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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?

 30 rpm
 1500 rpm
 zero
 1470 rpm

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/√5
 1/√2
 1/3

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 30 W.
 36 W.
 25 W.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1440.
  1435.
 1450.
 1500.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 roller bearings → large machines
 ball bearings → small machines
 both A and B

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