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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Resistance split phase
 Capacitor run
 Shaded pole

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 2 to 3.
 3 to 5.
 1.0.

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

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Cumulative compound motor.
  Series motor.
  Differential compound motor.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V²
 V
 f

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  less noise.
  locking tendency is reduced.
  uniform torque.

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