单项选择题
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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相关考题
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单项选择题
An ammeter should be used to measure （）
A.the voltage between two points in a circuit
B.circuit continuity
C.current flow in a circuit
D.total or partial circuit resistance -
单项选择题
When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）
A.increases by the square of the original value
B.increases
C.remains the same
D.decreases -
单项选择题
The power factor of an AC generator operating singularly is determined by the （）
A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage
