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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

 9/16.
 3/4.
 4/3.
 16/9.

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

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

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 59.2%.
 88.8%.
 57.1%.
 48.0%.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
 1920 Watt.
  1960 Watt.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
 is always lagging.
 is always unity.
  depends on the power factor of the load.

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Electrical Machines
For larger units high torque it is preferred to use

 Universal motor.
 Partial motor.
 DC shunt motor.
 Slip induction motor.

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