'; OutString += ''; OutString += NavBar; if (Feedback.length>0){ OutString += '' } OutString += '

'; OutString += ''; OutString += Feedback; OutString += '

'; //Write it to the frame TopFrame.document.clear(); TopFrame.document.open(); TopFrame.document.write(OutString); TopFrame.document.close(); } function StartUp(){ //Write the top frame WriteFeedback(Instructions); if ((is.mac)&&(is.ns)) { FocusBoxes = false; } //Reduce array if required if (QsToShow < I.length){ ReduceItems(); } //Shuffle stuff if required if (ShuffleQs == true){ I = Shuffle(I); } //Create arrays CreateStatusArrays(); //Show the first question or all of them if (ShowOneByOne == false){ ShowAllQs(); } else{ ShowQuestion(CurrQNum); } //Focus the first box var Box = eval('BottomFrame.document.QForm0.Guess'); if (Box != null){ Box.focus(); } } I = new Array(); I[0] = new Array(); I[0][0]='Dato un circuito costituito da un diodo con tensione di soglia Vs in serie ad una resistenza di carico Rl alimentato da un generatore di tensione sinusoidale con tensione massima Vgmax; scrivere la formula che esprime il valore massimo della tensione di uscita ai capi della Rl: Vomax=....'; I[0][1] = new Array(); I[0][1][0] = new Array(); I[0][1][0][0]='Vomax=Vgmax-Vs'; I[1] = new Array(); I[1][0]='Dato un circuito raddrizzatore a doppia semionda costituito da quattro diodi con tensione di soglia Vs (ponte di Graetz) in serie ad una resistenza di carico Rl alimentato da un generatore di tensione sinusoidale con tensione massima Vgmax; scrivere la formula che esprime il valore massimo della tensione di uscita ai capi della Rl: Vomax=....'; I[1][1] = new Array(); I[1][1][0] = new Array(); I[1][1][0][0]='Vomax=Vgmax-2*Vs'; I[2] = new Array(); I[2][0]='Ad un circuito raddrizzatore ad una semionda costituito da un diodo con tensione di soglia Vs in serie ad una resistenza di carico Rl viene collegato un condensatore elettrolitico C in parallelo ad Rl ottenendo un alimentatore stabilizzato; la tensione di uscita, visualizzata con un\'oscilloscopio, varia tra un valore massimo Vomax ed un valore minimo Vomin; la tensione media fornita da tale generatore \u00E8 espressa dalla formula: Vom=....'; I[2][1] = new Array(); I[2][1][0] = new Array(); I[2][1][0][0]='Vom=(Vomax-Vomin)/2+Vomin'; I[3] = new Array(); I[3][0]='Se al circuito stabilizzato precedente aggiungiamo in uscita una resistenza Rz ed un diodo zener con tensione Vz minore di Vomin; la tensione stabilizzata di uscita \u00E8 espressa dall\'equazione: Vo=.....'; I[3][1] = new Array(); I[3][1][0] = new Array(); I[3][1][0][0]='Vo=Vz'; Status = new Array(); function CreateStatusArrays(){ Status.length = 0; for (i=0; i-1){ FirstBit = InString.substring(0, i); LastBit = InString.substring(i + Token.length, InString.length); InString = FirstBit + Replacement + LastBit; i = InString.indexOf(Token); } return InString; } function ChangeQ(ChangeBy){ var NewNum = CurrQNum + ChangeBy; if ((NewNum >= 0)&&(NewNum Longest){ Longest = I[QNum][1][i][0].length; } } var AnsBox = ''; if (Longest > 20){ AnsBox = LongAnswer; } else{ AnsBox = ReplaceStuff('[AnswerSize]', (Longest + ''), ShortAnswer); } var AnsRow = ReplaceStuff('[AnswerBox]', AnsBox, ARow); Temp += AnsRow; Temp += BtnRow; Temp = ReplaceStuff('[QNumber]', QNum+1, Temp); Temp = ReplaceStuff('[QNum]', QNum, Temp); return Temp; } function DisplayExercise(StuffToDisplay){ //Build the output string var OutString = ''; OutString += ''; OutString += '

'; OutString += ''; OutString += TitleCode; OutString += ''; OutString += NavBar; OutString += '

'; OutString += ''; OutString += StuffToDisplay; OutString += '

'; if (is.CRAPBrowser){OutString=ResolveAllURLs(OutString);} //Write it to the frame BottomFrame.document.clear(); BottomFrame.document.open(); BottomFrame.document.write(OutString); BottomFrame.document.close(); } function ShowAllQs(){ var Output = ''; for (var i=0; i

---

'; } Output = Output + BuildQuestion(I.length-1); Output = TableOpener + Output + TableCloser; DisplayExercise(Output); } function ShowQuestion(QNum){ //First, create the Q number readout at the top var Readout = (QNum+1) + '/' + I.length; while (Readout.length < 7){ Readout = ' ' + Readout + ' '; } Readout = QButtonsOpener + Readout + QButtonsCloser; var Output = BuildQuestion(QNum); Output = TableOpener + Output + TableCloser; DisplayExercise(Readout + Output); //Replace the student's answer var Box = eval('BottomFrame.document.QForm' + QNum + '.Guess'); if (Box != null){ if (Status[QNum][3].length > 0){ Box.value = Status[QNum][3]; } Box.focus(); } } function TrimString(InString){ var x = 0 if (InString.length != 0) { while ((InString.charAt(InString.length - 1) == '\u0020') || (InString.charAt(InString.length - 1) == '\u000A') || (InString.charAt(InString.length - 1) == '\u000D')){ InString = InString.substring(0, InString.length - 1) } while ((InString.charAt(0) == '\u0020') || (InString.charAt(0) == '\u000A') || (InString.charAt(0) == '\u000D')){ InString = InString.substring(1, InString.length) } while (InString.indexOf(' ') != -1) { x = InString.indexOf(' ') InString = InString.substring(0, x) + InString.substring(x+1, InString.length) } return InString; } else { return ''; } } function RemovePunctuation(InString){ var OutString = ''; for (i=0; i InArray[Longest].length){ Longest = i; } } return Longest; } function CheckWords(Guess, Answer){ var Start = 0; var End = 0; var LoopCounter = 0; var ReturnList = ''; var i = 0; var j = 0; GuessWords = new Array(); AnswerWords = new Array(); Guess = RemovePunctuation(Guess); Answer = RemovePunctuation(Answer); while (Guess.indexOf(' ', Start) > -1) { End = Guess.indexOf(' ', Start); GuessWords[LoopCounter] = Guess.substring(Start, End).toLowerCase(); LoopCounter++; Start = End + 1; } GuessWords[LoopCounter] = Guess.substring(Start, Guess.length).toLowerCase(); Start = 0; LoopCounter = 0; while (Answer.indexOf(' ', Start) > -1) { End = Answer.indexOf(' ', Start); AnswerWords[LoopCounter] = Answer.substring(Start, End); LoopCounter++; Start = End + 1; } AnswerWords[LoopCounter] = Answer.substring(Start, Answer.length); ReturnList = ''; for (i = 0; i < GuessWords.length; i++){ for (j = 0; j < AnswerWords.length; j++){ if (GuessWords[i] == AnswerWords[j].toLowerCase()){ ReturnList = ReturnList + AnswerWords[j] + ', ' ; AnswerWords[j] = ''; break; } } } if (ReturnList.length > 0){ ReturnList = ReturnList.substring(0, ReturnList.length - 2); } return ReturnList; } function CalculateScore(){ Score = 0; var DoneQs = 0; for (i=0; i';}; } if (Right > -1){ Status[QNum][0] = 1; Output = CorrectResponse + ' '; if (OtherAnswers.length > 0){ Output += TheseAnswersToo + '
' + OtherAnswers; } //Get the score for this question var HintPenalty = (Status[QNum][2]*10)/CorrectAs[Right].length; Status[QNum][4] = Math.floor((10 - Status[QNum][1]) - HintPenalty); //Check whether the quiz is finished var Finished = true; for (var i=0; i 0){ CorrectBits[0][i] = RealAs[i].substring(0,CorrectBits[0][i].length); } CorrectBits[1][i] = CheckEnd(Guess, CorrectAs[i]); if (CorrectBits[1][i].length > 0){ CorrectBits[1][i] = RealAs[i].substring(RealAs[i].length-CorrectBits[1][i].length,RealAs[i].length); } CorrectBits[2][i] = CorrectBits[0][i] + ' ... ' + CorrectBits[1][i]; CorrectBits[3][i] = CorrectBits[0][i] + RealAs[i].charAt(CorrectBits[0][i].length); if (CorrectBits[3][i].charAt(CorrectBits[3][i].length-1) == ' '){ CorrectBits[3][i] += RealAs[i].charAt(CorrectBits[3][i].length); } CorrectBits[3][i] += '...' } var LongestCorrect = FindLongest(CorrectBits[2]); if (CorrectBits[2][LongestCorrect].length > 5){ Output = ThisMuchIsCorrect + '
' + CorrectBits[2][LongestCorrect]; } else{ if (ShowHint == false){ Output = IncorrectResponse; } } //Include words found in the answer var FoundWords = CheckWords(Guess, CorrectAs[LongestCorrect]); if (FoundWords.length > 0){ Output += '
' + TheseWordsAppear + FoundWords; } if (ShowHint == true){ Output += '
' + GiveHint + CorrectBits[3][LongestCorrect]; } WriteFeedback(Output); //Put the focus back in the box if (FocusBoxes==true){ eval('BottomFrame.document.QForm' + (QNum) + '.Guess').focus(); } } } function ShowAnswers(QNum){ //If the question isn't done, mark it as done. Score will be 0; Status[QNum][0] = 1; Status[QNum][1] = -1; Status[QNum][2] = -1; //Get the correct answers and put them into a string var Output = TheseCorrect + '
'; Output += I[QNum][1][0][0] + '
'; for (var i=1; i'; } //Add the current score Output += YourScoreIs + ' ' + CalculateScore() + '%. '; WriteFeedback(Output); return true; } function Blank(){ return '

©Half-Baked Software. Loading...

'; } //--> //]]>

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