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Electrical Machines

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

 GNA
None of these
 either GNA or MNA
 MNA

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 60°
 20°
 30°
 18°

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 4, 5, 6
 2, 3, 6
 1, 2, 5
 3, 4, 5

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of motion of the conductor.
 direction of induced emf.
 direction of flux.
 opposite to the direction of motion of the conductor.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 reduced size.
  quick acceleration.
 low starting torque.
 high efficiency.

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