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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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Electrical Machines
For pure resistive load what is the armature reaction?

 demagnetization
 cross magnetization
All of these
 magnetization

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
 cooling the armature.
  increasing the excitation.
  reducing the load voltage.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1037.5 r.p.m.
 1130 r.p.m.
 none of above.

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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°.
 30°.
  75°.
 45°.

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

 development of torque.
 electromechanical energy conversion.
 commutation.
 generation of voltage.

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MORE MCQ ON Electrical Machines

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