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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Mild steel.
 Silicon steel.
 Fibre.

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Electrical Machines
Which of the following are variable losses?

 shunt field copper loss
 eddy current loss
 hysteresis loss
 armature copper loss

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A resistor.
 A capacitor.
 an inductor.
  None of these.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
  223.V.
 300 V.
 200 V.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 same.
 more.
 between 50% and 90%.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum
 Ra maximum and Rf maximum

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