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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 100Hz.
 150Hz.
 200Hz.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.6.
 0.8.
  1.

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Electrical Machines
Hunting in a synchronous cannot be due to

  windage friction.
  variable load.
  variable supply voltage.
  variable frequency.

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Electrical Machines
Which of the following bearings and their uses are correct

 both A and B
 ball bearings → small machines
 roller bearings → large machines
 neither 1 nor 2

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
  40 A.
 440 A.
 44 A.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 any of the above
 parabola
 hyperbola

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