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Electrical Machines

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

 lap winding
 both 1 and 2
None of these
 wave winding

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  DC shunt motor.
  1 - φ IM.
  Universal motor.

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

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

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  10 HP.
  13 HP.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of crawling.
  increase the starting torque.
  reduce the chance of cogging.
  reduce the magnetizing current.

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
None of these
  it limits the starting current to a safe value.
  it limits the speed of the motor.

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