A.open circuit
B.short circuit
C.polarized ground
D.ground reference point
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A.Contactors control current and relays control voltage
B.A relay is series connected and a contactor is parallel connected
C.Contactors can handle heavier loads than relays
D.Contactors are made from silver and relays are made from copper
A.short proof
B.ground proof
C.explosion proof
D.overload proof
A.prime mover speed
B.exciter output voltage
C.load on the alternator
D.number of poles
A.shunt field
B.circuit breaker
C.metal framework
D.inter-pole
A.brushes
B.slip rings
C.commutators
D.all of the above
最新試題
The shipboard oil pollution emergency plan will be invalid after （）
Cold weather starting of a diesel engine may be made easier by（）
Diesel engine air start system check valves are opened by （）
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
The condensers located in various stages of a flash evaporator are cooled by（）
Which of the following items don’t belong to dock repair works?（）
（） is not installed on the main switchboar.
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
The main purpose of port State control is not to（）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）