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Electrical Machines

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

 hard-drawn copper
 brass
 copper
 copper alloy

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 armature resistance control
 field weakening method
None of these

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  both.
  none.
  larger output.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 low current and low voltage
 low current and high voltage
 high current and high voltage
 high current and low voltage

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Electrical Machines
Dynamic braking can be used for

 series motors.
 compound motors.
 shunt motors.
All of these

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 1 V
 4 V
 0 V

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