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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Motor frame.
 Armature.
 Field.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing of frequency.
  speed can not be increased.
  increasing number of poles.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 1.5 %.
  2.67 %.
 5 %.
  30 %.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 load current
 maximum flux density
 both 2 and 3
 supply frequency

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Both 1 and 2
 Hysteresis losses
 Eddy current losses

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Electrical Machines
Which of the following statements are correct ?

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

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