A.waterproof
B.drip proof
C.spray tight
D.spray proof
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A.portable tools
B.large pump motors
C.turbo electric main motors
D.forced draft fans
A.5 volts, the output changes 10 volts
B.10 volts, the output changes 5 volts
C.2 volts, the output changes 10 volts
D.10 volts, the output changes 2 volts
A.penetration of moisture
B.accumulation of dirt
C.overheating
D.All of the above
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
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