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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
  10 HP.
  13 HP.
 14 HP.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 3
 √3
 1/3

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 18°
 20°
 60°

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and load
 supply voltage, frequency and load
 supply voltage and frequency
 supply voltage

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  stainless steel.
  aluminium.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.1.
  0.05.
  1.0.

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