A.prevent the windings from becoming brittle
B.prevent moisture from condensing in the windings during shutdown
C.prevent acidic pitting of the slip rings
D.keep the lube oil warm for quick starting
您可能感興趣的試卷
你可能感興趣的試題
A.generate its own electrical power
B.transform electrical energy into mechanical energy
C.increase or decrease circuit voltage as required
D.convert AC current to DC current
A.Glass
B.Bakelite
C.Soft iron
D.Aluminum
A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power
A.droop
B.drop
C.dip
D.regulation
A.sensor failure
B.failed alarm
C.low level
D.extremely high level
最新試題
Diesel engine air start system check valves are opened by （）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
The cetane rating of diesel fuel is an indication of the （）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
Which of the following items don’t belong to dock repair works?（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
The main purpose of port State control is not to（）