Added(A)/Deleted(D) following books

 A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter40.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter41.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter43.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter44.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter45.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter46.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter47.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter49.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/chapter50.ipynb
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/screenshots/figure_1.png
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/screenshots/figure_2.png
A  A_TEXTBOOK_OF_ELECTRICAL_TECHNOLOGY_(VOL-III)_by_B.L.Thareja/screenshots/figure_3.png

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# CHAPTER 46 : ELECTRONIC CONTROL OF A.C MOTORS"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## EXAMPLE 46.1 , PAGE NO :- 1827"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Ton =  1.89 ms.\n",
+      "magnitude of the current pulse I0 = 102.31 A.\n"
+     ]
+    }
+   ],
+   "source": [
+    "'''The wound-rotor induction motor of Fig.43.5 is rated at 30-kW,975 rpm,440-V,50 Hz.The open-circuit line voltage is 400V and the load\n",
+    "resistance is 0.5 ohm.If chopper frequency is 200 Hz,calculate Ton so that the motor develops a gross torque of 200 N-m at 750 rpm.Also,\n",
+    "calculate the magnitude of the current pulses drawn from the capacitor.'''\n",
+    "\n",
+    "import math as m\n",
+    "Ns = 1000.0   #rpm       (Synchronus speed)\n",
+    "N1 = 750.0    #rpm       (rotating speed)\n",
+    "E2 = 400.0    #V         (OC line voltage)\n",
+    "Tg = 200.0    #N-m       (gross torque)\n",
+    "R0 = 0.5      #ohm       (load resistance)\n",
+    "f = 200.0     #Hz        (chopper frequency)\n",
+    "s = (Ns-N1)/Ns   # slip\n",
+    "Vrl = s*E2       #V       (rotor line voltage)\n",
+    "Vdc = 135.0      #V       (DC voltage of 3-phase bridge rectifier)\n",
+    "#Now, Tg = P^2/(2*3.14*Ns).Therefore,\n",
+    "P2 = Tg*2*3.14*Ns/60           #W\n",
+    "#Power dissipated as heat\n",
+    "sP2 = s*P2                      #W\n",
+    "#Power is actually dissipated in R and is equal to rectifier output Vdc*Idc.Therefore,\n",
+    "Idc =  sP2/Vdc         #A\n",
+    "#The apparent resistance at the input of chopper is\n",
+    "Ra = Vdc/Idc                     #ohm\n",
+    "#Now, Ra = Ro/(f*Ton)^2 .Therefore,\n",
+    "Ton = m.sqrt(R0/(f*f*Ra))*1000           #ms\n",
+    "#Current in R0 can be found from relation,I0^2*R0 = sP2\n",
+    "I0 = m.sqrt(sP2/R0)               #A\n",
+    "print \"Ton = \",round(Ton,2),\"ms.\"\n",
+    "print \"magnitude of the current pulse I0 =\",round(I0,2),\"A.\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}