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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv.
 Blv2.
 Bl2v2.
 Bl2v.

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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?

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

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  air gap.
  cogging.
  crawling.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 V
 f
 f²

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 399 V.
 50 V.
 100 V.

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 Both Synchronous and Induction motor
 DC Shunt Motor
 Synchronous motors

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