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Electrical Machines

Electrical Machines
Maximum power developed depends on

 both 1and 2
 voltage
 load angle
 reactance

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 transformer insulating oil.
 steel core.
  winding conductors and steel structures of transformer.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 series motor
 differentially compounded motor
 permanent magnet motor

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction motor torque.
  synchronous motor torque.
  induction generator torque.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I/2 and P/4
 V, I/2 and P/2
 V/2, I and P/2
 V, I and P

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