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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmax to Imax.
 Vmin to Imax.
 Vmin to Imin.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  250 V.
  zero.
 about 100 V.
  very small, say about 2 or 3 V.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
  6.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.

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Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC and DC
 AC
 DC

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Faradays law of electromagnetic induction.
 Coulombs law.
 Newtons law.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  By varying the supply frequency.
  By varying number of poles.
  Both (A) and (B).

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