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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.
 30.
 45.
 180.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 wooden insulation.
 rubber insulation.
 cotton insulation.
  paper insulation.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at brushes.
 None of these.
 Heavy sparking at the first stud of starting resistance steps.
 Both of above.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1/S
 S
 1-S

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
  3 Hz.
 10 Hz.
 50 Hz.

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

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

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