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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 1/3
 √3
 3

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 60 V.
 0 V.
 20 V.
 40 V.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 makes the material brittle.
All of these
 Increases cost.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1130 r.p.m.
 963.8 r.p.m.
 4575.4 r.p.m.
 1037.5 r.p.m.

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

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

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the starting current to a safe value.
  it limits the speed of the motor.
  It starts the motor.
None of these

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