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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
 wave winding
 lap winding
None of these

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the maintenance and repair
 increase the iron loss
All of these

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor series regulator.
  Zener diode shunt regulator.
  Transistor shunt regulator.
None of these

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 10 volts.
 20 volts.
 40 volts.
 30 volts.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1600 Volt.
 2000 Volt.
  0 Volt.
 1500 Volt.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 open type winding
 lap winding
 wave winding
 closed winding

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