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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 32.
 8.
  4.

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 850 rpm
 1000 rpm
 950 rpm
 900 rpm

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 1000 rpm
 750rpm
 zero speed

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 less expensive.
 constant speed.
 not suitable for rapidly changing loads.
 none of above.

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Electrical Machines
Dynamic braking can be used for

 compound motors.
 shunt motors.
 series motors.
All of these

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
  rate of change of flux is maximum.
 induced voltage is high.
 shaft rotation is high.

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