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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
 2 to 3.
  1.5 to 2.
 3 to 5.

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start IM.
  Synchronous motor.
  Split phase IM.
  Capacitor start capacitor run IM.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
  Armature current and field current.
 Torque and field current.
 Armature current and torque.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
 armature circuit resistance control
All of these
 field current control

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Electrical Machines
Universal motors are used in

All of these
 food processing
 traction
 cranes

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