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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 DC machine
All of these
 Synchronous machine
 Induction machine

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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

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

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  about 50 V.
  about 2 V.
  220 V.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 greater than the primary.
 equal to primary.
 any of the above.
 less than primary.

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Electrical Machines
Which of the following are variable losses?

 hysteresis loss
 armature copper loss
 eddy current loss
 shunt field copper loss

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 2 and 3.

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