{"id":181681,"date":"2025-01-11T09:00:03","date_gmt":"2025-01-11T09:00:03","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=181681"},"modified":"2025-01-11T09:00:08","modified_gmt":"2025-01-11T09:00:08","slug":"diode-is-a-three-layer-semiconductor-device-that-has-two-terminals","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/11\/diode-is-a-three-layer-semiconductor-device-that-has-two-terminals\/","title":{"rendered":"Diode is a three layer semiconductor device that has two terminals"},"content":{"rendered":"\n

Diode is a three layer semiconductor device that has two terminals. TRUE or FALSE2.The diode is said to be reversed biased when anode is more positive than the cathode. TRUE or FALSE.3.When cathode is more positive than the anode, the diode is said to be forward biased. TRUE or FALSE.4.During turn OFF of a diode, the charges stored in the diffusion region has to be increased. TRUE or FALSE.5.The bipolar junction transistor (BJT) is a two terminal device. TRUE or FALSE.6.The bipolar junction transistor (BJT) is a metallic device. TRUE or FALSE.7.The bipolar junction transistor (BJT) is a three layer device. TRUE or FALSE.8.Based on the doping type the two types of BJT are _ and <\/strong><\/em><\/strong>.9.The ratio a collector current to the base current is given as ‘alpha’. TRUE or FALSE.10.Thyristor is a generic name for a three or more layer semiconductor device. TRUE or FALSE.11.MOSFET is a current control device. TRUE or FALSE.12.Application of a<\/em> voltage to the anode cathode of an SCR will reverse-bias it.<\/p>\n\n\n\n

The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n

Here are the answers with explanations for each statement:<\/p>\n\n\n\n

    \n
  1. FALSE<\/strong> \u2013 A diode is a two-layer semiconductor device (not three). It has a p-type<\/strong> layer and an n-type<\/strong> layer, and these form a p-n junction<\/strong>. It has two terminals: anode and cathode.<\/li>\n\n\n\n
  2. FALSE<\/strong> \u2013 A diode is reverse biased<\/strong> when the cathode<\/strong> is more positive than the anode<\/strong>. In reverse bias, the current does not flow, and the diode acts as an open circuit.<\/li>\n\n\n\n
  3. FALSE<\/strong> \u2013 A diode is forward biased<\/strong> when the anode<\/strong> is more positive than the cathode<\/strong>. In forward bias, the current flows through the diode.<\/li>\n\n\n\n
  4. FALSE<\/strong> \u2013 During the turn-off of a diode, the charges stored in the diffusion region<\/strong> must be removed<\/strong>, not increased. This is to stop current flow, as the diode needs to become non-conductive when it turns off.<\/li>\n\n\n\n
  5. FALSE<\/strong> \u2013 A BJT (Bipolar Junction Transistor)<\/strong> is a three-terminal<\/strong> device. The three terminals are emitter<\/strong>, base<\/strong>, and collector<\/strong>.<\/li>\n\n\n\n
  6. FALSE<\/strong> \u2013 The BJT<\/strong> is not a metallic device. It is a semiconductor device<\/strong> made of three layers of semiconductor material (p-n-p or n-p-n).<\/li>\n\n\n\n
  7. TRUE<\/strong> \u2013 The BJT<\/strong> is a three-layer device<\/strong>. It consists of three layers of semiconductor material, which can either be p-type<\/strong> or n-type<\/strong>, forming the emitter<\/strong>, base<\/strong>, and collector<\/strong>.<\/li>\n\n\n\n
  8. NPN and PNP<\/strong> \u2013 The two types of BJTs are NPN<\/strong> and PNP<\/strong>, depending on the arrangement of the p-type and n-type materials.<\/li>\n\n\n\n
  9. TRUE<\/strong> \u2013 The ratio of the collector current<\/strong> to the base current<\/strong> in a BJT is given as alpha (\u03b1)<\/strong>, which is the current gain of the transistor.<\/li>\n\n\n\n
  10. TRUE<\/strong> \u2013 A thyristor<\/strong> is a generic name for a semiconductor device with three or more layers<\/strong>. It typically has four layers (PNPN) and is used in switching applications.<\/li>\n\n\n\n
  11. FALSE<\/strong> \u2013 A MOSFET<\/strong> (Metal-Oxide-Semiconductor Field-Effect Transistor) is a voltage-controlled<\/strong> device, not a current-controlled one. The current in a MOSFET is controlled by the voltage applied to the gate.<\/li>\n\n\n\n
  12. Negative<\/strong> \u2013 Application of a negative<\/strong> voltage to the anode-cathode<\/strong> of an SCR<\/strong> (Silicon-Controlled Rectifier) will reverse bias<\/strong> it, preventing current flow.<\/li>\n<\/ol>\n\n\n\n

    Explanation:<\/h3>\n\n\n\n

    Semiconductor devices like diodes, BJTs, MOSFETs, and thyristors are essential in controlling current flow. A diode<\/strong> only allows current to flow in one direction when forward biased and blocks it when reverse biased. BJTs<\/strong> are used for amplification, with NPN<\/strong> and PNP<\/strong> types differing in the direction of current flow. MOSFETs<\/strong> are voltage-controlled and offer faster switching for digital applications. Thyristors<\/strong> are used in power control because they can switch large amounts of current when triggered properly, and SCRs<\/strong> need a negative bias to stop current flow. These properties make semiconductors vital for a variety of electronic and power systems.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Diode is a three layer semiconductor device that has two terminals. TRUE or FALSE2.The diode is said to be reversed biased when anode is more positive than the cathode. TRUE or FALSE.3.When cathode is more positive than the anode, the diode is said to be forward biased. TRUE or FALSE.4.During turn OFF of a diode, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-181681","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=181681"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181681\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=181681"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=181681"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=181681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}