generator effiencys very stuck

Discussion in 'Homework Help' started by lugsey2k4, Jun 12, 2008.

  1. lugsey2k4

    Thread Starter New Member

    Jun 12, 2008
    1
    0
    hello could any one help me on these 2 questions as i dont have a clue were to start.
    Determine the overall efficiency of the following:

    a) A 10kW shunt generator having an armature resistance of 0.75Ω and a field resistance of 125Ω, generates a terminal voltage of 250V at full load. Assume the iron, friction and windage losses amount to 600W.

    b) A 320V shunt motor takes a total current of 80A and runs at 1000 revs/ min. If the iron, friction and windage losses amount to 1.5kW, the shunt field resistance is 40Ω and the armature resistance is 0.2 Ω.
     
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