8 files changed, 110 insertions, 0 deletions
diff --git a/3890/CH5/EX5.1/Ex5_1.png b/3890/CH5/EX5.1/Ex5_1.png
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+++ b/3890/CH5/EX5.1/Ex5_1.png
diff --git a/3890/CH5/EX5.1/Ex5_1.sce b/3890/CH5/EX5.1/Ex5_1.sce
new file mode 100644
index 000000000..f2fc77c29
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+//Electric machines and power systems by Syed A Nasar
+//Publisher:TataMcgraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 5.1
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+Q=2500;          //power in KVA
+v=6600;          //3phase voltage in v
+pf=-0.8;                 //power factor
+Xs=10.4;                //syncronous reactance  in ohm
+ra=0.071;             //armature resistance in ohm
+
+
+th=acosd(pf);
+vt=v/(3^(1/2));
+Ia=Q*10^3/((3^(1/2))*v);
+t=cosd(th)-%i*sind(th);
+Iad=Ia*t;
+v1=Iad*Xs;
+v0=vt+%i*v1;
+Reg=(abs(v0)-vt)/vt*100;
+
+printf('The regulation is %f ',Reg)
diff --git a/3890/CH5/EX5.2/Ex5_2.png b/3890/CH5/EX5.2/Ex5_2.png
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index 000000000..374743351
--- /dev/null
+++ b/3890/CH5/EX5.2/Ex5_2.png
diff --git a/3890/CH5/EX5.2/Ex5_2.sce b/3890/CH5/EX5.2/Ex5_2.sce
new file mode 100644
index 000000000..2c41de337
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+++ b/3890/CH5/EX5.2/Ex5_2.sce
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+//Electric machines and power systems by Syed A Nasar
+//Publisher:TataMcgraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 5.2
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+Q=2500;          //power in KVA
+v=6600;          //3phase voltage in v
+pf=0.8;                 //power factor
+Xs=10.4;                //syncronous reactance  in ohm
+ra=0.071;             //armature resistance in ohm
+
+th=acosd(pf);
+vt=v/(3^(1/2));
+Ia=Q*10^3/((3^(1/2))*v);
+t=cosd(th)+%i*sind(th);
+Iad=Ia*t;
+v1=Iad*Xs;
+v0=vt+%i*v1;
+Reg=(abs(v0)-vt)/vt*100;
+
+printf('The regulation is %f ',Reg)
+
+
diff --git a/3890/CH5/EX5.3/Ex5_3.png b/3890/CH5/EX5.3/Ex5_3.png
new file mode 100644
index 000000000..3a4890813
--- /dev/null
+++ b/3890/CH5/EX5.3/Ex5_3.png
diff --git a/3890/CH5/EX5.3/Ex5_3.sce b/3890/CH5/EX5.3/Ex5_3.sce
new file mode 100644
index 000000000..e80d8332f
--- /dev/null
+++ b/3890/CH5/EX5.3/Ex5_3.sce
@@ -0,0 +1,28 @@
+//Electric machines and power systems by Syed A Nasar
+//Publisher:Tata McGraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 5.3
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+I=50;          //current in A
+pf=0.707;      //power factor
+v=220;          //voltage in v
+xs=1.27;         //synchronous reactance/phase in ohm
+pm=33*10^3;          //power developed by the motor in w
+pa=30;             //power angle
+phia=30;            //phase angle
+
+v1=220/3^(1/2);
+pd=(pm*10^3)/3;
+v0=(pd*xs)/(v1*sin(pa));
+Ia=v1/xs;
+kvar=3^(1/2)*v*Ia*sind(phia)/10^3;
+Il=I-Ia;
+Phi=atan(.122);
+Pfn=cos(Phi);
+
+printf('KVAR is %f\n',kvar)
+printf('power factor of the motor is %f',Pfn)
diff --git a/3890/CH5/EX5.5/Ex5_5.png b/3890/CH5/EX5.5/Ex5_5.png
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index 000000000..ab19649a1
--- /dev/null
+++ b/3890/CH5/EX5.5/Ex5_5.png
diff --git a/3890/CH5/EX5.5/Ex5_5.sce b/3890/CH5/EX5.5/Ex5_5.sce
new file mode 100644
index 000000000..f62171d85
--- /dev/null
+++ b/3890/CH5/EX5.5/Ex5_5.sce
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+//Electric machines and power systems by Syed A Nasar
+//Publisher:TataMcgraw Hill
+//Year: 2002 ; Edition - 7 
+//Example 5.5
+//Scilab Version : 6.0.0    ; OS : Windows
+
+clc;
+clear;
+
+Q=20;         //power in KVA
+v=220;        //voltage in v
+pf=0.707;      //lagging power factor
+Ra=0.5;        //armature resistance in ohms
+xd=4;         //d-axis reactance in ohms
+xq=2;         //q-axis reactance in ohms
+
+vt=v/3^(1/2);
+Ia=Q*10^3/(3^(1/2)*v);
+phi=acosd(pf);
+td=(Ia*xq*cosd(phi))/(vt+Ia*xq*sind(phi));
+d=atand(td);
+Id=Ia*sind(phi+d);
+v1=Id*xd;
+v0=vt*cosd(d)+Id*xd;
+reg=(v0-vt)*100/vt;
+
+printf('The percentage regulation is %f in percentage',reg)
+
+