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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 copper loss
 mechanical loss
 both A and B

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
None of these
 MNA
 either GNA or MNA

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 24°.
 30°.
 45°.
  10°.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.01 pu.
 0.16 pu.
  0.08 pu.

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 120°.
 30°.
 90°.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 133.22 N-m
 can not be determined.
 266.20 N-m.

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