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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Nr
 Ns

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
  DC of slip frequency.
 DC.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
  Output power at the shaft.
 Power drawn in KVA.
 Gross power.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 uneven air-gap length
 non-sinusoidal nature of armature mmf

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 3.2% and -1.6%
 6% and -4%

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Wave winding
 Lap winding
 None of above
 Both lap and wave winding

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MORE MCQ ON Electrical Machines

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