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问答题
什么是 device breakdown voltage？
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WhichstatementsistrueaboutForeignExchangeStation(FXS)portsonarouter?()
A.theFXSinterfaceallowsananalogconnectiontobedirectedatthepublicswitchedtelephonenetwork（PSTN’s）centralofficeB.theFXSinterfaceconnectdirectlytoastandardtelephone，faxmachine，orsililardeviceandsuppliesring，voltage，anddialtoneC.theFXSinterfaceconnectdirectlytoanIPphoneandsuppliesring，voltage，anddialtoneD.theFXSinterfaceconnectdirectlytoISDNvoicechannels
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Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A、the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB、the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC、the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD、the FXS interface connect directly to ISDN voice channels
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Which of the following is the voltage that an ATX molex connector delivers to an IDE device？ （）A、-3.3 VoltsB、24 VoltsC、120 VoltsD、12 VoltsE、5 Volts
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Which statement is true about Foreign Exchange Station （FXS） ports on a router？（）A、The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B、The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C、The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D、The FXS interface connects directly to ISDN voice channels.
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According to Ohm’s Law， which of the following is correct？（）A、As voltage increases， resistance decreasesB、As amperage decreases， resistance decreasesC、As resistance decreases， amperage increasesD、As resistance increases， voltage increases
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单选题The output voltage of a three-phase alternator is regulated by the （）.A
AC voltage to the armatureB
AC voltage to the fieldC
DC voltage to the armatureD
DC voltage to the field
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单选题If a technician suspects that the voltage being delivered to a desktop computer’s power supply is insufficient or incorrect, which device should be used to determine the correct voltage?（）A
A power supply testerB
A multimeterC
A loopback adapterD
A cable tester
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单选题Which of the listed items will stop a motor due to a reduction in voltage and restart it when the voltage is restored to normal?（）A
Low voltage protection circuitB
Non-renewable link fuseC
Renewable link fuseD
Low voltage release circuit
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单选题The instantaneous reduction in voltage of an AC generator, resulting from an increase in load, and prior to the automatic voltage regulator correcting the situation, is called voltage （）.A
droopB
dropC
dipD
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多选题Which of the following is the voltage that an ATX molex connector delivers to an IDE device？ （）A-3.3 VoltsB24 VoltsC120 VoltsD12 VoltsE5 Volts
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单选题Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the （）A
manual positionB
bus neutral positionC
raise voltage positionD
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单选题Which statements is true about Foreign Exchange Station （FXS） ports on a router？（）A
the FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central officeB
the FXS interface connect directly to a standard telephone， fax machine， or sililar device and supplies ring， voltage， and dial toneC
the FXS interface connect directly to an IP phone and supplies ring， voltage， and dial toneD
the FXS interface connect directly to ISDN voice channels
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单选题The alternating current generator supplying a load has a voltage drop resulted from the loadWhen the load has a lagging power factor this voltage drop （）.A
is smallB
may be neglectedC
is usefulD
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the recommended current and voltage ratingB
higher current and voltage ratingC
higher current and lower voltage ratingD
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The FXS interface allows an analog connection to be directed at the public switched telephone network （PSTN’s） central office.B
The FXS interface connects directly to a standard telephone，fax machine，or similar device and supplies ring，voltage，and dial tone.C
The FXS interface connects directly to an IP phone and supplies ring，voltage，and dial tone.D
The FXS interface connects directly to ISDN voice channels.
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单选题The voltage developed by an AC generator is controlled by varying the （）A
speed of the prime moverB
AC excitation to the fieldC
DC excitation to the fieldD
DC excitation of the voltage regulator
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问答题GDI是Graphics Device Interface的首字母缩写，中文可译为什么？
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