A.90~0 kw
B.127~27 kw
C.155~70 kw
D.194~85 kw
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A.normal operation
B.a dirty commutator
C.increased brush capacity
D.water vapor absorption
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）
最新試題
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
（） is not installed on the main switchboar.
Under MARPOL Code the ship to which it applies has to carry （）
The ISPS Code consists of a mandatory section-Part A, which shows（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The cetane rating of diesel fuel is an indication of the （）
For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）
The shipboard oil pollution emergency plan will be invalid after （）