单项选择题
Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.
A.small wire brush
B.compressed air jet
C.clean dry cloth
D.10% solution carbon solvent and water
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相关考题
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单项选择题
Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.
A.portable growler
B.galvanometer
C.visual inspection
D.megohmmeter -
单项选择题
A generator is prevented from becoming motorized by the use of a/an （）.
A.over-speed trip
B.reverse power relay
C.back pressure trip
D.governor controls -
单项选择题
Which of the electrical properties listed will always be the same for each component in a parallel circuit?（）
A.Impedance
B.Current
C.Resistance
D.Voltage
