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單項(xiàng)選擇題

All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the（）

A.temperature rise
B.input kilowatts
C.horsepower
D.operating voltage

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單項(xiàng)選擇題

When would you ground an electric hand tool?（）

A.When it is a DC machine
B.When it is an AC machine
C.Any machine that operates on over 100 volts
D.Only when working on wet steel plates

單項(xiàng)選擇題

The load between two steam-driven alternators operating in parallel may be adjusted by varying （）

A.the speed of the alternators
B.the field strength of the machines
C.the power factor of the alternators
D.steam supply to the prime movers

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