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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 V²
 f

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Electrical Machines
Synchronous condensers are used to

 improve the power factor
 reduce hunting
 improve starting torque
All of these

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Induction motors.
  Reluctance motors.
  Stepper motors.

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Electrical Machines
In DC machines shape of net flux density is?

 sine wave
 saddle shape
 flat tapped or trapezoidal
 peaky in nature

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

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

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

  0 Volt.
 1600 Volt.
 2000 Volt.
 1500 Volt.

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MORE MCQ ON Electrical Machines

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