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Electrical Machines

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

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

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 improve and the speed rises.
 deteriorate and the speed rises.
 deteriorate and the speed falls.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 generation of voltage
 commutation
 electromechanical energy conversion

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

 PZL/4Sp²
 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iw.

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Electrical Machines
A DC series motor must started on no load because it would

 Not develop starting torque.
 Draw more current without producing sufficient torque.
  Run at dangerously high speed.
 Fail to start without load.

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