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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
 AC.
None of these
 DC.

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

 94%
 92%
 95%
 96%

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer voltage
 direct current
 rated transformer current

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Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 flux(φ)
 both A and B
 armature current(Ia)

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 76.91 V.
 86.91 V.
 56.91 V.
  66.91 V.

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Electrical Machines
The three point starter is used for

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

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