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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f1.5.
 f2.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 remains constant.
 decreases.
 increases.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of cork gaskets used in transformer.
 condition of oil in transformer.
  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid over heating.
All of these
 to achieve a stronger magnetic field.
 to avoid locking of the armature.

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Electrical Machines
Which of the following statements are correct ?

None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
  340 A.
  460 A.

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