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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
 zero
 maximum
All of these

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Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  simple in construction.
  less maintenance.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 60 V.
 40 V.
 30 V.
 90 V.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 between zero and infinity.
 approach zero.
 aprroach infinity.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and field current
 short circuit current and field current
 short circuit current and armature current
 no load voltage and armature current

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor run.
  capacitor start.
  shaded pole type.
  split phase.

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