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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 210 V
 150 V.
 230 V.
 240 V.

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 high and low
 low and low
 low and high

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

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

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Electrical Machines
A crusher is equipped with

 DC shunt motor.
 Reluctance motor.
 Slip ring induction motor.
 Synchronous motor.

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