网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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 settings
B
a balance coil excitation
C
adjusting the governor settings
D
changing excitation
参考答案
参考解析
解析：
暂无解析
更多 “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 a balance coil excitationC adjusting the governor settingsD changing excitation” 相关考题
考题
( ) can provide an asynchronous link between two ac electric power system with different nominal frequencies.
A.The HVDC (high voltage DC) transmissionB.The EHV (extra-high voltage) AC transmissionC.The AC distributionD.Generators
考题
You are attempting to parallel two AC.generators, and the synchroscope pointer revolving in the fast direction.This indicates that the frequency of the incoming machine is
A.higher than the bus equencyB.lower than the bus equencyC.the same as the bus frequency but out of phase with itD.same as the bus frequency and the circuit breaker may be closed at
考题
You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow direction. This indicates that the frequency of the incoming machine isA.higher than the bus frequencyB.lower than the bus frequencyC.file same as file bus frequency but out of phase with itD.the same as the bus frequency, and the circuit breaker may be closed at nay pointer position
考题
Equal power factors on paralleled AC generators are maintained by an automatic ________.A.governor control switchB.reverse power relayC.reverse current relayD.voltage regulator
考题
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
考题
The load sharing characteristics of two diesel generators operating in parallel are mostly dependent on their governor ______.A.load limit settingsB.idle speed settingsC.speed limit settingsD.speed droop settings
考题
Tensile stress is a result of two forces acting in ______.A.opposite directions on the same line，tending to pull the material apartB.opposite directions on the same line，tending to compress the objectC.opposite directions along parallel linesD.the same direction along parallel lines
考题
Which data synchronization options between two geographical locations are supported by PowerHA SystemMirror?（）A、Parallel and SerialB、Serial and AsynchronousC、Parallel and SynchronousD、Synchronous and Asynchronous
考题
单选题Voltage generated by most AC generators is fed from the machine to the bus by means of（）.A
brushes on a commutatorB
brushes on slip ringsC
slip rings on a commutatorD
direct connections from the stator
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
考题
单选题Tensile stress is a result of two forces acting in（）.A
opposite directions on the same line，tending to pull the material apartB
opposite directions on the same line，tending to compress the objectC
opposite directions along parallel linesD
the same direction along parallel lines
考题
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
考题
单选题In （） technology, two separate and complete processing units run in parallel on a Single chip.A
Hyper-threadingB
CachingC
Multi-taskingD
Dual-core
考题
单选题The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.A
difference in longitudeB
mid-longitudeC
departureD
meridian angle
考题
单选题Equal power factors on paralleled AC generators are maintained by an automatic （）.A
voltage regulatorB
reverse power relayC
reverse current relayD
governor control switch
考题
单选题On commonly used ships,if two A√Cgenerators are operated in parallel, the load is distributed evenly by （）.A
varying the D-Cexciter voltageB
varying the reluctance of the air gapC
regulating the speed of prime moverD
shorting out part of the armature windings
考题
单选题The result of two forces acting in opposite directions and along parallel lines，is an example of what type of stress?（）A
TensileB
CompressionC
ShearD
Strain
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
slow direction, just before the 12 o'clock positionB
fast direction, just after the 12 o'clock positionC
fast direction, just before the 12 o'clock positionD
slow direction, just after the 12 o'clock position
考题
单选题When paralleled, AC generators must have the same （）A
frequencyB
number of phasesC
phase rotationD
All of the above
考题
单选题When two DC generators operate in parallel, they are protected against motorizing by（）A
blow out coilsB
governor relayC
under voltage tripsD
reverse current trips
考题
单选题You are attempting to parallel two AC generators, and the syncope pointer is revolving in the fast directionThis indicates that the frequency of the incoming machine is （）.A
higher than the bus frequencyB
lower than the bus frequencyC
the same as the bus frequency but out of phase with itD
the same as the bus frequency and the circuit breaker may be closed at any pointer position
考题
单选题If two AC generators are operated in parallel, the load is distributed evenly by（）A
a rheostatB
a balancing coilC
changing field excitationD
adjusting the governor settings
考题
单选题If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）A
means of rheostat the governor settingsB
a balance coil excitationC
adjusting the governor settingsD
changing excitation
考题
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
热门标签
最新试卷
