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Electrical Machines

Electrical Machines
Universal motors are used in

 cranes
 traction
 food processing
All of these

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 60 V.
 40 V.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Cumulative compound motor.
  Series motor.
  Shunt motor.

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature in the polar axis.
 commutator in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.

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Electrical Machines
A compound motor has

  tertiary winding.
  both shunt and series field winding.
  only series field winding.
  only shunt field winding.

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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.
 24.11 kW.
 25 kW.
 26.21 kW.

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MORE MCQ ON Electrical Machines

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