單項選擇題

When the current in a power transmission line is increased, the power loss （）

A.increases as the square of the current
B.decreases as the square root of the current
C.remains the same, as it is independent of current flow
D.increases in direct proportion as the current

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單項選擇題

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

A.1 volt, the output changes 5 volts
B.5 volts, the output changes 1 volt
C.5 volts, the output changes 10 volts
D.10 volts, the output changes 5 volts

單項選擇題

Why is it desirable to operate paralleled AC generators at the same power factor?（）

A.Circulating currents are kept to a minimum
B.Field excitation losses are kept to a minimum
C.Generator rotors will have a lesser tendency to hunt
D.Because a power factor increase will decrease kilowatt output

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When the current in a power transmission line is increased, the power loss （）

你可能感興趣的試題

An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）

Why is it desirable to operate paralleled AC generators at the same power factor?（）