A.penetration of moisture
B.accumulation of dirt
C.overheating
D.All of the above
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A.90~0 kw
B.127~27 kw
C.155~70 kw
D.194~85 kw
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)
最新試題
Which of the following items don’t belong to dock repair works?（）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）
The condensers located in various stages of a flash evaporator are cooled by（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
The ISPS Code consists of a mandatory section-Part A, which shows（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
The main purpose of port State control is not to（）
Cold weather starting of a diesel engine may be made easier by（）
Using a file without a handle may result in （）
（） is not installed on the main switchboar.