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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 180o.
 90o.
 0o.
 dependent upon the load.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 field current control
All of these
 supply voltage control
 armature circuit resistance control

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
The back emf produced in a dc motor depends on

  P.
  P and Z.
  none of these.
  Z.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  crawling.
  harmonics.
  cogging.
  resonance.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I/2 and P/4
 V, I/2 and P/2
 V/2, I and P/2
 V, I and P

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