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Electrical Machines

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

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
 None of these.
 Full load torque.
  Full load current.

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Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Motor frame.
 Armature.
 Field.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 100W
 500W
 1000W

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid over heating.
 to avoid locking of the armature.
All of these

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
 DC.
None of these
 both of above.

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