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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
 none of these.
 core.
  magnetic field poles.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1820W
 1920W
 2000W

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  mechanical losses.
  ohmic losses.
  hysteresis losses.

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 reduce losses
 convert AC armature current in to DC
 increase efficiency

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

 45°
 10°
 60°
 30°

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 1
 50
 100

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