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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
 20.
  0.905.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 load angle
 excitation
 synchronous reactance
 both 1and 2

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 equal to
 less than
 any of the above

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
 50 MW generator in a power plant.
 Fractional horse power high speed motor.
  Hermetically sealed motor of refrigerator.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

None of these
 Slip ring induction motor.
 Squirrel cage induction motor.
 Same in both induction motors.

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