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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
 traction
 food processing
All of these

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 power.
 torque.
 speed.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 2
 4
 6

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Split phase.
  Capacitor run.
  Universal.

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

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

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from supply.
  transposing any two leads from slip rings.
  transposing all the three leads from the supply.
  disconnecting any one phase.

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