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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 Cos α²
 sin (α/2)
 Cos (α/2)

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Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 1
 infinite value

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 150 Ω.
  375 Ω.
 225 Ω.
 145 Ω.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 36 W.
 25 W.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a positive finite value
 a finite negative value
 0
 ∞

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Electrical Machines
In DC generator, lap winding is used in

  high current and low voltage applications.
 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.

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