單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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