rotor
stator
exciter
armature
第1题：
A、controversial
B、collaborative
C、intangible
D、intrusive
第2题：
In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .
A.The generator need not excitation.
B.The winding on the rotor is for inputting excitation current.
C.There are three phase windings on the rotor.
D.The generator has no brushes.
第3题：
Which of the units listed is used to combust waste in the engine room?
A.Boiler
B.Incinerator
C.Generator
第4题：
A work order has been created to perform corrective maintenance on a defective generator. All required information has been provided in the work order， but required materials are not in stock and have to be ordered. What is the status of the work order， after a maintenance manager has approved the work order？ （）
第5题：
材料：
The field current supply in older machines comes from a lower voltage direct current generator or exciter on the same shaft as the alternator. Modern machines however are either statically excited or of the high-speed brush-less type. The exciter is required to operate to counter the effects of power factor for a given load. The power factor is a measure of the phase difference between voltage and current and is expressed as the cosine of the phase angle. With a purely resistance load the voltage and the current are in phase, giving a power factor of one. The power consumed is therefore the product of voltage and current. Inductive or capacitive loads, combined with resistance loads, produce lagging or leading power factors which have a value less than one.
The power consumed is therefore the product of current, voltage and power factor. The alternating current generator supplying a load has a voltage drop resulting from the load. When the load has a lagging power factor this voltage drop is considerable. Therefore the exciter, in maintaining the alternator voltage, must vary with load current and also the power factor. The speed change of the prime mover must also be taken into account.
问题： The word “machines” in the passage refers to _____.
A.the direct current generator
B.the alternating current generator
C.the exciter
D.the prime mover
Which of the following statements is true according to the passage ?
A.With a purely resistance load, the power factor is zero
B.Inductive loads combined with resistance loads produces leading power factors
C.Capacitive loads combined with resistance loads produces lagging power factors
D.With a purely resistance load, the phase angle is zero
When the load has a lagging power factor this voltage drop is considerable. This sentence means that _____.A.with a purely resistance load, the voltage drops too much
B.there is a considerable voltage drop in the capacitive load combined with resistance load
C.when the load is the capacitive load combined with resistance load, the voltage drops to zero
D.when the load is the inductive load combined with resistance load, the voltage drop is fairly large
The exciter must vary with: ① load current ② the power factor, ③ speed change of the prime mover.A.①
B.②
C.①②
D.①②③
请帮忙给出每个问题的正确答案和分析，谢谢！
第6题：
Use direct order in presentation when you expect the audience to be ( )
A.skeptical
B.unreceptive
C.receptive
第7题：
Which of the following components are used to convert alternating current produced in the generator windings to direct current?
A.Armature and equalizer
B.Commutator and brushes
C.Rotor and interpoles
D.Field and exciter
第8题：
We()your terms satisfactory and now send you our order for 2 sets of the generator .
A. find
B. believe
C. think
D. suppose
第9题：
A technician suspects the AC voltage into a PC power supply is bad. Which of the following toolswould MOST likely be used to confirm the diagnosis?（）
第10题：
A customer plans to order several new pSeries systems and is concerned that the additional heat load may overwhelm the current air-handling system. How might the pSeries technical specialist aid the customer in addressing their concern？（）