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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 9/16.
 16/9.
 3/4.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
  region under main pole.
None of these
 throughout the air gap.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Blowers and fans.
  All of this.
 Lathes.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Both wave and lap winding.
 Lap winding.
 No wave and lap winding.
 Wave winding.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and excitation
 supply voltage, load angle and excitation
 excitation and load angle
 supply voltage and load angle

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
  240 rpm.
 450 rpm.
  470 rpm.

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