1.0Johnson's Techworldhttps://johnsonfrancis.org/techworldJohnson Francishttps://johnsonfrancis.org/techworld/author/jf/rich600338<blockquote class="wp-embedded-content" data-secret="ViphoIYOrK"><a href="https://johnsonfrancis.org/techworld/ham-radio-exam-preparation-2/">Ham Radio Exam Preparation 2</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://johnsonfrancis.org/techworld/ham-radio-exam-preparation-2/embed/#?secret=ViphoIYOrK" width="600" height="338" title="“Ham Radio Exam Preparation 2” — Johnson's Techworld" data-secret="ViphoIYOrK" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script> /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://johnsonfrancis.org/techworld/wp-includes/js/wp-embed.min.js </script> https://johnsonfrancis.org/techworld/wp-content/uploads/2025/10/Ham-Radio-Exam-Preparation-2.jpg1201675Another session of ham radio exam preparation is here, with multiple choice questions followed by discussion with illustrations. The Transformer works on the principle ofa) Self Inductance b) Mutual Inductance c) both a & b d) None Transformer works on the principle of mutual inductance for transforming voltage, current and impedance. It has a primary […]