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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.04
 0.4
 0.02

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 generation of voltage
 electromechanical energy conversion
 commutation

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 commutation
 reduction in main field flux
 reduces the terminal voltage

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Electrical Machines
Universal motor have which of the following application?

  Lift.
  Food mixer.
  Traction.
  Domestic pump.

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Electrical Machines
Transformer action requires a

 alternating electric flux.
 increasing magnetic flux.
 constant magnetic flux.
 alternating magnetic lux.

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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

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

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