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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
  270.
 180.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 both 1 and 2
 high slip region
 unity slip
 low slip region

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  provide starting torque only.
  reduce the eddy currents.
  prevent hunting and provide the starting torque.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
 static induced emf.
 both A and B.
None of these

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 23.06 kW.
 26.21 kW.
 24.11 kW.

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
 Rotational loss
 Iron loss
All of these

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