18 Questions
What is the armature resistance of the generator given a line current of 38 A and an Ea value of 217.2 V?
0.4 Ω
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?
25,151 rpm
In a DC generator, what represents the induced voltage in the rotor coils when the generator rotates?
Voltage source
What induces the pole flux in a DC generator?
DC excitation/field current
In a DC generator, what does the field circuit consist of?
Resistance and a source
Which type of DC generator has the equation E_a = Vt + I_a Ra?
DC shunt generator
What is the equivalent circuit equation for a DC generator?
Va = Vt - Ia(Ra + Rf)
What type of generator has the equation vt = If Rf and Ia = Il + If?
DC series generator
What is the value of induced voltage if the line current is 38 A and armature resistance is 0.6 Ω?
239.6 V
What happens to the speed of a DC generator when the field current increases significantly?
Speed increases
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?
1.2 Ω
In a DC generator, what does the field voltage Vf represent?
Field circuit current
What is the significance of the pole flux in a DC generator?
Induces voltage in the armature coils
Which type of DC generator has the equation Ea = Vt + IaRa and vt = IfRf?
DC shunt generator
What is the role of the DC excitation/field current in a generator?
Produces the pole flux
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?
25,000 rpm
What could be the effect on generated voltage if there is a significant increase in armature resistance in a DC generator?
Generated voltage decreases
When operating at no load, what is typically observed about the speed of a DC generator compared to when it is loaded?
No-load speed is lower than loaded speed
Learn about the two types of compound DC motors based on the nature of compounding: cumulative compound DC motor and differential compound DC motor. Understand how the shunt and series windings are arranged in each type.
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