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Electrical Machines

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

  13 HP.
 14 HP.
 15 HP.
  10 HP.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos (α/2)
 sin (α/2)
 Cos α
 Cos α²

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 500 rpm
 2000 rpm
 1000 rpm

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Synchronous motor.
  Single phase induction motor.
  AC slip ring motor.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  variable frequency.
  variable supply voltage.
  windage friction.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 1000 rpm
 950 rpm
 975 rpm

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