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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  cast iron.
  mild steel.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.649.
 0.443.
 0.512.

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Electrical Machines
In DC generator, armature reaction refers to what?

  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 1000.
 2000.
 0.

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc)1.6 × full Load.
 (Pi / Pc) × full Load.
 (Pi / Pc)2 × full Load.

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 DC Shunt Motor
 Both Synchronous and Induction motor
 Synchronous motors

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