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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 triangular wave.
 square wave.
 sine wave.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 can not be determined.
 133.22 N-m
 266.20 N-m.
 234.76 N-m.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 radiation.
 conduction.
  convection.

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Electrical Machines
A DC compound motor has

 only shunt field winding.
 tertiary winding.
 both shunt and series field winding.
 only series field winding.

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

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

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 DC shunt motor.
 Universal motor.

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