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diff --git a/3864/CH6/EX6.11/Ex6_11.sce b/3864/CH6/EX6.11/Ex6_11.sce
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+clear
+//
+//
+
+//Initilization of Variables
+
+P=250*10**6 //N-mm/sec //Power transmitted
+n=100 //rpm
+q_s=75 //N/mm**2 //Shear stress
+
+//Calculations
+
+//From Equation of Power we have
+T=P*60*(2*%pi*n)**-1 //N-mm //Torsional moment
+
+//Now from torsional moment equation we have
+//T=j*q_s*(d/2**-1)**-1
+//After substituting values in above equation and further simplifying we get
+//T=%pi*16**-1**d**3*q_s
+d=(T*16*(%pi*q_s)**-1)**0.3333 //mm //Diameter of solid shaft
+
+//PArt-2
+
+//Let d1 and d2 be the outer and inner diameter of hollow shaft
+//d2=0.6*d1
+
+//Again from torsional moment equation we have
+//T=%pi*32**-1*(d1**4-d2**4)*q_s*(d1/2)**-1
+d1=(T*16*(%pi*(1-0.6**4)*q_s)**-1)**0.33333
+d2=0.6*d1
+
+//Cross sectional area of solid shaft
+A1=%pi*4**-1*d**2 //mm**2
+
+//cross sectional area of hollow shaft
+A2=%pi*4**-1*(d1**2-d2**2)
+
+//Now percentage saving in weight
+//Let W be the percentage saving in weight
+W=(A1-A2)*100*A1**-1
+
+//Result
+printf("\n Size of shaft is:solid shaft:d %0.3f  mm",d)
+printf("\n                :Hollow shaft:d1 %0.3f  mm",d1)
+printf("\n                :            :d2 %0.3f  mm",d2)