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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 copper loss
 total iron losses
 eddy current loss
 hysteresis loss

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 equal to primary.
 less than primary.

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

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

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Electrical Machines
A DC series motor must started on no load because it would

 Draw more current without producing sufficient torque.
 Not develop starting torque.
  Run at dangerously high speed.
 Fail to start without load.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 27 A.
 11.5 A.
 23 A.
  13.5 A.

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

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

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MORE MCQ ON Electrical Machines

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