【单选题】At which point do you engage the main circuit breaker of the incoming alternator when paralleling two alternators?
A.
With the pointer of the synchronoscope rotating fast and both synchronizing lamps flashing on and off.
B.
In none of the mentioned alternatives.
C.
With the pointer of the synchronoscope at 12 O'clock and both synchronizing lamps dark (off).
D.
With the pointer of the synchronizer stopped at any position and both synchronizing lamps bright (on).
【简答题】常用的几种导出的逻辑运算(复合逻辑运算)为 、 、 、 、 。
【简答题】An email to book a hotel Learn how to write an email to book a hotel to practise and improve your writing skills. 学习如何通过撰写电子邮件来预订酒店,以练习和提高写作技巧。 Part 1: Preparation 第一部分,准备 Before reading, do the prepa...
【单选题】With two alternators operating in parallel at 75% load capacity, one trips without any warning. What is the first action that should be taken?
A.
Start and connect the emergency alternator.
B.
Check the circuit breaker of the tripped alternator.
C.
Restart the tripped alternator immediately.
D.
Trip/stop all nonessential loads that are connected to the switchboard.
【单选题】(真题2018-U1-77)患儿,6个月。腹泻3天,稀便每日2次左右,出现如图所示表现,其脱水程度是
【单选题】Which of the following statements is true concerning the operation of two alternators in parallel?
A.
The cycles per second of each alternator are the same.
B.
Both alternator governors must be set with the same amount of speed droop.
C.
The number of field poles must be the same on each alternator.
D.
The load must always be divided equally between alternators.
【单选题】With two alternators running in parallel, you wish to stop one. The first step is to _______.
A.
make sure the load is evenly shared
B.
trip the main circuit breaker
C.
increase the frequency on the switchboard
D.
remove the load from the alternator to be stopped
【单选题】With two alternators running in parallel, you wish to stop one. The first step is to ____.
A.
Make sure the load is evenly shared
B.
Trip the main circuit breaker
C.
Increase the frequency on the switchboard
D.
Remove the load from the alternator to be stopped
【单选题】At which point do you engage the main circuit breaker of the incoming alternator when paralleling two alternators?
A.
With the pointer of the synchronoscope rotating fast and both synchronizing lamps flashing on and off
B.
With the pointer of the synchronoscope stopped at any position and both synchronizing lamps bright(on)
C.
With the pointer of the synchronoscope at 12 o’clock and both synchronizing lamps dark (off )
D.
None of the other alternatives