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Electrical Machines

Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 copper losses.
 dielectric losses.
 stray losses.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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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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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 copper loss
 iron loss
 both A and B

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120P / N Hz.
  PN / 2 Hz.
 120N / P Hz.
 120 / PN Hz.

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Electrical Machines
The induction motor shaft is made of

  aluminium.
  cast iron.
  stainless steel.
  mild steel.

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