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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.4
 0.02
 0.2

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

 45.
  270.
 30.
 180.

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 current.
 speed.
 torque.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 6 V
 somewhat more than 230 V
 230 V

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 less than
 any of the above
 greater than

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imin.
 Vmax to Imax.

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