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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（） is not installed on the main switchboar.
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
The shipboard oil pollution emergency plan will be invalid after （）
Which of the following items don’t belong to dock repair works?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
If separating effect is not good, which measure should be taken （）