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Electrical Machines

Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Carbone brush.
 Starter.
 Armature.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
  1 - Φ synchronous motor.
 3 - Φ induction motor.
 DC motor.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  √Ia.
  1/Ia.
  Ia.

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
 unity power factor
None of these
 leading power factor

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  cost of operation.
  breaking torque.
  starting torque.

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Splash proof.
 Open type.
 Drip proof.

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MORE MCQ ON Electrical Machines

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