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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  both.
  none.
  larger output.

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

 18°
 20°
 30°
 60°

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Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P.
  none of these.
  P and Z.

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 neither 1 nor 2
 both A and B
 ball bearings → small machines

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
None of these
  It starts the motor.
  it limits the speed of the motor.

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

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

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