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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Both 1and 2
 Speed of alternators should be same
 Frequency should be same
 Terminal voltage is same

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 3
 1, 2 and 3
 1 and 2

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Both B and C.
 Permanent magnets.
 None of the options.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 roller bearings → large machines
 ball bearings → small machines
 both A and B

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/3, 1/√3
 1/√3, 1/√3
 1/3, 1/3

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