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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  375 to 500.
  720 to 920.
  500 to 720.

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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/4Sa²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC Shunt motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
  about 75°.
 0°.
 90°.

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 below rated speed.
 in both direction.
 above rated speed.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 5200 W
 1600 W and 5000 W
 3200 W and 2500 W
 1600 W and 1250 W

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