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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

  1.2.
 1.8.
 1.5.
 1.4.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 2, 3 and 4.
 1, 3 and 4.
  1, 2 and 3.
 2 and 4.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 266.20 N-m.
 234.76 N-m.
 133.22 N-m
 can not be determined.

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Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  none of these.
  EbIa2.

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 copper loss.
 both 1 and 2.
 eddy current loss.

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