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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 0 Hz
 50 Hz

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 180o.
 90o.
 0o.
 dependent upon the load.

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Electrical Machines
For standing a DC motor a starter is required because

None of these
  it limits the starting current to a safe value.
  It starts the motor.
  it limits the speed of the motor.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 1/√3
 3
 1/3

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

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

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL − NfL.
 NnL/NfL.

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MORE MCQ ON Electrical Machines

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