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Electrical Machines

Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
 35°C.
  45°C.
 27°C.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
 0.6.
 0.8.
  1.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

 armature reaction.
  residual magnetism.
  permanent magnets.
None of these

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1600W, 800W
 1000W , 1400W
 1400W, 1000W
 800W, 1600W

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Electrical Machines
The flux involved in the emf equation of a transformer has

 average value.
 rms value.
 total value.
  maximum value.

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