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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  cast iron.
  stainless steel.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1 / N2.
  E1 / E2 = 1.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1kw1 / N2kw2.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 dependent upon the load.
 90o.
 180o.

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  silicon steel.
  closed grained cast iron.
  aluminium.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.
  single phase winding.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ 1/V
 T ∝ V
 T∝ V²

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