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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 30 rpm
 zero
 1470 rpm

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
 increases.
  decreases.
  increases upto a limit and then remains almost constant.

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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 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.

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Electrical Machines
The inertia constant H of a synchronous condenser is

  none of these.
 greater than that of turbo alternator.
 equal to that of the effective length of the line.
 greater than that of hydro generator.

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

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

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Both A and B.
 Compensating winding will act under the pole.
 Inter pole winding will act in interpolar region.

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