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Electrical Machines
In a DC generator the emf generated by the armature is maximum when
induced voltage is high.
shaft rotation is high.
rate of change of flux is minimum.
rate of change of flux is maximum.
induced voltage is high.
shaft rotation is high.
rate of change of flux is minimum.
rate of change of flux is maximum.
Answer
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Related Question
Electrical Machines
Which of the following are variable losses?
hysteresis loss
armature copper loss
eddy current loss
shunt field copper loss
hysteresis loss
armature copper loss
eddy current loss
shunt field copper loss
Answer
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Electrical Machines
The output power of any electrical motor is taken from the
Armature.
Field.
Motor frame.
Coupling mounted on the shaft.
Armature.
Field.
Motor frame.
Coupling mounted on the shaft.
Answer
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Electrical Machines
Which of the following methods of speed control is not affected through stator side?
Change of rotor resistance.
Change of number of pole.
Change of supply frequency.
Change of supply voltage.
Change of rotor resistance.
Change of number of pole.
Change of supply frequency.
Change of supply voltage.
Answer
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Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is
1/4.
8.
1/2.
4.
1/4.
8.
1/2.
4.
Answer
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Electrical Machines
Which of the following DC generators has rising V-I characteristics?
None of them.
Compound.
Series.
Shunt.
None of them.
Compound.
Series.
Shunt.
Answer
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