generator effiencys very stuck

Thread Starter

lugsey2k4

Joined Jun 12, 2008
1
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.
 
Top