1 files changed, 23 insertions, 0 deletions
diff --git a/3760/CH4/EX4.67/Ex4_67.sce b/3760/CH4/EX4.67/Ex4_67.sce
new file mode 100644
index 000000000..5043f2b36
--- /dev/null
+++ b/3760/CH4/EX4.67/Ex4_67.sce
@@ -0,0 +1,23 @@
+clc;
+p=10000; // rated power of generator
+v=250; // rated voltage of generator
+l1=400; // rotationl losses
+ra=0.5; // armature resistance
+rf=250; // shunt field resistance
+ifl=v/rf; // constant field current
+lc=ifl*rf+l1; // constant losses
+io=p/v; // output current of generator
+ia=io+ifl; // armature current
+la=ia^2*ra; // armature circuit loss
+ps=p+lc+la; // generator shaft power input
+printf('Generator shaft power input is %f W\n',ps);
+ng=(1-((lc+la)/ps))*100; 
+printf('Efficiency at rated load is %f percent\n',ng);
+// at maximum efficiency variable losses= constant losses
+ia=sqrt(lc/ra); // armature current at maximum efficiency
+io=floor(ia)-ifl; // output current of generator
+po=v*io; // output power
+printf('Generator output at maximum efficiency is %f W\n',po);
+pi=po+2*lc;
+nm=(1-((lc+lc)/pi))*100; 
+printf('Maximum efficiency is %f percent\n',nm);