initial commit / add all books

1 files changed, 38 insertions, 0 deletions

diff --git a/1445/CH8/EX8.3/ch8_ex_3.sce b/1445/CH8/EX8.3/ch8_ex_3.sce
new file mode 100644
index 000000000..198d7214a
--- /dev/null
+++ b/1445/CH8/EX8.3/ch8_ex_3.sce
@@ -0,0 +1,38 @@
+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 3
+
+disp("CHAPTER 8");
+disp("EXAMPLE 3");
+
+//VARIABLE INITIALIZATION
+p_o=10*1000;                //output of generator in Watts
+v_t=250;                    //terminal voltage in Volts
+N=1000;                     //speed in rpm
+r_a=0.15;                   //armature resistance in Ohms
+I_f=1.64;                   //field current in Amperes
+rot_loss=540;               //rotational loss in Watts
+
+//SOLUTION
+
+//solution (i)
+I_l=p_o/v_t;
+I_a=I_l+I_f;
+E_a=v_t+(I_a*r_a);
+disp(sprintf("(i) The armature induced emf is %f V",E_a));
+
+//solution (ii)
+w=(2*%pi*N)/60;              //in radian/sec
+T_e=(E_a*I_a)/w;
+disp(sprintf("(ii) The torque developed is %f N-m",T_e));
+
+//solution (iii)
+arm_loss=(I_a^2)*r_a;        //armature loss
+fld_loss=v_t*I_f;            //field loss
+tot_loss=rot_loss+arm_loss+fld_loss;
+p_i=p_o+tot_loss;
+eff=(p_o/p_i)*100;
+disp(sprintf("(iii) The efficiency is %f %%",eff));
+
+//END
+
+