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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 480 V.
 350 V.
 420 V.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  reduces generator emf.
  increases armature speed.
  results in sparking trouble.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 both 1and 2
 load angle
 excitation
 synchronous reactance

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 MNA
 GNA
 either GNA or MNA

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

  Constant.
 Proportional to armature current.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 normal speed.
 synchronous speed.
 slip speed.

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