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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 60 Hz
 25 Hz

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

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

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and short circuit tests.
 open circuit and zero power factor tests.
 zero power factor and slip tests.
 short circuit and slip tests.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 unshaded, shaded
 unshaded, unshaded
 shaded, shaded
 shaded, unshaded

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 shunt generator
 series generators
 both B and C
 over compound generator

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper
 copper alloy

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