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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 16/9.
 9/16.
 3/4.
 4/3.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to an AC source.
 to earth.
  to a DC source.

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Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
None of these
 both A and B
 above rated speed

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 Cos α
 sin (α/2)
 Cos α²

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
  60 Hz.
 0.70 Hz.
 0.75 Hz.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
All of these
 lagging power factor
 leading power factor

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