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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  50 Hz.
  16.67 Hz.
  60 Hz.
  25 Hz.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 2, 3, 6
 3, 4, 5
 2, 4, 5, 6
 1, 2, 5

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Rheostatic control.
  None of above.
  Ward Leonard control.
  Any of above method.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 increase
None of these
 decrease

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

  190 A.
 127 A.
 173 A.
 240 A.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
None of these
  magnetizing electric current and back emf.
  the supply voltage and the back emf.

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