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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Domestic pump.
  Lift.
  Traction.

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
 brushes should be of proper grade and size.
All of these
 brushes should smoothly run in the holders.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
None of these
 both 1 and 2
 rotor resistance R

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 any of the above.
 three phase to single phase transformation.
 three phase to two phase transformation.

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

 commutation.
 development of torque.
 generation of voltage.
 electromechanical energy conversion.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.04, 1.96
 0.02, 1.98
 0.02, 0.98

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