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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  DOL.
  star delta.
None of these
  both A and B.

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
  zero.
 positive.
 negative.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thin
 large and thick

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

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 eddy current loss.
  copper losses.
 core loses only.
 hysteresis loss.

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 provide protection against Low-Voltage.
 all of above.
 limit the starting current to a safer value.

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