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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 1 Hz
 0 Hz

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 0.
 10 KW.
 8 KW.

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

 hard-drawn copper
 brass
 copper alloy
 copper

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 copper loss.
 both 1 and 2.
 eddy current loss.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm.
  KhfBm1.6.
 KhfBm3.
 Khf2Bm1.6.

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

 Nr
 Zero
 Ns
 S.Ns

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MORE MCQ ON Electrical Machines

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