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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

  2.
 6.
 4.
  8.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 commutator
 starters
 field winding

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

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

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Amperes law.
 Coulombs law.
 Newtons law.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 1440, 1500.
  60, 1500.
 50, 1500.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 copper loss.
 hysteresis loss.
 eddy current loss.

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