单项选择题
When two DC generators operate in parallel, they are protected against motorizing by（）
A.blow out coils B.governor relay C.under voltage trips D.reverse current trips
单项选择题 The correct phase rotation of a three-phase alternator can be checked with a（）
单项选择题 A probable cause for a turbo generator tripping out on overspeed is a sudden（）
单项选择题 All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the（）
