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单选题
The division of kilowatt load between two paralleled alternators is determined by the （）
A
amount of field excitation of the leading machine
B
load-speed characteristics of the governors
C
amount of field excitation to the lagging machine
D
type of alternator
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单选题When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.A
pick up more of any increase in loadB
pick up less of any increase in loadC
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单选题Why is it desirable to operate paralleled AC generators at the same power factor?（）A
Circulating currents are kept to a minimumB
Field excitation losses are kept to a minimumC
Generator rotors will have a lesser tendency to huntD
Because a power factor increase will decrease kilowatt output
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PowerC
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an incorrect diesel generator governor speed droop adjustmentB
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unsynchronized isochronous load distribution adjustmentsD
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nothing，BGP automatically load-balances the traffic between different autonomous systems on all available linksB
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多选题Which two statements are true about optical networks?（）ASONET and SDH both use time-division multiplexing.BAn optical transport network system uses time-division multiplexing.CSONET and SDH both use wavelength-division multiplexing.DAn optical transport network system uses wavelength-division multiplexing.
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单选题Which is the winter load waterline on the load waterline mark?（）.A
The line over the summer load waterlineB
The line above the tropical load waterlineC
The line below the tropical load waterlineD
The line between the summer and the winter north Atlantic load waterline
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