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【多选题】
油压实验 所有挡位的主油路油压均太低说明( ) 。A.
油泵故障；
B.
主油路调压阀卡死；
C.
主油路泄漏；
D.
主油路调压阀弹簧太软；
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举一反三
【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 frequency
B.
the same as the line frequency
C.
slightly greater than the line frequency
D.
All of the above
【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 frequency
B.
the same as the line frequency
C.
slightly greater than the line frequency
D.
have nothing to do with the line frequency
【单选题】When paralleling two AC generators, the frequency of the machine coming on-line,imediately prior to closing its breaker, should be____.
A.
slightly less than the oncoming generator frequency
B.
slightly greater than the bus frequency
C.
the same as the bus frequency
D.
the same as the bus voltage
【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 ______. prefix="o" ns="urn:schemas-microsoft-com:office:offic...
A.
have nothing to do with the line frequency
B.
slightly greater than the line frequency prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
the same as the line frequency
D.
slightly less than the line frequency prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
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