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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 load
B
pick up less of any increase in load
C
share an equal amount of any increase in load
D
drop an equal amount of any decrease in load
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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.share an equal amount of any increase in loadD.drop an equal amount of any decrease in load
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The division of kilowatt load between two paralleled alternators is determined by theA.amount of field excitation of the leading machineB.load-speed characteristics of the governorsC.amount of field excitation to the lagging machineD.type of alternator
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Equal power factors on paralleled AC generators are maintained by an automatic ________.A.governor control switchB.reverse power relayC.reverse current relayD.voltage regulator
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考题
单选题The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the （）.A
voltage regulatorsB
field rheostatsC
reverse power relaysD
prime mover governors
考题
单选题Which is a function of the voltage regulators used with AC generators?（）A
To cut out generators when they are no longer requiredB
To cut in additional generators automatically as requiredC
To divide the KW load equally between generators operating in parallelD
To divide reactive current between generators operating in parallel
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单选题The load between two steam-driven alternators operating in parallel may be adjusted by varying （）A
the speed of the alternatorsB
the field strength of the machinesC
the power factor of the alternatorsD
steam supply to the prime movers
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单选题A diesel driven emergency generator is prevented from being paralleled with the ships service generators by （）A
an electrical interlock systemB
an automatic paralleling trip switchC
the synchronizing oscilloscopeD
the reverse current relay
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单选题While paralleling two AC generators using synchronizing lamps only, both lamps will go dark when the generators are （）.A
running at the same speedB
groundedC
of the same polarityD
in phase
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单选题Starting motors，generators，and other spark producing devices should be mounted as high above the bilges as possible to（）.A
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单选题Equal power factors on paralleled AC generators are maintained by an automatic （）.A
voltage regulatorB
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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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单选题Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）A
SensitivityB
PowerC
Speed droopD
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考题
单选题When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the （）A
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fast direction, just after the 12 o'clock positionC
fast direction, just before the 12 o'clock positionD
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考题
单选题When paralleled, AC generators must have the same （）A
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单选题When two DC generators operate in parallel, they are protected against motorizing by（）A
blow out coilsB
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单选题If two AC generators are to be operated in parallel, the load is distributed evenly by（）A
means of rheostat the governor settingsB
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单选题If two AC generators are operated in parallel, the load is distributed evenly by（）A
a rheostatB
a balancing coilC
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adjusting the governor settings
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单选题Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）A
slightly less than the line frequencyB
the same as the line frequencyC
slightly greater than the line frequencyD
All of the above
考题
单选题When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be （）A
slightly less than the oncoming generator frequencyB
the same as the bus frequencyC
slightly greater than the bus frequencyD
the same as the bus voltage
考题
单选题The division of kilowatt load between two paralleled alternators is determined by the （）A
amount of field excitation of the leading machineB
load-speed characteristics of the governorsC
amount of field excitation to the lagging machineD
type of alternator
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