修高压电机、高压电机修理、维修高压电机 质量信得过维修有保证（The maintenance of high voltage motor, high voltage motor repair and maintenance of high voltage motor is guaranteed）

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1、修高压电机、高压电机修理、维修高压电机质量信得过维修有保证（Themaintenanceofhighvoltagemotor,highvoltagemotorrepairandmaintenanceofhighvoltagemotorisguaranteed）NANSCE7minus1AwhatistheoperationofAdilutesugarwaterinboilingstateconcentratedinconcentratedsugarwater?(A)evaporation(B)distillation(C)drying(D)absorption.Wh

2、ichofthefollowingoperationsdoesnotbelongtoevaporation?(A)heattheseawaterintoconcentratedbrineandsalt(B)toheatthefreshlysqueezedfruitjuicetoconcentrate(C)toconcentratethedilutefruitwineintospirits(D)toheatthedilutesulfuricaciduntilboiling,torepelwaterandconcentrate.7-3D.Someaqueoussolut

3、ionshaveahighviscosityathighconcentration,sothattheflowrateisslowintheheatingtubeandtheheattransferisbad.Whatkindofevaporatorisitsuitableforthissolution?(A)tubeevaporator(B)longtubeevaporator(C)naturalcirculationevaporator(D)mandatorycirculatingevaporator.7-4A"underanypressure,theboili

4、ngpointoftheconcentratedsolutionisindirectproportiontotheboilingpointofthepurewaterunderthesamepressure."theaboveruleiscalled(A)thelawofthe(B)thelawoftheearcanal(D)tothelysaclaw.7-5Bbelowistheannextotheevaporator,wherethefunctionofwhichistoexcludecondensationwaterandpreventthewatervapo

5、rfromdissipating?(A)thecondenser(B)water-disconnector(C)mistseparator(D)vacuumpump.7-6Bthermalsensitivesolution,tobeconcentratedbyevaporationmethod,whichofthefollowingevaporatorismostsuitable?(A)shorttubeevaporator(B)tubeevaporator(C)mandatorycirculatingevaporator(D)horizontaltubeevapo

6、rator.7-7Aevaporationoperationisusuallycarriedoutundervacuum.Whatisthepurpose?(A)reducetheboilingtemperature,increasetheheattransferrate(B)reducetheviscosityofthesolution,increasetheheattransferrate(C)increasetheboilingtemperature,andincreasetheheattransferrate(D)toreducetheboilingtemp

7、eraturetosavecoolingwater.Whataretheadvantagesof7-8Bmulti-effectevaporation?(A)increasesproduction(B)savesheatingandcoolingwater(C)savesequipment(D)andsavesAvacuum.7-9B3-effectevaporatoroperation,whatisthepressuresizeofeacheffect?(A)firsteffect=secondeffect=thirdeffect(B)firsteffect>