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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 Armature current Ia.
 All of these.
 Applied voltage.

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  provide return path for the flux.
  protect the whole machine.
  hold armature stamping in position.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  capacitor run IM.
  repulsion motor type starting.
  synchronous motor.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

None of these
 armature resistance control
 same in both methods
 field weakening method

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 armature circuit
 shunt field
 none of above
 both A and B

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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

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

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