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Electrical Machines

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

 hard-drawn copper
 copper alloy
 copper
 brass

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 excitation
 load angle
 synchronous reactance
 both 1and 2

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 zero.
 leading.
  lagging.

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Electrical Machines
Scott connections are used for

 three phase to single phase transformation.
 three phase to two phase transformation.
 any of the above.
 single phase to three phase transformation.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Small and constant load.
  Over-loading for long period.
  Over-excitation.
  Periodic variation of load.

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Electrical Machines
Which of the following motor used in hair dryers?

  Shaded pole IM.
  Cage induction motor.
  Split phase IM.
  Synchronous motors.

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