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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 copper loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  DC series motor.
  AC slip ring motor.
  Synchronous motor.

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Electrical Machines
Damper winding is used to

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

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  aluminium.
  phosphor bronze.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 decrease starting torque
 increase pull out torque
 reduce magnetising current and improve power factor
 improve starting torque

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmax to Imin
 Vmin to Imax
 Vmin to Imin

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