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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less cost.
  all of below.
  less maintenance.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 through inductive coupling
 in series
 either of these depending on the design of the motor
 in parallel

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  2 Ω.
 10 Ω.
  4 Ω.
 8 Ω.

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Electrical Machines
Rotor resistance speed control is used in

 slip ring induction motor.
 squirrel cage induction motor.
 synchronous motor.
 dc shunt motor.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 changing the field excitation.
 varying the applied voltage.
 varying the speed.

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

 synchronous reactance
 load angle
 both 1and 2
 excitation

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