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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
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 40 V.
 60 V.
 0 V.
 20 V.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  rotor can not have any laminations.
  sipper.
  thinner.
  thicker.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor run
 Resistance split phase
 Shaded pole
 Capacitor start

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  less heating of the rotor.
  all of these.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

 20 N.
  None of these.
  15 N.
  Can't be determined.

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