{"id":181070,"date":"2025-01-09T13:39:11","date_gmt":"2025-01-09T13:39:11","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=181070"},"modified":"2025-01-09T13:39:13","modified_gmt":"2025-01-09T13:39:13","slug":"the-fact-that-a-voltage-can-be-created-by-exerting-force-on-a-crystal-is-used-in-which-type-of-sensor","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/09\/the-fact-that-a-voltage-can-be-created-by-exerting-force-on-a-crystal-is-used-in-which-type-of-sensor\/","title":{"rendered":"The fact that a voltage can be created by exerting force on a crystal is used in which type of sensor"},"content":{"rendered":"\n

The fact that a voltage can be created by exerting force on acrystal is used in which type of sensor?<\/p>\n\n\n\n

a. Throttle position (TP)<\/p>\n\n\n\n

b. Manifold absolute pressure (MAP)<\/p>\n\n\n\n

c. Barometric pressure (BARO)<\/p>\n\n\n\n

d. Knock sensor (KS)<\/p>\n\n\n\n

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

The correct answer is d. Knock sensor (KS)<\/strong>.<\/p>\n\n\n\n

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

The principle that voltage can be generated by exerting force on a crystal is based on piezoelectricity<\/strong>, a property of certain materials, including specific crystals and ceramics. Piezoelectric materials generate an electric charge when subjected to mechanical stress or force. This property is exploited in various sensors, including knock sensors (KS)<\/strong> used in modern automotive engines.<\/p>\n\n\n\n

In an engine, a knock sensor<\/strong> is used to detect engine knocking or detonation. Engine knocking occurs when fuel in the cylinder ignites prematurely, causing a characteristic knocking or pinging sound. This premature ignition can lead to inefficient combustion, increased engine temperatures, and potential engine damage.<\/p>\n\n\n\n

The knock sensor typically contains a piezoelectric crystal<\/strong>. When the engine experiences knocking, vibrations and mechanical forces are transmitted to the sensor. These mechanical forces create a voltage in the piezoelectric material, which is then converted into an electrical signal. The engine control unit (ECU) receives this signal, interprets it, and adjusts the ignition timing to prevent knocking. The ECU may retard the timing, ensuring the combustion process occurs at the optimal point, improving engine performance and protecting the engine from damage.<\/p>\n\n\n\n

The other options (TP, MAP, BARO)<\/strong> involve sensors that measure physical properties such as position, pressure, and barometric pressure, but they do not utilize the piezoelectric effect. Here’s a brief look at each:<\/p>\n\n\n\n

    \n
  • Throttle Position (TP) Sensor<\/strong>: Measures the position of the throttle valve to determine how much air is entering the engine.<\/li>\n\n\n\n
  • Manifold Absolute Pressure (MAP) Sensor<\/strong>: Measures the pressure in the intake manifold to help determine engine load.<\/li>\n\n\n\n
  • Barometric Pressure (BARO) Sensor<\/strong>: Measures the atmospheric pressure to help the ECU adjust fuel and air mixture.<\/li>\n<\/ul>\n\n\n\n

    These sensors rely on other principles like resistive, capacitive, or inductive changes, not piezoelectricity. Therefore, knock sensors<\/strong> are the correct application of piezoelectricity.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The fact that a voltage can be created by exerting force on acrystal is used in which type of sensor? a. Throttle position (TP) b. Manifold absolute pressure (MAP) c. Barometric pressure (BARO) d. Knock sensor (KS) The Correct Answer and Explanation is : The correct answer is d. Knock sensor (KS). Explanation: The principle […]<\/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-181070","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181070","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=181070"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/181070\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=181070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=181070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=181070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}