initial commit / add all books

1 files changed, 30 insertions, 0 deletions

diff --git a/1445/CH8/EX8.2/Ex8_2.sce b/1445/CH8/EX8.2/Ex8_2.sce
new file mode 100644
index 000000000..0046becf5
--- /dev/null
+++ b/1445/CH8/EX8.2/Ex8_2.sce
@@ -0,0 +1,30 @@
+//CHAPTER 8- DIRECT CURRENT MACHINES
+//Example 2
+
+disp("CHAPTER 8");
+disp("EXAMPLE 2");
+
+// 230 V DC shunt machine 
+//VARIABLE INITIALZATION
+v_t=230;            //terminal voltage in Volts
+r_a=0.5;            //armature resistance in Ohms
+r_f=115;            //shunt field resistance in Ohms
+I_l=40;             //line current in Amperes
+
+//SOLUTION
+
+//for generator
+I_f=v_t/r_f;        //current through the shunt field winding
+I_a=I_l+I_f;        //Armature Current
+E_a=v_t+(I_a*r_a);  //E_a=emf of generator
+
+//for motor
+I_f=v_t/r_f;
+I_a=I_l-I_f;
+E_b=v_t-(I_a*r_a);  //E_b=emf of motor
+//ratio of speed as generator to speed as motor
+ratio=E_a/E_b;      //E_a:E_b=(k_a*flux*N_g):(k_a*flux*N_m) =>E_a:E_b=N_g:N_m (as flux is constant)
+disp(sprintf("The ratio of speed as a generator to the speed as a motor is %.3f",ratio));
+
+//END
+