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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  stainless steel.
  cast iron.
  mild steel.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4S
 PZL/ 4Sa
 PZL/4SP²
 PZL/4Sa²

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 Low load.
 No load.
 None of these.

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
 compensating winding.
  high resistance carbon brushes.
  any one or more of the above methods.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.5+j5.8 ohms
 53+j85 ohms
 3.05+j5.08 ohms

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at over load.
  copper loss at any load.
 copper loss at full load.
 copper loss at half load.

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