Which of the motors for the devices li

1、Which of the listed devices could be u

Which of the listed devices could be used as a substitute for a ring grooving tool?（）ASteel brushBFine emery cloth or steel woolCA section of the removed compression ringDA case hardened scraper

2、Which of the listed devices is used to

Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）ATransducerBReducerCTransformerDRectifier

3、Which of the following devices are pro

Which of the following devices are protected from being motorized by a reverse-power relay?（）AAlternatorsBWave guidesCExcitersDAmplidyne

4、Which of the listed devices could be u

Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?（）ASteel brushBFine emery cloth or steel woolCA section of the removed compression ringDA case hardened scraper

5、Which of the following electric motors

Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）ASealed motorsBDrip proof motorsCEnclosed motorsDWatertight motor

6、Which of the following devices is a co

Which of the following devices is a common basic element with nearly all mechanical governors?（）APower pistonBControl rackCWeights acted on by centrifugal forceDIsochronous droop spring