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Electrical Machines
Rotating magnetic field is produced in an induction motor because of
either stator winding or rotor winding.
rotor winding.
None of these
stator winding.
either stator winding or rotor winding.
rotor winding.
None of these
stator winding.
Answer
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Related Question
Electrical Machines
Breadth factor is defined as the ratio of
both 1 and 2.
None of these
emf with concentrated winding to emf with distributed winding.
emf with distributed winding to emf with concentrated winding.
both 1 and 2.
None of these
emf with concentrated winding to emf with distributed winding.
emf with distributed winding to emf with concentrated winding.
Answer
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Electrical Machines
The armature of DC motor is laminated
to reduce the inductor.
to reduce the hysteresis loss.
to reduce the mass.
to reduce the eddy current loss.
to reduce the inductor.
to reduce the hysteresis loss.
to reduce the mass.
to reduce the eddy current loss.
Answer
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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?
Speed of alternators should be same
Both 1and 2
Terminal voltage is same
Frequency should be same
Speed of alternators should be same
Both 1and 2
Terminal voltage is same
Frequency should be same
Answer
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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.
40 volts.
30 volts.
20 volts.
10 volts.
40 volts.
30 volts.
20 volts.
10 volts.
Answer
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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings
V/2, I and P/2
V, I and P
V, I/2 and P/2
V/2, I/2 and P/4
V/2, I and P/2
V, I and P
V, I/2 and P/2
V/2, I/2 and P/4
Answer
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