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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/√3
 1/3

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Electrical Machines
Damper winding is used to

 decrease the load current.
 increase the load current.
 both 1 and 2.
 suppress the hunting.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
  Stepper motor.
 Shaded pole motor.
 Hysteresis motor.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Hysteresis losses
 Eddy current losses
 Both 1 and 2

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Periodic variation of load.
  Small and constant load.
  Over-loading for long period.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor start.
  split phase.
  shaded pole type.
  capacitor run.

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