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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor run
 Shaded pole
 Capacitor start

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Electrical Machines
The basic function of a transformer is to change

 the frequency
 the power factor
 the level of the voltage
 the power level

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 100 Ω
 50 Ω
 10 Ω

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.01 Ω.
  0.54 Ω.
 0.54 Ω.
 0.06 Ω.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 equal to primary.
 any of the above.
 greater than the primary.
 less than primary.

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

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

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