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Electrical Machines

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

 18°
 30°
 72°
 36°

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high initial cost.
 high maintenance cost.
 poor overall efficiency.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 ∞
 a finite negative value
 a positive finite value
 0

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V – IaRa.
  E = V + IaRa.
 E = V + Ia.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the series field
 in series with the shunt field
 in parallel with the series field
 in parallel with the shunt field

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Open slot type machines.
 Semi closed slot type machine.
 Any of the above.

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MORE MCQ ON Electrical Machines

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