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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
None of these
 armature reaction.
  permanent magnets.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 equal to primary.
 greater than the primary.
 less than primary.
 any of the above.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 500 rpm
 250 rpm
 1000 rpm

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Electrical Machines
Alternator operates on the principle of

  self induction.
  mutual induction.
  electromagnetic induction.
  self or mutual induction.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 250 A.
 340 A.
 440 A.
 570 A.

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