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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  stainless steel.
  cast iron.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Capacitor start.
  Split phase.
  Shaded pole.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 field winding
 commutator
 armature winding
 starters

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 3, 5
 1, 2, 5
 1, 2, 3, 4

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
 2 point starter
All of these
 4 point starter

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs Ia
 Eg vs load current
 Vt vs load current

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