Electrical Machines Questions and Answers – Induction Machines
Armature Windings Questions
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The commutator pitch for a simplex lap winding is equal to
Correct!
Wrong!

Concentrated winding differ from distributed winding with the concern of
Correct!
Wrong!

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!

The simplex lap winding has the range of winding pitch of
Correct!
Wrong!

Which of the following machines can be used to place open slot winding?
Correct!
Wrong!

DC machines have ________ windings and synchronous machines use ______ windings.
Correct!
Wrong!

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
Correct!
Wrong!

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!

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
Correct!
Wrong!

Commutator segments in a DC shunt machine is equal to the number of
Correct!
Wrong!

For an electrical machine with C number of coils and P poles, the distance between the coils connected by an equalizer ring is
Correct!
Wrong!

We can place closed windings in
Correct!
Wrong!

With a Ppole DC machine with armature current Ia, the current per brush arm for a lap connected windings is
Correct!
Wrong!

We can employ dummy coils in a DC machine to
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
Correct!
Wrong!

In AC machines we should prefer double layer winding over single layer windings because
Correct!
Wrong!
