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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmin to Imax.
 Vmax to Imax.
 Vmin to Imin.

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Electrical Machines
The armature shaft must be able to with stand

 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.
All of these
 Any unbalanced magnetic pull on the armature core.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has its field winding consinting of thick wire and less no of turns.
 Has a poor torque.
 Can be started easily without load.
 Has a almost constant speed.

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Electrical Machines
Hysteresis loss is proportional to

 f3.
 f2.
 f1.5.
  f.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
All of these
 zero
 minimum

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Electrical Machines
The functions of inter poles are

 both 1 and 2
 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.
None of these

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