{"id":53760,"date":"2024-04-15T23:58:41","date_gmt":"2024-04-15T23:58:41","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=53760"},"modified":"2024-04-15T23:58:41","modified_gmt":"2024-04-15T23:58:41","slug":"for-a-d-c-shunt-motor-if-the-excitation-is-changed","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/","title":{"rendered":"For a D.C. shunt motor if the excitation is changed"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;Torque will remain constant&#8221; option2=&#8221;Torque will change but power will remain constant&#8221; option3=&#8221;shunt motor if the excitation is changed A. Torque will remain constant B. Torque will change but power will remain constant C. Torque and power both will change&#8221; option4=&#8221;Torque, power and speed, all will change&#8221; correct=&#8221;option3&#8243;]<!--more--><\/p>\n<p>The correct answer is: <strong>C. Torque and power both will change<\/strong>.<\/p>\n<p>Explanation:<\/p>\n<p>The torque of a DC shunt motor is proportional to the field current. When the excitation is changed, the field current changes, and the torque changes accordingly. The power of a DC shunt motor is proportional to the square of the armature current. When the excitation is changed, the armature current changes, and the power changes accordingly.<\/p>\n<p>Here is a more detailed explanation of each option:<\/p>\n<ul>\n<li>Option A: Torque will remain constant. This is incorrect because the torque of a DC shunt motor is proportional to the field current. When the excitation is changed, the field current changes, and the torque changes accordingly.<\/li>\n<li>Option B: Torque will change but power will remain constant. This is incorrect because the power of a DC shunt motor is proportional to the square of the armature current. When the excitation is changed, the armature current changes, and the power changes accordingly.<\/li>\n<li>Option C: Torque and power both will change. This is the correct answer because the torque and power of a DC shunt motor are both proportional to the field current. When the excitation is changed, the field current changes, and the torque and power both change accordingly.<\/li>\n<li>Option D: Torque, power and speed, all will change. This is incorrect because the speed of a DC shunt motor is proportional to the applied voltage. When the excitation is changed, the speed does not change.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;Torque will remain constant&#8221; option2=&#8221;Torque will change but power will remain constant&#8221; option3=&#8221;shunt motor if the excitation is changed A. Torque will remain constant B. Torque will change but power will remain constant C. Torque and power both will change&#8221; option4=&#8221;Torque, power and speed, all will change&#8221; correct=&#8221;option3&#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-53760","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>For a D.C. shunt motor if the excitation is changed<\/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\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"For a D.C. shunt motor if the excitation is changed\" \/>\n<meta property=\"og:description\" content=\"[amp_mcq option1=&#8221;Torque will remain constant&#8221; option2=&#8221;Torque will change but power will remain constant&#8221; option3=&#8221;shunt motor if the excitation is changed A. Torque will remain constant B. Torque will change but power will remain constant C. 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Torque will remain constant B. Torque will change but power will remain constant C. Torque and power both will change&#8221; option4=&#8221;Torque, power and speed, all will change&#8221; correct=&#8221;option3&#8243;]","og_url":"https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T23:58:41+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\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/","url":"https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/","name":"For a D.C. shunt motor if the excitation is changed","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2024-04-15T23:58:41+00:00","dateModified":"2024-04-15T23:58:41+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/for-a-d-c-shunt-motor-if-the-excitation-is-changed\/#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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