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Electrical Machines

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

 radiation.
  convection.
 conduction.
All of these

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and indirect axis
 direct axis and interpolar axis
 quadrature axis and direct axis
 quadrature axis and interpolar axis

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 11.5 A.
  13.5 A.
 27 A.
 23 A.

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Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  electromagnetic torque.
  maximum torque.
  starting torque.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Ward-Leonard control.
 Multiple voltage control.
 Armature control.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 supply frequency
 load current
 maximum flux density
 both 2 and 3

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