Electrical Machines Questions and Answers – Induction Machines
Armature Windings Questions
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In AC machines we should prefer double layer winding over single layer windings because
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Wrong!

The simplex lap winding has the range of winding pitch of
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With a Ppole DC machine with armature current Ia, the current per brush arm for a lap connected windings is
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Which of the following machines can be used to place open slot winding?
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We can employ dummy coils in a DC machine to
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Consider a dc machine having its armature wound in lap fashion having 12 coils and each resistance 0.1 ohms.
If it is measured resistance between two adjacent commutator segments, the result will be
If it is measured resistance between two adjacent commutator segments, the result will be
Correct!
Wrong!

While doing regular checks on the dc machine with the lap connected winding, it is reported to have ammeter fluctuations, this can be due to
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For an electrical machine with C number of coils and P poles, the distance between the coils connected by an equalizer ring is
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Concentrated winding differ from distributed winding with the concern of
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A 6pole lap wound DC generator has a developed power of P watts and brush voltage of E volts.
Three adjacent brushes of the machine had been found worn out and got open circuited.
If the machine is operated with the remaining brushes, voltage and power that could be obtained from the machine are
Three adjacent brushes of the machine had been found worn out and got open circuited.
If the machine is operated with the remaining brushes, voltage and power that could be obtained from the machine are
Correct!
Wrong!

The commutator pitch for a simplex lap winding is equal to
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For a given dc machine it is advised to use the dummy windings for a stable operation. But if it has be replaced as it unused component in the machine, then we must
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DC machines have ________ windings and synchronous machines use ______ windings.
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A 200V dc machine has 4 poles and 40 coils, having simplex lap winding. The number of commutator segments which required in the given machine will be
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We can place closed windings in
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Commutator segments in a DC shunt machine is equal to the number of
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