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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 low and high
 high and low
 high and high

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
Hunting in a synchronous motor takes place

  when supply voltage fluctuates.
  when load varies.
  motor is under loaded.
  when power factor is unity.

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Electrical Machines
Which of the following machine will have maximum efficiency?

 Electrical power generator.
 Induction motor.
  Electrical power transformer.
 DC motor.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = f1kw1 / f2kw2.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always opened.
  always closed.
  none.

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