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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 Cos (α/2)
 sin (α/2)
 Cos α

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S
 PZL/4Sa²

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 30°
 72°
 18°

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 zero
 20 V
 50 V

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Cumulative compound motor.
  Series motor.
  Differential compound motor.
  Shunt motor.

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Electrical Machines
A short circuit test on a transformer gives

  copper loss at any load.
 copper loss at full load.
 copper loss at over load.
 copper loss at half load.

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