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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 either GNA or MNA
 MNA
None of these

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
  universal motor.
 repulsion motor.
 reluctance motor.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 0°.
 45°.
  75°.
 30°.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 50 / 3.
 1.
  slip X 59 / 3.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 3.1 Ω
 1.79 Ω
 1.8 9 Ω

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 vibrations.
 eddy electric current loss.
 copper loss.

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