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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 non reversing drive
 reversing drive
None of these

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

  0 Volt.
 1500 Volt.
 1600 Volt.
 2000 Volt.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  repulsion motor type starting.
  synchronous motor.
  transformer with short-circuited secondary.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 300 W
 400W
 500 W
 250 W

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 72.5%
 78.5%
 67.5%
 82.5%

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 750 rpm
 1000 rpm
 1500 rpm

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