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Electrical Machines

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

  75°.
 30°.
 0°.
 45°.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
 29 Amp.
  43 Amp.
  33.33 Amp.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The armature current will reduce.
 The speed of motor will be reduced.
 DC Shunt Motor
  The motor will attain dangerously high speed.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
  s.
 1 - s.
  2 - s.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to single phase transformation.
 three phase to two phase transformation.
 any of the above.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia2
 1/Ia
 I/Ia2
 Ia

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