A.low voltage battery
B.motor attenuator set
C.DC exciter generator
D.AC supply
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A.replace all bearings regardless of length of service
B.apply a heavy coat of oil to all mating surfaces
C.clean any corroded surfaces and file all burrs smooth
D.coat all parts with alemite grease
A.Peak value
B.Root-mean-square value
C.Average value
D.Maximum value
A.time-delay protection
B.short-circuit protection
C.short duration surge protection
D.sustained overload protection
A.a magnetic operating coil
B.normally open line contacts
C.thermal-overload protection
D.a momentary-contact start button
A.60
B.120
C.180
D.360
最新試題
Which of the following items don’t belong to dock repair works?（）
The condensers located in various stages of a flash evaporator are cooled by（）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
If separating effect is not good, which measure should be taken （）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
The ISPS Code consists of a mandatory section-Part A, which shows（）