{"id":22932,"date":"2024-04-15T06:26:58","date_gmt":"2024-04-15T06:26:58","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=22932"},"modified":"2024-04-15T06:26:58","modified_gmt":"2024-04-15T06:26:58","slug":"in-a-bipolar-junction-transistor-a-all-the-three-regions-the-emitter-the-base-and-the-collector-have-equal-concentrations-of-impurity-b-the-emitter-has-the-least-concentration-of-impurity-c-the","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/in-a-bipolar-junction-transistor-a-all-the-three-regions-the-emitter-the-base-and-the-collector-have-equal-concentrations-of-impurity-b-the-emitter-has-the-least-concentration-of-impurity-c-the\/","title":{"rendered":"In a bipolar junction transistor A. All the three regions (the emitter, the base and the collector) have equal concentrations of impurity B. The emitter has the least concentration of impurity C. The collector has the least concentration of impurity D. The base has the least concentration of impurity"},"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_6a98e7b9157e1\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"true\">\r\n                    All the three regions (the emitter, the base and the collector) have equal concentrations of impurity                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    The emitter has the least concentration of impurity                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    The collector has the least concentration of impurity                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    The base has the least concentration of impurity                <\/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: The base has the least concentration of impurity.<\/p>\n<p>A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and holes as charge carriers. It is composed of three semiconductor regions: the emitter, the base, and the collector. The emitter and collector regions are heavily doped with impurities, while the base region is lightly doped.<\/p>\n<p>The emitter and collector regions are connected to external circuits, while the base region is connected to a small voltage source. When a voltage is applied to the base-emitter junction, a small current flows through the base region. This current causes a much larger current to flow through the emitter-collector junction. This is because the emitter and collector regions are heavily doped, and the base region is lightly doped.<\/p>\n<p>The base region is the control element of the BJT. The current through the base region controls the current through the emitter-collector junction. This makes the BJT a very versatile device that can be used as an amplifier, a switch, or a logic gate.<\/p>\n<p>The concentration of impurity in the base region is important because it determines the current gain of the BJT. The current gain is the ratio of the collector current to the base current. A higher current gain means that the BJT can amplify a smaller <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    <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>         <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> signal into a larger signal.<\/p>\n<p>The base region is lightly doped so that the current through the base region is small. This small current controls the much larger current through the emitter-collector junction. This makes the BJT a very efficient device.<\/p>\n<p>The other options are incorrect because they do not accurately describe the concentration of impurity in the three regions of a BJT.<\/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":[25],"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>In a bipolar junction transistor A. All the three regions (the emitter, the base and the collector) have equal concentrations of impurity B. The emitter has the least concentration of impurity C. The collector has the least concentration of impurity D. 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