A.normal operation
B.a dirty commutator
C.increased brush capacity
D.water vapor absorption
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A.high mica condition
B.low ambient temperature
C.clogged ventilation ducts
D.an open in the shunt field
A.ampere
B.volt
C.watt
D.ohm
Some large A-Cmotors are equipped with heatersThese could be （）
(1)resistance heaters bolted directly to the frame
(2)low voltage windings embedded in the motor windings
A.(1) only
B.(2) only
C.either (1) or (2)
D.neither (1) or (2)
In order to change the direction of rotation of a D-Cmotor （）
(1) the field leads must be changed
(2) the input leads must be changed
A.（1）only
B.（2）only
C.either（1）or（2）
D.neither（1）or（2）
If a small electric motor is immersed in salt water it should be （）
(1) washed in fresh water
(2) dried in an oven
A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) or (2)
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
The shipboard oil pollution emergency plan will be invalid after （）
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（） is not installed on the main switchboar.
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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