电工电子专业英语 教学课件 作者 徐红梅 Unit13,14.pptx

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1、ExercisesⅠ.Answerthefollowingquestions.1.Whatistheoscilloscope?2.Whereisitused?3.Whatdoesthecathode-raytubeconsistof?4.Whatistheheartoftheoscilloscope?5.Whatdoestheelectrongunconsistof?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,ifnot,say“False”.1.Anoscilloscopei

2、smoreusefulthanamultimeter.2.Theoscilloscopeisalsocalledacathode-rayoscilloscope.3.Therearetwotypesofoscilloscopes:analogoscilloscopeanddigitaloscilloscope.4.Theoscilloscopecannotbeusedindesigningwork.5.Theoscilloscopecanbeusedtomeasurecurrent.3.Theelectrongunconsistsofacathode,acontrolgrid,

3、ananodeandtwosetsofdeflec-tionplates.4.Onesetofdeflectionplatesisusedformovingtheelectronbeaminhorizontaldirec-tion.5.Theothersetisusedformovingtheelectronbeaminverticaldirection.Ⅲ.TranslatethefollowingsentencesintoChinese.1.Theoscilloscopeisalsocalledacathode-rayoscilloscopewhichisoneofthem

4、ostimportanttestandmeasuringinstruments.2.Theheartoftheoscilloscopeisthecathode-raytubewhichconsistsofthebase,neck(inwhichanelectrongunisincluded),bulbandtheface-plate(screen).ExercisesⅠ.Answerthefollowingquestions.1.Howmanytypesofmotorscanbedividedaccordingtotheconstructionandthetypeofpower

5、supply?2.UniversalmotorscanbeoperatedonDCpoweronly,can’tthey?3.Whataretheuniversalmotorsusedtooperate?4.ForwhatpurposeareDCmotorsused?5.Whattypeofmotorsarewidelyusedinlaboratoriesandfactories?Ⅱ.Arethefollowingstatementscorrect?Ifthesentenceiscorrect,say“True”aloud,ifnot,say“False”.1.Electric

6、motorsmaybedividedintotwogroupsaccordingtotheirconstructionandtypeofpowerused.2.Universalmotorsareusuallylessthan1/25horsepower.3.TheACsquirrelcageinductionmotorismostwidelyused.4.Weuseuniversalmotorsinlaboratoriesandfactories.5.Universalmotorsareusedtooperatesmallappliancesandhandtools.Ⅲ.Tr

7、anslatethefollowingsentencesintoChinese.1.UniversalmotorscanbeoperatedoneitherACorDCpower.2.Universalmotorsareusuallylessthan1/25horsepower.3.DCmotorsareusuallyfoundinalargenumberofindustrialapplicationswherethereisaneedtocontrolspeed.4.TheACsquirr