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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 1
 100
 10

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Both B and C.
 None of the options.
 Permanent magnets.
  Electromagnets.

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

 shunt generator
 series generators
 both B and C
 over compound generator

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduction in main field flux
 reduces the terminal voltage
 commutation

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 None of above.
 Increases.
 Remain unchanged

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor start
 Resistance split phase
 Shaded pole
 Capacitor run

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