你可能感興趣的試題

The purpose of DC generator brushes is to （）.

A.neutralize armature reaction
B.conduct electric current to an outside circuit
C.convert DC current to AC current
D.provide excitation to a DC generator

單項選擇題

Which of the listed precautions should be taken when cleaning the internals of a motor with compressed air?（）

A.Open the machine on both ends so as to allow the air and dust to escape
B.Be certain that the circuit breaker is opened and tagged on the feeder panel
C.Be certain that the air is clean and as dry as possible
D.All of the above