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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f1.6
 f²

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
 low starting torque operation.
 constant speed operation.
  high starting torque operation.

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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 lap-winding ?

 PZL/4Sa²
 PZL/4S
 PZL/4SP²
 PZL/ 4Sa

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor run
 Capacitor start
 Shaded pole
 Resistance split phase

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

  0.24 Ω.
 0.66 Ω.
 0.45 Ω.
 0.78 Ω.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 turn- ratios are exactly equal
 polarities are properly connected
 percentage impedances are equal

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