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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 3KW
 2KW
 0.5Kw
 1.5KW

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Electrical Machines
Slip test is performed to determine

 direct axis reactance and quadrature axis reactance
 slip
All of these
 positive sequence reactance and negative sequence reactance

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 240 V.
 220 V.
 150 V.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Equalizer rings.
 Commutator.
 Eye bolt.
 Dummy coils.

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Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f1.5.
 f2.

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Electrical Machines
Under commutation results in

  sparking at the middle of the brush.
  no sparking.
  sparking the trailing edge of the brush.
  sparking at the leading edge of the brush.

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