Generators

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Author:
johnbowens
ID:
124773
Filename:
Generators
Updated:
2012-01-09 21:11:42
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generators NJATC JATC IBEW
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Description:
Generators per AC Theory Text, 2nd Edition, NJATC
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  1. Eventually DC power distribution will be found only in what places? NJATC, AC Theory, PP 256 (NC set: Generators)
    This type of power will be eventually found where extremely high torque per HP is required or where the nature of the work required DC, such as in electrolysis applications.
  2. The left hand rule and right hand rule are used for what type of electron theory respectively? NJATC, AC Theory, (NC set: Generators) PP 13
    • Right-hand rule: conventional flow +to-
    • Left-hand rule: Electron Current Flow -to+ (Flemming's left hand rule for generators; motion, electro-magnetic lines of force, current flow.
  3. As the armarture rotates it begins to cut the maximum lines of flux when? NJATC, AC Theory, (NC set: Generators) PP 259
    This cuts the maximum lines of flux when 90 degrees or perpendicular to the magnetic field.
  4. What is key to determining wether the output voltage of the generator is alternating or direct? NJATC, AC Theory, PP 260 (NC set: Generators)
    The method of removing the voltage from the armature determines this. In AC the armature may or may not be rotating.
  5. The output voltage from the brushes in a generator (DC) will always be what? NJATC, AC Theory, PP 260 (NC set: Generators)
    This output voltage will always be a pulsating DC going form zero voltage to peak voltage but never reversing.
  6. What will allow the voltage to remain positive even though the armature is producing an alternating voltage? NJATC, AC Theory, PP 261 (NC set: Generators)
    The change in commutator segments allows this.
  7. The rotating member of the DC generator is what? NJATC, AC Theory, PP 262 (NC set: Generators)
    Armature, in a DC generator. The method of removing the voltage in the armature is key to determining wether the output voltage of the generator is DC or AC. Consisting of the iron core, commutator, and the windings.
  8. In a DC generator, the armature assembly has how many parts and what are they? NJATC, AC Theory, PP 262 (NC set: Generators)
    • laminated iron core, commutator and windings,
    • coils or windings (3 types), and shaft comprise this.
  9. The armature windings come in three basic types which are? Define which ones have additive current, Additive voltage, and additive current and voltage. NJATC, AC Theory, PP 262 (NC set: Generators)
    • Lap -parallel-Additive I
    • Wave -Series-Additive E
    • Frog-leg -Series parallel-Additive I & E
    • Are three basic types of this?

  10. Which is the most common armature winding configuration? NJATC, AC Theory, PP 263 (NC set: Generators)
    frog-leg = series parallel is this.
  11. The field winding is connected to what type source of power? NJATC, AC Theory, PP 264 (NC set: Generators)
    DC is the type of power source that this is connected to in a generator. Field winding definition: The part of the DC generator that creates the magnetic field that is cut by the armature windings.
  12. There are two types of field windings in a DC generator... what are they? NJATC, AC Theory, PP 264 (NC set: Generators)

    Field windings are marked as what?
    Shunt and series

    • Series marked S1 & S2
    • Parallel marked as F1 & F2
  13. Explain the output voltage to the load current relationship of shunt and series field windings? NJATC, AC Theory, PP 264 (NC set: Generators)
    • Shunt= E output lowers/ I Load raises- inversely proportional
    • Series= E output raises / I Load raises Directly proportional
  14. The series generator stator field winding type must be what? NJATC, AC Theory, PP 265 (NC set: Generators)
    This generator stator field winding wiring type must be self excited, meaning the pole pieces must have some sort of residual magnetism to start producing a voltage in the armature.
  15. Because of the varying voltage, the series generator field winding wiring type is best suited for what type of load? NJATC, AC Theory, PP 266 (NC set: Generators)
    constant loads are best suited for this type of generator field winding type and for this reason.
  16. What does the shunt generator provide before the load is applied? NJATC, AC Theory, PP 266 (NC set: Generators)
    The full voltage is applied before this in a shunt generator.
  17. Define a field winding. NJATC, AC Theory, PP 264 (NC set: Generators)
    The part of the DC generator that creates the magnetic field that is cut by the armature windings.
  18. Define an armature. NJATC, AC Theory, PP 341 (NC set: Generators)
    The component in the process of generation that has voltage induced into it. It is not always the moving component but is the place where generated voltage is collected.
  19. The amount of voltage generated by a series generator is dependent on what? NJATC, AC Theory 2009, PP 265 (NC set: Generators)
    The strength of the magnetic field produced by the pole pieces, turns of wire on the armature, and the speed of rotation of the armature all determine this in a DC generator.
  20. As the load increases on a shunt generator, what happens to the output voltage? NJATC, AC Theory 2009, PP 266 (NC set: Generators)
    The output voltage will decrease in this type generator as the load increases.
  21. Another term for a series variable resistor is what? NJATC, AC Theory 2009, PP 266 (NC set: Generators)
    Rheostat.

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