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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 any of the above
 less than

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  level compound.
  shunt generator.
 series generator.
  short - shunt generator.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 high filed circuit resistance.
 all of these.
 zero or very low voltage supply.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

  223.V.
 150 V.
 200 V.
 300 V.

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Electrical Machines
The armature shaft must be able to with stand

 Bending moment due to weight of the armature.
 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.
All of these

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Electrical Machines
The function of field regulator in a DC compound motor is to

 control field current.
 none of above.
 vary the armature resistance.
 limit the armature current.

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