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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 leading
 unity
 lagging

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 0.62.
 1.24.
 0.25.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 500 W
 400W
 250 W
 300 W

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 240 V
 175 V
 140 V
 120 V

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Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
None of these
 the brushes of same polarity should track each other.
  brush position has no effect on the commutator grooving.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  no magnetic core loss.
 less magnetic core loss.
  more copper loss.

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MORE MCQ ON Electrical Machines

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