①Dimension of tooth top surface should be equal to or more than the pole piece diameter.
②Tooth height should be equal to, or more than the space between teeth.
③The space between teeth should be approximately three times the pole piece diameter.
④Air gap (clearance) between tooth and pole piece should be between 0.015" to 0.030". MPUs
normally have 3/8", 5/8" threads and 2", 3" and 4" lengths. Determining which size is appropriate
depends on the space available for installation, the availability of pre-drilled holes and consideration to
those rules mentioned above. In most cases, these will be the only factors affecting the selcetion of a
MPU.
MPUs can be used to ____.①sense speed ②supply alarm ③sense direction of rotation.
A.①②
B.②③
C.①③
D.①②③
[单选题]第二组的组距是( )。A.75B.60C.50D.45
[单选题]第二组数据主要表明( )。A.项目申请已经成为科研人员最为关注、最为头痛的事情了B.课题申请难度大,竞争激烈C.以人际关系为主导因素的“小圈子”,背离了公平竞争原则D.经费投人力度不能满足科研的需要
[单选题]第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressiv
[单选题]()是组对的第二要素。A . 支撑B . 定位C . 夹紧D . 不确定
[单选题]第二组D.isplacement pumps are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid out into the delivery pipe. Centrifugal pumps are those wherein an impel
[单选题]第二组Under normal operation, some lubrication oil mist may be discharged from the air compressor to the air start system. This oil may be from excess compressor cylinder lubrication, from faulty oil scraper rings, or may even be suspended oil vapor con
[单选题]A. magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles ofA.waterB.babbittC.iron or steelD.acids
[单选题]The magnetic field is provided by electromagnets so arranged that adjacent poles have ___.A.opposite polarityB.the same polarityC.negative polarityD.positive polarity
[单选题]A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of().A . waterB . babbittC . iron or steelD . acid