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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 no voltage.
 maximum current.
 maximum power.
 maximum voltage.

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Electrical Machines
The type of DC motor used for shears and punches is

 Differential compound motor.
 Series motor.
 Shunt motor.
  Cummulative compound motor.

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Electrical Machines
The three point starter is used for

  Shunt, compound and series motor.
  Shunt motor.
  Series motor.
  Shunt motor as well as compound motors.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 both B and C
 over compound generator
 shunt generator

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A capacitor.
 an inductor.
 A resistor.
  None of these.

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

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