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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 60°
 30°
 10°
 45°

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

 over commutation.
  too rapid reversal of current.
  under commutation.
  any of the above.

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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.
 150 V.
 220 V.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

  salient.
 non uniform cylindrical.
 none of these.
 cylindrical.

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 decrease the amount of copper to be used.
 reduce the magnetic hum and locking tendency of rotor.
 increase the strength of rotor bars.
 provide ease of fabrication.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  both.
  none.
  larger output.

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