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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

None of these
 rotor resistance R
 both 1 and 2
 rotor reactance X

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of induced emf.
 direction of motion of the conductor.
 opposite to the direction of motion of the conductor.
 direction of flux.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 8
 1
 4
 2

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

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

 Shunt.
  Separately excited.
  Compound.
  Series.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 50, 1500.
 1440, 1500.
 60, 1440.

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