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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 45.
 30.
 180.

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

 copper alloy
 copper
 hard-drawn copper
 brass

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 18°
 30°
 72°

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  series connected.
  deferentially compounded.
 shunt connected.
  cumulatively compounded.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 60°
 20°
 18°

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Electrical Machines
Ward Leonard control is provides speed control

  In both direction.
  Above rated speed.
  In one direction only.
  Below rated speed.

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