{"id":53783,"date":"2024-04-15T23:59:02","date_gmt":"2024-04-15T23:59:02","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=53783"},"modified":"2024-04-15T23:59:02","modified_gmt":"2024-04-15T23:59:02","slug":"if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/","title":{"rendered":"If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a9820fbb3e27\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"true\">\r\n                    This will make armature to take heavy current, possibly burning it                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    shunt motor is working at full load and if shunt field circuit suddenly opens A. This will make armature to take heavy current, possibly burning it B. This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses C. Nothing will happen to motor                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    Motor will come to stop                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is A. This will make armature to take heavy current, possibly burning it.<\/p>\n<p>When the <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n        <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div>     Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> shunt field circuit of a DC shunt motor suddenly opens, the field current decreases to zero. This causes the magnetic field to collapse, which in turn causes the armature current to increase. The increased armature current causes the motor to speed up. If the armature current is allowed to increase too much, the armature windings may overheat and burn out.<\/p>\n<p>To prevent this from happening, a current-limiting device is usually connected in series with the armature. This device will limit the armature current to a safe value, even if the field current is zero.<\/p>\n<p>Here is a more detailed explanation of each option:<\/p>\n<ul>\n<li>Option A: This will make armature to take heavy current, possibly burning it.<\/li>\n<\/ul>\n<p>When the shunt field circuit of a DC shunt motor suddenly opens, the field current decreases to zero. This causes the magnetic field to collapse, which in turn causes the armature current to increase. The increased armature current causes the motor to speed up. If the armature current is allowed to increase too much, the armature windings may overheat and burn out.<\/p>\n<ul>\n<li>Option B: This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses.<\/li>\n<\/ul>\n<p>This is not correct. The armature current will increase, but the speed will not increase excessively. The current-limiting device will limit the armature current to a safe value, even if the field current is zero.<\/p>\n<ul>\n<li>Option C: Nothing will happen to motor.<\/li>\n<\/ul>\n<p>This is not correct. The armature current will increase, and the motor will speed up. If the armature current is allowed to increase too much, the armature windings may overheat and burn out.<\/p>\n<ul>\n<li>Option D: Motor will come to stop.<\/li>\n<\/ul>\n<p>This is not correct. The motor will not come to stop. The armature current will increase, and the motor will speed up. If the armature current is allowed to increase too much, the armature windings may overheat and burn out.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/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":[],"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>If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens<\/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\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens\" \/>\n<meta property=\"og:description\" content=\"Join Our Telegram Channel Subscribe on YouTube\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T23:59:02+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=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens","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\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/","og_locale":"en_US","og_type":"article","og_title":"If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens","og_description":"Join Our Telegram Channel Subscribe on YouTube","og_url":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T23:59:02+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/","url":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/","name":"If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2024-04-15T23:59:02+00:00","dateModified":"2024-04-15T23:59:02+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/if-a-d-c-shunt-motor-is-working-at-full-load-and-if-shunt-field-circuit-suddenly-opens\/#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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