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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 1.644 KW.
 0.9103 KW.
 5.46 KW.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
 570 A.
  460 A.
  340 A.

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

 963.8 r.p.m.
 4575.4 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid locking of the armature.
 to achieve a stronger magnetic field.
 to avoid over heating.

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Electrical Machines
What is the effect of armature reaction ?

 None of the options.
  Both option B and C.
 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  uniform torque.
  locking tendency is reduced.
  less noise.

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