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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and low
 low and low
 high and high

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3600 rpm.
 3000 rpm.
 500 rpm.
  600 rpm.

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer current
 rated transformer voltage
 direct current

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 None of above.
  Increases.
 Decreases.
 Remains unchanged.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 50 V.
 399 V.

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