單項選擇題

Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.

A.reduce electrolytic action on heat exchanger metals
B.keep heat transfer surfaces shiny and clean
C.prevent rapid accumulation of marine growth
D.provide a protective coating on heat exchanger surfaces

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單項選擇題

With a （） load the voltage and current are in phase.

A.pure resistance
B.capacitive
C.inductive
D.None of the above

單項選擇題

The star-delta starter is an effective method of （） voltage starting of a motor.

A.increased
B.reduced
C.unchanged
D.None of the above

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Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.

你可能感興趣的試題

With a （） load the voltage and current are in phase.

The star-delta starter is an effective method of （） voltage starting of a motor.