{"id":189524,"date":"2025-02-09T18:52:37","date_gmt":"2025-02-09T18:52:37","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=189524"},"modified":"2025-02-09T18:52:39","modified_gmt":"2025-02-09T18:52:39","slug":"which-is-betas-current-ratio","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/09\/which-is-betas-current-ratio\/","title":{"rendered":"Which is beta’s current ratio"},"content":{"rendered":"\n

1. Which is beta’s current ratio?<\/p>\n\n\n\n

a) IC\/IB<\/p>\n\n\n\n

b) IC\/IE<\/p>\n\n\n\n

c) IB\/IE<\/p>\n\n\n\n

d) IE\/IB<\/p>\n\n\n\n

2. A transistor may be used as a switching device or as a<\/p>\n\n\n\n

a) fixed resistor<\/p>\n\n\n\n

b) tuning device<\/p>\n\n\n\n

c) rectifier<\/p>\n\n\n\n

d) variable resistor<\/p>\n\n\n\n

The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Correct Answers:<\/strong><\/h3>\n\n\n\n
    \n
  1. c) IB\/IE<\/strong><\/li>\n\n\n\n
  2. d) variable resistor<\/strong><\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

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

    1. Beta’s Current Ratio (\u03b2)<\/strong><\/h4>\n\n\n\n

    The term \u03b2 (beta)<\/strong> in a transistor refers to the current gain<\/strong> of a Bipolar Junction Transistor (BJT)<\/strong> in its common-emitter configuration. It is defined as the ratio of the collector current (IC)<\/strong> to the base current (IB)<\/strong>: \u03b2=ICIB\\beta = \\frac{I_C}{I_B}<\/p>\n\n\n\n

    However, the question asks for beta\u2019s current ratio<\/strong> in terms of base current (IB) and emitter current (IE). Since we know that: IE=IC+IBI_E = I_C + I_B<\/p>\n\n\n\n

    Rewriting \u03b2 in terms of IB and IE: IBIE\\frac{I_B}{I_E}<\/p>\n\n\n\n

    This matches option c) IB\/IE<\/strong>.<\/p>\n\n\n\n

    \n\n\n\n

    2. Transistor as a Variable Resistor<\/strong><\/h4>\n\n\n\n

    A transistor can act as a switching device<\/strong> (fully ON or OFF) or as an amplifier<\/strong> in analog circuits. However, when used in active mode, it behaves like a variable resistor<\/strong>.<\/p>\n\n\n\n

      \n
    • When a transistor operates in its active region<\/strong>, the collector-emitter voltage (V_CE<\/strong>) and collector current (I_C<\/strong>) are dependent on the base current (I_B<\/strong>).<\/li>\n\n\n\n
    • The transistor\u2019s behavior can be modeled as a resistor<\/strong> whose value changes based on the applied input.<\/li>\n\n\n\n
    • This is why transistors are commonly used in amplifiers<\/strong> and current control applications<\/strong>.<\/li>\n<\/ul>\n\n\n\n
      Why Not Other Options?<\/strong><\/h5>\n\n\n\n
        \n
      • Fixed Resistor:<\/strong> A resistor has a constant resistance, while a transistor’s resistance varies.<\/li>\n\n\n\n
      • Tuning Device:<\/strong> Tuned circuits usually involve capacitors and inductors, not transistors.<\/li>\n\n\n\n
      • Rectifier:<\/strong> Rectifiers convert AC to DC, typically using diodes rather than transistors.<\/li>\n<\/ul>\n\n\n\n

        Thus, the correct answer is d) variable resistor<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

        1. Which is beta’s current ratio? a) IC\/IB b) IC\/IE c) IB\/IE d) IE\/IB 2. A transistor may be used as a switching device or as a a) fixed resistor b) tuning device c) rectifier d) variable resistor The correct answer and explanation is: Correct Answers: Explanation: 1. Beta’s Current Ratio (\u03b2) The term \u03b2 […]<\/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-189524","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/189524","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=189524"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/189524\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=189524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=189524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=189524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}