltage = $$frac{1}{2}$$ \u00c3\u0097 back e.m.f.&#8221; option4=&#8221;Supply voltage = back e.m.f.&#8221; correct=&#8221;option4&#8243;]","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T23:01:33+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/","name":"The condition for maximum power in case of D.C. motor is","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2024-04-15T23:01:33+00:00","dateModified":"2024-04-15T23:01:33+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-condition-for-maximum-power-in-case-of-d-c-motor-is\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"mcq","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/mcq\/"},{"@type":"ListItem","position":3,"name":"Electrical engineering","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/mcq\/electrical-engineering\/"},{"@type":"ListItem","position":4,"name":"D.c. 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