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Electrical Machines

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

 20°
 30°
 60°
 18°

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 burn.
 not run.
 run at normal speed.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Armature current.
 Line current.
 Field current.
 None of above.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 1 and 3
 2 alone
 1, 2 and 3

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 copper.
  carbon.
 mica.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  of low resistivity.
  easy to cast owing to its low melting point and is easily available.
  lighter in weight.
  cheaper in cost.

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