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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 copper
 brass
 copper alloy

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Electrical Machines
A DC compound motor has

 both shunt and series field winding.
 only shunt field winding.
 tertiary winding.
 only series field winding.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
 Shaded pole type.
 Split phase type.
  Capacitor run type.

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

 both of above.
None of these
 DC.
 AC.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

  3600 A.
 600 A.
 2400 A.
 1200 A.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  s2.
  sf.

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MORE MCQ ON Electrical Machines

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