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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 V²
 V
 f

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
  reducing the load voltage.
  increasing the excitation.
 cooling the armature.

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
 1-phase induction motor
None of these
 3-phase induction motor

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  reduces the saturation magnetization.
  increases the hysteresis loss.
  increases the electrical resistivity of iron.

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Electrical Machines
Short circuiting is caused in the armature winding due to

 failure of insulation between two commutator bars.
  any of above.
  grounding of two or more turns of the same coil.
  failure of insulation between two turns of coil.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 350 V.
 420 V.
 400 V.
 480 V.

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