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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 3000 rpm
 4000 rpm
 1000 rpm

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when power factor is unity.
  when load varies.
  when supply voltage fluctuates.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque only.
  high staring torque and high power factor.
  high power factor only.
  none.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Both 1 and 2
 Copper losses
 Eddy current losses
 Hysteresis losses

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Electrical Machines
Maximum power developed depends on

 both 1and 2
 reactance
 load angle
 voltage

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.649.
 0.443.
  0.573.

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MORE MCQ ON Electrical Machines

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