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Electrical Machines

Electrical Machines
Maximum power developed depends on

 voltage
 reactance
 both 1and 2
 load angle

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
 1Ω.
 0.25Ω.
  0.23Ω.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 decreases.
 remains constant.
 decreases

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Stepper motors.
  Induction motors.
  Universal motors.

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 increase.
 any of the above.
 decrease.
 remain constant.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 94%
 92%
 95%

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