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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 850 rpm
 900 rpm

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Electrical Machines
What are the starters used for starting of cage motors?

 Auto transformer starter.
 DOL starter.
 Star-delta starter.
  All of these.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 non uniform cylindrical.
  salient.
 none of these.
 cylindrical.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 400 V.
 200 V.
 100 V.
 800 V.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
 Demagnetization
 Cross magnetization
None of these

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 high voltage and low current applications.
  high current and low voltage applications.
 where greater load is connected.

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