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)
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