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The output voltage of a 440 volt, 60 hertz, AC generator is controlled by the ______.

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It consumes no excitation power  It has current transformers  Components are needed for accurate compounding  Its excitation system is vulnerable to voltage variations  
instantaneous voltage  average voltage  RMS voltage  peak voltage  
110V  440V  660V  127V  
droop  drop  dip  regulation  
the recommended current and voltage rating  higher current and voltage rating  higher current and lower voltage rating  lower current and higher voltage rating  
relative speed of the rotor poles  number of turns of wire in the armature coil  strength of the magnets used  output voltage  
单相AC440V  三相AC440V  50Hz  60Hz  
Current and voltage may be in phase  Current may lead the voltage  Current may lag the voltage  All of the above  
AC voltage to the armature  AC voltage to the field  DC voltage to the armature  DC voltage to the field  
Low voltage protection circuit  Non-renewable link fuse  Renewable link fuse  Low voltage release circuit  
number of turns of wire in the armature coil  number of magnetic poles  strength of the magnets used  output voltage  
number of turns of wire in the armature coil  number of magnetic poles  strength of the magnets used  output voltage  
110V、220V、380V、440V  220V、380V、440V、480V  380V、415V、440V、480V  220V、380V、440V、460V  
220V、300A  440V、250A  220V、500A  440V、600A  
prime mover governor  exciter generator  voltage regulator  reverse power relay  
varying the D.Cexciter voltage  varying the reluctance of the air gap  regulating the speed of the prime mover  shorting out part of the armature windings  
220V  311V  380V  440V  

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