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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 GNA
 MNA
 either GNA or MNA

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 36
 72
 37

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Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 Induction motor.
 DC motor.
 Both A and C.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 shunt field connections.
 armature or field connections.
 series field connections.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will reduce
 its speed will increase
 its efficiency will improve

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 65 V
 460 V
 230 V

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