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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
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 35 Hz.
 20 Hz.
  Can be determined.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 rectangular.
 sinusoidal.
 trapezoidal.
  triangular.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Rheostatic control.
  Ward Leonard control.
  Any of above method.
  None of above.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  star.
  delta or star according to need.
None of these
  delta.

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MORE MCQ ON Electrical Machines

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