Types of Compound DC Motors
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Questions and Answers

What is the armature resistance of the generator given a line current of 38 A and an Ea value of 217.2 V?

  • 0.2 Ω
  • 0.6 Ω
  • 0.8 Ω
  • 0.4 Ω (correct)

    • What is the no-load speed of the generator if the no-load current is 1 A and the induced voltage is 239.6 V?

  • 27,800 rpm
  • 25,151 rpm (correct)
  • 20,000 rpm
  • 23,500 rpm

    • In a DC generator, what represents the induced voltage in the rotor coils when the generator rotates?

  • Resistor
  • Voltage source (correct)
  • Current source
  • Capacitor

    • What induces the pole flux in a DC generator?

    <p>DC excitation/field current</p> Signup and view all the answers

    In a DC generator, what does the field circuit consist of?

    <p>Resistance and a source</p> Signup and view all the answers

    Which type of DC generator has the equation E_a = Vt + I_a Ra?

    <p>DC shunt generator</p> Signup and view all the answers

    What is the equivalent circuit equation for a DC generator?

    <p>Va = Vt - Ia(Ra + Rf)</p> Signup and view all the answers

    What type of generator has the equation vt = If Rf and Ia = Il + If?

    <p>DC series generator</p> Signup and view all the answers

    What is the value of induced voltage if the line current is 38 A and armature resistance is 0.6 Ω?

    <p>239.6 V</p> Signup and view all the answers

    What happens to the speed of a DC generator when the field current increases significantly?

    <p>Speed increases</p> Signup and view all the answers

    What is the armature resistance of the DC generator if the generated voltage Ea is 217.2 V and the line current is 38 A?

    <p>1.2 Ω</p> Signup and view all the answers

    In a DC generator, what does the field voltage Vf represent?

    <p>Field circuit current</p> Signup and view all the answers

    What is the significance of the pole flux in a DC generator?

    <p>Induces voltage in the armature coils</p> Signup and view all the answers

    Which type of DC generator has the equation Ea = Vt + IaRa and vt = IfRf?

    <p>DC shunt generator</p> Signup and view all the answers

    What is the role of the DC excitation/field current in a generator?

    <p>Produces the pole flux</p> Signup and view all the answers

    If the no-load voltage of a DC generator is 239.6 V with a no-load current of 1 A, what is the no-load speed?

    <p>25,000 rpm</p> Signup and view all the answers

    What could be the effect on generated voltage if there is a significant increase in armature resistance in a DC generator?

    <p>Generated voltage decreases</p> Signup and view all the answers

    When operating at no load, what is typically observed about the speed of a DC generator compared to when it is loaded?

    <p>No-load speed is lower than loaded speed</p> Signup and view all the answers

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