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diff --git a/1583/CH4/EX4.1/FSNT_Ex_4_1.sce b/1583/CH4/EX4.1/FSNT_Ex_4_1.sce
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+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.1 page no 108
+//given
+R=50//load resistance in ohm
+B=100//bandwidth in KHz
+Cf=5//filter center frequency in MHz
+L=R/(2*%pi*10^5)//inductance in micro henry
+C=((L)*(2*%pi*Cf*10^6)^2)^-1//capacitance
+mprintf('the inductance is %f uH \n the capacitance is %f pF ',L*1e6,C*1e12)
diff --git a/1583/CH4/EX4.1/Result_of_Chapter_4_Ex4_1.jpg b/1583/CH4/EX4.1/Result_of_Chapter_4_Ex4_1.jpg
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index 000000000..5bd144efc
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+++ b/1583/CH4/EX4.1/Result_of_Chapter_4_Ex4_1.jpg
diff --git a/1583/CH4/EX4.2/FSNT_Ex_4_2.sce b/1583/CH4/EX4.2/FSNT_Ex_4_2.sce
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index 000000000..d93b18e03
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+++ b/1583/CH4/EX4.2/FSNT_Ex_4_2.sce
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+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.2
+//given
+//Forty decibles corresponds to a voltage ratio of 100:1 therefore since A(jwo)=1
+Ajwo=0.01
+n=5//no. of harmonics
+Q=n/(Ajwo*(n^2-1))//quality point
+mprintf('the minimum circuit Q is =Qmin = %f ',Q)
diff --git a/1583/CH4/EX4.2/Result_of_Chapter_4_Ex4_2.jpg b/1583/CH4/EX4.2/Result_of_Chapter_4_Ex4_2.jpg
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index 000000000..e4100f7d3
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+++ b/1583/CH4/EX4.2/Result_of_Chapter_4_Ex4_2.jpg
diff --git a/1583/CH4/EX4.3/FSNT_Ex_4_3.sce b/1583/CH4/EX4.3/FSNT_Ex_4_3.sce
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index 000000000..d9685776a
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+++ b/1583/CH4/EX4.3/FSNT_Ex_4_3.sce
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+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.3 page no 115 
+//given
+L=10*10^-6//inductance
+C=10*10^-12//capacitance
+wo=(sqrt(L*C))^-1//resonant frequency(ignoring the finite resistance)
+Q=100
+rs=wo*L/Q//series resistance
+Rp=(wo*L)^2/rs//parallel resistance
+QL=50*10^3/(wo*L)//loaded Q
+mprintf('the loaded Q is %f ',QL)
diff --git a/1583/CH4/EX4.3/Result_of_Chapter_4_Ex4_3.jpg b/1583/CH4/EX4.3/Result_of_Chapter_4_Ex4_3.jpg
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index 000000000..a6b081899
--- /dev/null
+++ b/1583/CH4/EX4.3/Result_of_Chapter_4_Ex4_3.jpg
diff --git a/1583/CH4/EX4.4/FSNT_Ex_4_4.sce b/1583/CH4/EX4.4/FSNT_Ex_4_4.sce
new file mode 100755
index 000000000..44fef7c0d
--- /dev/null
+++ b/1583/CH4/EX4.4/FSNT_Ex_4_4.sce
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+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.4 page no 121
+//given
+L1=25*10^-6//primary inductance
+L2=400*10^-6//secondary inductane
+n=(sqrt(L1/L2))//equivalent turns ratio
+CT=(8+(2/n^2))*1e-12//total primary capacitance
+RL=25*10^3//load resistance reflected to the primary
+wo=(sqrt(L1*CT))^-1//resonant frequency
+Q=RL/(wo*L1)//quality point
+mprintf('the resonant frequency is %3.2e rad/s \n Q = %f',wo,Q)
diff --git a/1583/CH4/EX4.4/Result_of_Chapter_4_Ex4_4.jpg b/1583/CH4/EX4.4/Result_of_Chapter_4_Ex4_4.jpg
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index 000000000..d3f2fe022
--- /dev/null
+++ b/1583/CH4/EX4.4/Result_of_Chapter_4_Ex4_4.jpg
diff --git a/1583/CH4/EX4.6/FSNT_Ex_4_6.sce b/1583/CH4/EX4.6/FSNT_Ex_4_6.sce
new file mode 100755
index 000000000..5784c48a6
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+++ b/1583/CH4/EX4.6/FSNT_Ex_4_6.sce
@@ -0,0 +1,14 @@
+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.6 paga no 130
+//given
+Rs=10//source resistance
+L=0.2*10^-6//inductor 
+f=20*10^6//given frequency
+XL=(2*%pi*f*L)//inductive reactance
+Rp=50//input impedance
+Xs=sqrt(Rp*Rs-Rs^2)//series reactance
+Xcs=5.1//series capacitive reactance
+CS=(2*%pi*f*Xcs)^-1//series capacitance
+Xp=(Rs^2+Xs^2)/Xs//equivalent parallel reactance
+mprintf('the value of series reactance is j%f ohm \n the value equivalent parallel reactance is j%f ohm ',Xs,Xp)
diff --git a/1583/CH4/EX4.6/Result_of_Chapter_4_Ex4_6.jpg b/1583/CH4/EX4.6/Result_of_Chapter_4_Ex4_6.jpg
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index 000000000..5afe312a7
--- /dev/null
+++ b/1583/CH4/EX4.6/Result_of_Chapter_4_Ex4_6.jpg
diff --git a/1583/CH4/EX4.7/FSNT_Ex_4_7.sce b/1583/CH4/EX4.7/FSNT_Ex_4_7.sce
new file mode 100755
index 000000000..dcab41537
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+++ b/1583/CH4/EX4.7/FSNT_Ex_4_7.sce
@@ -0,0 +1,8 @@
+clc
+//Chapter 4:Frequency selective networks and transformers
+//example 4.7 page no 132
+//given
+Rs=50//series resistance
+Rp=100//parallel resistance
+Xp=sqrt(Rs*Rp^2/(Rp-Rs))//equivalent parallel reactance
+disp(Xp,'the equivalent parallel reactance in ohm is ')
diff --git a/1583/CH4/EX4.7/Result_of_Chapter_4_Ex4_7.jpg b/1583/CH4/EX4.7/Result_of_Chapter_4_Ex4_7.jpg
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index 000000000..d67b9fd03
--- /dev/null
+++ b/1583/CH4/EX4.7/Result_of_Chapter_4_Ex4_7.jpg