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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  air gap flux.
  power factor.
  speed.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
 6.
  4.
  data provided is insufficient.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Field flux.
 All of these.
 Applied voltage.
 Armature current.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 26.21 kW.
 25 kW.
 24.11 kW.
 23.06 kW.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

  1 at 90°C.
 0.5 at 90°C.
 3 at 90°C.
 2 at 90°C.

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