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Electrical Machines

Electrical Machines
Maximum power developed depends on

 load angle
 voltage
 both 1and 2
 reactance

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

None of these
  Transistor series regulator.
  Transistor shunt regulator.
  Zener diode shunt regulator.

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
None of these
 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and indirect axis
 quadrature axis and interpolar axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Remains unchanged.
 Oscillates around the rated speed.
 Increases.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 200 V.
 150 V.
  223.V.
 300 V.

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