12 files changed, 255 insertions, 0 deletions
diff --git a/3574/CH12/EX12.1/EX12_1.png b/3574/CH12/EX12.1/EX12_1.png
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index 000000000..153e7bb9b
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+++ b/3574/CH12/EX12.1/EX12_1.png
diff --git a/3574/CH12/EX12.1/EX12_1.sce b/3574/CH12/EX12.1/EX12_1.sce
new file mode 100644
index 000000000..a0b2fe1ef
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+// Example 12.1
+// Determine (a) Field circuit resistance (b) Field rheostat setting that will 
+// provide no load voltage of 140V (c) Armature voltage if the rheostat is set 
+// to 14.23 ohm (d) Field rheostat setting that will cause critical resistance 
+// (e) Armature voltage at 80 percent rated speed (f) Rheostat setting required 
+// to obtain no load armature voltage of 140V if shunt field is separately 
+// excited from a 120V DC source
+// Page No. 479
+
+clc;
+clear;
+close;
+
+// Given data
+Ea=156;               // No load voltage
+If=4.7;               // Shunt field current
+If140=2.35;           // New field current at Ea=140V
+Eanew=140;            // No load voltage
+Ifnew=3.2;            // Field current corresponding to no load voltage
+Ea1=0;                // First arbitrary voltage
+Ea2=100;              // Second arbitrary voltage
+Vf=120;
+V=130;                // Intersection of I1 and I2
+Rrheonew=14.42;       // Rheostat set to new settings
+Va=116;               // Intersection of field resistance line with the low 
+                      // speed magnetization curve
+
+
+
+//(a) Field circuit resistance
+Rf=Ea/If;      // Field circuit resistance
+
+// (b) Field rheostat setting that will provide no load voltage of 140V
+Rrheo=(Eanew/Ifnew)-Rf;
+
+//(c) Armature voltage if the rheostat is set to 14.23 ohm
+Rnew=Rf+Rrheonew;      // New field resistance
+If1=Ea1/(Rf+Rrheo);    // Field current corresponding to first arbitrary voltage
+If2=Ea2/(Rf+Rrheo);    // Field current corresponding to second arbitrary voltage
+
+// (d) Field rheostat setting that will cause critical resistance 
+Rcr=Eanew/If140;         // Critical resistance
+
+// (e) Armature voltage at 80 percent rated speed
+// Ea80=0.80*Ea;
+Ea80=116;
+
+//(f) Rheostat setting required to obtain no load armature voltage of 140V if 
+// shunt field is separately excited from a 120V DC source
+Rrheo1=(Vf/Ifnew)-Rf;   
+
+// Display result on command window
+printf("\n Field circuit resistance = %0.2f Ohm",Rf);
+printf("\n Field rheostat setting that will provide no load voltage of 140V = %0.2f Ohm ",Rrheo);
+printf("\n Armature voltage if the rheostat is set to 14.23 ohm = %0.0f V ",V);
+printf("\n Field rheostat setting that will cause critical resistance = %0.1f Ohm ",Rcr);
+printf("\n Armature voltage at 80 percent rated speed (V)= %0.0f  ",Ea80);
+printf("\n Rheostat setting required = %0.2f Ohm ",Rrheo1);
+
diff --git a/3574/CH12/EX12.2/EX12_2.png b/3574/CH12/EX12.2/EX12_2.png
new file mode 100644
index 000000000..cb9056931
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+++ b/3574/CH12/EX12.2/EX12_2.png
diff --git a/3574/CH12/EX12.2/EX12_2.sce b/3574/CH12/EX12.2/EX12_2.sce
new file mode 100644
index 000000000..389460811
--- /dev/null
+++ b/3574/CH12/EX12.2/EX12_2.sce
@@ -0,0 +1,41 @@
+// Example 12.2
+// Computation of (a) No load voltage (b) Voltage regulation
+// (c) Resistance setting of rheostat necessary to obtain rated voltage 
+// at rated conditions
+// Page No. 487
+
+clc;
+clear;
+close;
+
+// Given data
+P=300000;               // Shunt generator power rating
+VT=240;                 // Shunt generator voltage rating
+Ra=0.00234;             // Armature winding resistance
+RIP=0.00080;            // Resistance of interpole winding
+Fnet=5100;              // Net mmf
+Vnl=255;                // No load voltage
+Vrated=240;             // Rated voltage
+Nf=1020;                // Turns per pole
+Vf=120;                 // Source that separately excites the generator
+If=5.69;
+Rf=18.1;
+
+// (a) No load voltage
+Ia=P/VT;               // Armature current
+Ea=VT+Ia*(Ra+RIP);     // Armature emf
+Ff=Fnet/(1-0.121);
+
+
+// (b) Voltage regulation
+VR=(Vnl-Vrated)*100/Vrated; 
+
+// (c) Resistance setting of rheostat necessary to obtain rated voltage at rated conditions
+If=Ff/Nf;
+Rrheo=(Vf/If)-Rf; // Rheostat setting
+
+
+// Display result on command window
+printf("\n No load voltage = %0.0f V ",Vnl);
+printf("\n Voltage regulation = %0.2f Percent ",VR);
+printf("\n Resistance setting of rheostat necessary = %0.0f Ohm",Rrheo);
diff --git a/3574/CH12/EX12.3/EX12_3.png b/3574/CH12/EX12.3/EX12_3.png
new file mode 100644
index 000000000..1d916e875
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+++ b/3574/CH12/EX12.3/EX12_3.png
diff --git a/3574/CH12/EX12.3/EX12_3.sce b/3574/CH12/EX12.3/EX12_3.sce
new file mode 100644
index 000000000..f235ab7fa
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+++ b/3574/CH12/EX12.3/EX12_3.sce
@@ -0,0 +1,41 @@
+// Example 12.3
+// Computation of (a) Induced emf at rated load (b) No load voltage
+// (c) Voltage regulation (d) What is the type of compounding?
+// Page No. 492
+
+clc;
+clear;
+close;
+
+// Given data
+Pload=320000;               // Shunt generator power rating
+Vrated=250;                 // Shunt generator voltage rating
+Rf=20.2;                    // Shunt resistance
+Rrheo=7.70;                 // Shunt field rheostat value
+If=8.96;                    // Field current
+Iload=1280;                 // Load current
+Ra=0.00817;                 // Armature resistance
+Rip=0.00238;                // Resistance of interpole winding
+Rse=0.00109;                // Resistance of series winding
+Nf=502;                     // Turns per pole
+VNL=225;                    // No load voltage
+
+// (a) Induced emf at rated load
+Iload=Pload/Vrated;          // Load current
+If=Vrated/(Rf+Rrheo);        // Field current
+Ia=If+Iload;                 // Armature current
+Racir=Ra+Rip+Rse;
+Ea=Vrated+Ia*Racir;
+
+// (b) No load voltage
+Ff=Nf*If; 
+
+// (c) Voltage regulation
+VR=(VNL-Vrated)*100/Vrated; 
+
+
+// Display result on command window
+printf("\n Induced emf at rated load = %0.1f V ",Ea);
+printf("\n No load voltage = %0.0f V ",VNL);
+printf("\n Voltage regulation = %0.0f Percent ",VR);
+printf("\n The machine is overcompounded ");
diff --git a/3574/CH12/EX12.4/EX12_4.png b/3574/CH12/EX12.4/EX12_4.png
new file mode 100644
index 000000000..8f997df92
--- /dev/null
+++ b/3574/CH12/EX12.4/EX12_4.png
diff --git a/3574/CH12/EX12.4/EX12_4.sce b/3574/CH12/EX12.4/EX12_4.sce
new file mode 100644
index 000000000..4639df232
--- /dev/null
+++ b/3574/CH12/EX12.4/EX12_4.sce
@@ -0,0 +1,33 @@
+// Example 12.4
+// Computation of (a) Required resistance of a noninductive diverter that will 
+// bypass 27 percent of the total armature current(b) Power rating of the 
+// diverter
+// Page No. 494
+
+clc;
+clear;
+close;
+
+// Given data
+Rs=0.00306;               // Shunt generator resistance rating
+Is=0.73;                  // Shunt generator current rating
+Id1=0.27;                 // Armature winding resistance
+Pload=170000;             // Load of power
+VT=250;                   // Shunt generator voltage rating
+Id2=680;                  // No load voltage
+Rd=0.27;                  // Resistance drop
+
+// (a) Required resistance of a noninductive diverter that will bypass 
+// 27 percent of the total armature current
+Rd=Rs*Is/Id1;
+
+
+// (b) Power rating of the diverter
+Ia=Pload/VT; 
+Pd=((Id1*Id2)^2)*Rd;
+
+
+
+//Display result on command window
+printf("\n Required resistance of a noninductive diverter = %0.5f Ohm ",Rd);
+printf("\n Power rating of the diverter = %0.0f W ",Pd);
diff --git a/3574/CH12/EX12.5/EX12_5.png b/3574/CH12/EX12.5/EX12_5.png
new file mode 100644
index 000000000..6c2680688
--- /dev/null
+++ b/3574/CH12/EX12.5/EX12_5.png
diff --git a/3574/CH12/EX12.5/EX12_5.sce b/3574/CH12/EX12.5/EX12_5.sce
new file mode 100644
index 000000000..e4bad02c8
--- /dev/null
+++ b/3574/CH12/EX12.5/EX12_5.sce
@@ -0,0 +1,39 @@
+// Example 12.5
+// Computation of (a) New bus voltage (b) Current supplied by each generator
+//Page No. 500
+
+clc;
+clear;
+close;
+
+// Given data
+p1=300000;               // Rated power in generator A
+p2=400000;               // Rated power in generator B
+v=250;                   // Rated voltage in machine
+p3=350000;               // Rated power in generator C
+Ibnew=2500;
+
+// (a) New bus voltage
+
+IArated=p1/v;               // Rated current in generator A
+IBrated=p2/v;               // Rated current in generator B
+IBorig=p3/v;                // Original bus current
+IbDelta=Ibnew-IBorig;       // Current difference
+DelVbus=IbDelta/(160+128);  // Voltage difference
+
+
+// (b) Current supplied by each generator
+DelIA=160*DelVbus;          // Generator A current difference
+DelIB=128*DelVbus;          // Generator A current difference
+Vbus=v-DelVbus;             // Voltage across the bus
+IA=700+DelIA;               // Current in generator A
+IB=700+DelIB;               // Current in generator B
+
+Loading= (IA-IArated)*100/IArated;
+
+
+// Display result on command window
+printf("\n New bus voltage = %0.2f V ",DelVbus);
+printf("\n Current supplied by generator A = %0.0f A ",IA);
+printf("\n Current supplied by generator B = %0.0f A ",IB);
+printf("\n Macine A is overloaded by %0.1f Percent ",Loading);
diff --git a/3574/CH12/EX12.6/EX12_6.png b/3574/CH12/EX12.6/EX12_6.png
new file mode 100644
index 000000000..2539bbea2
--- /dev/null
+++ b/3574/CH12/EX12.6/EX12_6.png
diff --git a/3574/CH12/EX12.6/EX12_6.sce b/3574/CH12/EX12.6/EX12_6.sce
new file mode 100644
index 000000000..bd459ff94
--- /dev/null
+++ b/3574/CH12/EX12.6/EX12_6.sce
@@ -0,0 +1,42 @@
+// Example 12.6
+// Determine (a) The increment increase in load on each machine if an 
+// additional 400 A load is connected to the bus (b) Current carried 
+// by each machine
+// Page No. 502
+
+clc;
+clear;
+close;
+
+// Given data
+p1=100000;                // Rated power in generator A
+p2=300000;                // Rated power in generator B
+v=250;                    // Rated voltage in machine
+p3=30000;                 // Rated power in generator C
+Ibnew=400;                // New bus current
+I1=200;
+I2=500;
+
+// (a) The increment increase in load on each machine if an additional 400 A 
+// load is connected to the bus
+
+IArated=p1/v;                      // Rated current in generator A
+IBrated=p2/v;                      // Rated current in generator B
+Ib=p3/v;                           // Original bus current
+DelVbus=Ibnew/(40+120);            // Change in bus current
+DelIA=40*DelVbus;
+DelIB=120*DelVbus;
+
+
+// (b) Current carried by each machine
+
+IA=I1+DelIA;                // Current in generator A
+IB=I2+DelIB;                // Current in generator B
+
+
+// Display result on command window
+printf("\n The increment increase in load on machine A = %0.0f A ",DelIA);
+printf("\n The increment increase in load on machine B = %0.0f A ",DelIB);
+printf("\n Current carried by machine A = %0.0f A ",IA);
+printf("\n Current carried by machine B = %0.0f A ",IB);
+