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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 60°.
 30°.
 120°.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.

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Electrical Machines
The core flux in transformer depends mainly on

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

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 decrease
 increase
 either increase or decrease

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
  silicon steel.
 wrought iron.
 cast steel.

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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)

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

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