单项选择题

The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.

A.flowmeter
B.viscometer
C.micrometer
D.feeler

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单项选择题

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

单项选择题

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

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

单项选择题

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