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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
None of these
 both A and B
 above rated speed

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

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Electrical Machines
In alternator, the rotary part is

 core.
 none of these.
 armature.
  magnetic field poles.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  sR2 = X2.
  R2 = s2X2.
  R2 = sX2.
  R2 = s2X2.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 eddy current torque.
 no torque.
 both 1 and 2.
 damping torqe.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 8 Ω.
  4 Ω.
 10 Ω.
  2 Ω.

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