题目内容

A circuit breaker differs from a fuse in that a circuit breaker ______.

A. melts and must be replaced
B. is enclosed in a tube of insulating material with metal ferrules(环) at each end
C. gives no visual indication of having opened the circuit
D. trips to break the circuit and may be reset

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The load sharing characteristics of two diesel generators operating in parallel are mostly

A. load limit settings
B. idle speed settings
C. speed limit settings
D. speed droop settings

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As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will ______.

A. increase
B. decrease
C. remain unchanged
D. be greatest at dew point

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If both the ‘high level’and ‘low level’ alarms come on for the same address of a centralized（集中的） control console, the most likely problem is a/an ______.

A. sensor failure
B. failed alarm
C. low level
D. extremely high level

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You are attempting to parallel two AC generators, and the synchroscope(同步器) pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is ______.

A. higher than the bus frequency
B. lower than the bus frequency
C. the same as the bus frequency but out of phase with it
D. the same as the bus frequency and the circuit breaker may be closed at any pointer position

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A circuit breaker differs from a fuse in that a circuit breaker ______.

A. melts and must be replaced B. is enclosed in a tube of insulating material with metal ferrules(环) at each end C. gives no visual indication of having opened the circuit D. trips to break the circuit and may be reset

The load sharing characteristics of two diesel generators operating in parallel are mostly

As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will ______.

If both the ‘high level’and ‘low level’ alarms come on for the same address of a centralized（集中的） control console, the most likely problem is a/an ______.

You are attempting to parallel two AC generators, and the synchroscope(同步器) pointer is revolving in the fast direction. This indicates that the frequency of the incoming machine is ______.

A. melts and must be replaced
B. is enclosed in a tube of insulating material with metal ferrules(环) at each end
C. gives no visual indication of having opened the circuit
D. trips to break the circuit and may be reset