﻿<?xml version="1.0" encoding="UTF-8"?>
<quiz>
<question type="category">
<category>
<text>$course$/Modern modulation methods/Modern modulation methods</text>
</category>
</question>
<question type="multichoice">
<name>
<text><![CDATA[CSRZ stands for:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[CSRZ stands for:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[Carrier Suppressed Return to Zero]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Chirp Suppressed Return to Zero]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Carrier Shift Return to Zero]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Chirp Shift Return to Zero]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Duobinary Modulation:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Duobinary Modulation:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[is a phase modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is a frequency modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[is an amplitude modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is a differential amplitude modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[One of the benefits of Returning to Zero in digital modulations is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[One of the benefits of Returning to Zero in digital modulations is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[greater tolerance to random polarization]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[greater tolerance to the frequency chirp]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[immunity to single errors]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[immunity to chromatic dispersion]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[In Carrier-Suppressed Return-to-Zero:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[In Carrier-Suppressed Return-to-Zero:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[phase at the carrier frequency is altered by π, when binary O occurs]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[phase at the carrier frequency is altered by π at every bit, no matter if it is binary O or 1]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[phase at the carrier frequency is altered by π, when binary 1 occurs]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[phase at the carrier frequency is altered by (2 n + 1), where n is bit number]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[A transceiver:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[A transceiver:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[is a simplifier digital signal processor used to implement the modulation algorithm]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[can operate as in-line amplifier for a modulator]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[includes a transmitter and a receiver]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[contains an Mach-Zehnder modulator combined with a filter]]></text>
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<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[In Alternate Mark Inversion:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[In Alternate Mark Inversion:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[has three logical levels 0, +1 and -1]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[has two logical levels 0 and 1]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[has four logical levels 00, O1, 10, 11]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[has many adaptive logical levels]]></text>
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<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[One of the benefits of Alternate Mark Inversion is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[One of the benefits of Alternate Mark Inversion is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[good synchronization of long strings of binary zeros]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[good synchronization of long strings of binary ones]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[good synchronization of long strings of binary zeros or binary ones]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[suppression of the carrier frequency]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The principle of Duobinary Modulation is, as follows:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The principle of Duobinary Modulation is, as follows:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[the phase of a symbol is shifted by π, if there is odd number (1, 3, 5...) of binary zeros]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the phase of a symbol is shifted by π, if there is odd number (1, 3, 5...) of binary ones]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the phase of a symbol is shifted by π, if there is even number (2, 4, 6...) of binary zeros]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the phase of a symbol is shifted by π, if there is even number (2, 4, 6...) of binary ones]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The principle of BPSK is, as follows:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The principle of BPSK is, as follows:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[a binary zero is assigned a value of phase that differs by π from a phase assigned to a binary one]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[every binary zero shifts the symbol's phase by π]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[every binary one shifts the symbol's phase by π]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[every binary one shifts the symbol's phase by 180°]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The principle of DPSK is, as follows:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The principle of DPSK is, as follows:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[a binary zero is assigned a value of phase that differs by π from a phase assigned to a binary one]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[every binary zero shifts the symbol's phase by π]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[every binary one shifts the symbol's phase by π]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[every binary one shifts the symbol's phase by 90°]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[In QPSK:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[In QPSK:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[there are two levels of symbol's phase]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[four combinations of two bits are assigned four states of a symbol's phase]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[there are two levels of signal's phase, each combined with two levels of amplitude]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[there are two frequencies, at which two levels of signal's phase are available]]></text>
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<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[In QPSK:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[In QPSK:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[the symbol rate is two times greater than the bit rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the symbol rate is four times greater than the bit rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[the symbol rate is two times slower than the bit rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[the symbol rate is four times slower than the bit rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[PDM-QPSK]]></text>
</name>
<questiontext format="html">
<text><![CDATA[PDM-QPSK]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[halves the amount of possible symbol states using just one polarization component]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[double the amount of possible symbol states using orthogonal polarization component]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[uses phase division multiplexing to increase the bit rate]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[uses polarization division multiplexing to avoid coherent detection]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[PDM-QPSK is a format that is suitable for:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[PDM-QPSK is a format that is suitable for:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[for high reach systems operating at one frequency]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Passive Optical Networks using polarization maintaining fibres only]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[transmission systems with coarse grid]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[high-speed transmission systems with dense grid]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Coexistence of two systems using different modulations in one fibre:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Coexistence of two systems using different modulations in one fibre:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[requires removing a safety band that occupies many channels]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[does not allow channel interleaving]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[can cause crosstalks from amplitude modulation channels to phase modulation channels]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[does not allow combining systems with different bit rates per channel]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Cross Phase Modulation:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Cross Phase Modulation:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[is also known as CPM]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[can originate when interleaving channels with different modulations]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is an amplitude modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is a frequency modulation]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Kerr effect:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Kerr effect:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
<penalty>0.1</penalty>
<hidden>0</hidden>
<shuffleanswers>1</shuffleanswers>
<single>true</single>
<shuffleanswers>true</shuffleanswers>
<correctfeedback>
<text></text>
</correctfeedback>
<partiallycorrectfeedback>
<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="0">
<text><![CDATA[is a change in the frequency of a material in response to an applied electric field]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is a change in the phase of a symbol in response to an applied electric field]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[is a change in the effective index of a material in response to applied force]]></text>
<feedback>
<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[is a change in the refractive index of a material in response to an applied electric field]]></text>
<feedback>
<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[The width of each channel in Orthogonal Frequency Division Multiplexing is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[The width of each channel in Orthogonal Frequency Division Multiplexing is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
</generalfeedback>
<defaultgrade>1</defaultgrade>
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<single>true</single>
<shuffleanswers>true</shuffleanswers>
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<text></text>
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<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
<answernumbering>none</answernumbering>
<answer fraction="100">
<text><![CDATA[Δf = B/N, where B is bandwidth and N is number of subchannels]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Δf = N/B, where B is bandwidth and N is number of subchannels]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Δf = B*N, where B is bandwidth and N is number of subchannels]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Δf = (B+1)/(N-1), where B is bandwidth and N is number of subchannels]]></text>
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<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[VDMT is:]]></text>
</name>
<questiontext format="html">
<text><![CDATA[VDMT is:]]></text>
</questiontext>
<image></image>
<generalfeedback>
<text></text>
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<shuffleanswers>true</shuffleanswers>
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<text></text>
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<text></text>
</partiallycorrectfeedback>
<incorrectfeedback>
<text></text>
</incorrectfeedback>
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<answer fraction="0">
<text><![CDATA[Virtual Digital Multi-Tasking]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="100">
<text><![CDATA[Vectored Discrete Multi-Tone]]></text>
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</answer>
<answer fraction="0">
<text><![CDATA[Vectored Differential Multi-Tone]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[Vectored Digital Multi-Tone]]></text>
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<text></text>
</feedback>
</answer>
</question>

<question type="multichoice">
<name>
<text><![CDATA[Which claim referred to VDMT is right?]]></text>
</name>
<questiontext format="html">
<text><![CDATA[Which claim referred to VDMT is right?]]></text>
</questiontext>
<image></image>
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<text></text>
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<single>true</single>
<shuffleanswers>true</shuffleanswers>
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<text></text>
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<text></text>
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<incorrectfeedback>
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<answer fraction="0">
<text><![CDATA[It does not require synchronization of all DMT symbols]]></text>
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</answer>
<answer fraction="100">
<text><![CDATA[It is a modulation widely used in xDSL technology]]></text>
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</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[It cannot implement QAM modulation in particular sub-channels]]></text>
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<text></text>
</feedback>
</answer>
<answer fraction="0">
<text><![CDATA[It uses a vector containing information about each Differential Multi-Tone symbol]]></text>
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<text></text>
</feedback>
</answer>
</question>


</quiz>

