單項選擇題

A ground in an electrical circuit outside the engine room （）.

A.cannot be detected tinder normal conditions
B.is of no consequence to engineering personnel
C.is indicated at the branch circuit breaker panel
D.is indicated by the ground detecting lamps on the main switchboard

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單項選擇題

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

單項選擇題

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

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A ground in an electrical circuit outside the engine room （）.

你可能感興趣的試題

Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an （）.

Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.

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