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diff --git a/3472/CH42/EX42.2/Example42_2.sce b/3472/CH42/EX42.2/Example42_2.sce
new file mode 100644
index 000000000..a5b368b0a
--- /dev/null
+++ b/3472/CH42/EX42.2/Example42_2.sce
@@ -0,0 +1,34 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.2 :

+// Page number 753

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+lumens = 800.0        // Flux emitted by a lamp(lumens)

+cp = 100.0            // cp of a lamp

+d = 2.0               // Distance b/w plane surface & lamp(m)

+theta_ii = 45.0       // Inclined surface(°)

+theta_iii = 90.0      // Parallel rays(°)

+

+// Calculations

+// Case(a)

+mscp = lumens/(4.0*%pi)            // mscp of lamp

+// Case(b)

+I_i = cp/d**2                      // Illumination on the surface when it is normal(lux)

+I_ii = cp/d**2*cosd(theta_ii)      // Illumination on the surface when it is inclined to 45°(lux)

+I_iii = cp/d**2*cosd(theta_iii)    // Illumination on the surface when it is parallel to rays(lux)

+

+// Results

+disp("PART IV - EXAMPLE : 4.2 : SOLUTION :-")

+printf("\nCase(a): mscp of the lamp, mscp = %.f ", mscp)

+printf("\nCase(b): Case(i)  : Illumination on the surface when it is normal, I = %.f lux", I_i)

+printf("\n         Case(ii) : Illumination on the surface when it is inclined to 45°, I = %.3f lux", I_ii)

+printf("\n         Case(iii): Illumination on the surface when it is parallel to rays, I = %.f lux\n", abs(I_iii))

+printf("\nNOTE: ERROR: Calculation mistake in case(a) in textbook solution")

diff --git a/3472/CH42/EX42.3/Example42_3.sce b/3472/CH42/EX42.3/Example42_3.sce
new file mode 100644
index 000000000..f33a8cecd
--- /dev/null
+++ b/3472/CH42/EX42.3/Example42_3.sce
@@ -0,0 +1,37 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.3 :

+// Page number 753-754

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+cp = 200.0        // cp of a lamp

+per = 0.6         // Reflector directing light

+D = 10.0          // Diameter(m)

+h = 6.0           // Height at which lamp is hung(m)

+

+// Calculations

+flux = cp*4*%pi                             // Flux(lumens)

+I_i = cp/h**2                               // Illumination at the centre without reflector(lux)

+d = (h**2+(D/2)**2)**0.5                    // (m)

+I_without = (cp/h**2)*(h/d)                 // Illumination at the edge without reflector(lux)

+I_with = cp*4*%pi*per/(25*%pi)              // Illumination at the edge with reflector(lux)

+theta = acosd(h/d)                          // θ(°)

+w = 2.0*%pi*(1-cosd(theta/2))               // ω(steradian)

+phi = cp*w                                  // Φ(lumens)

+I_avg = phi/(25*%pi)                        // Average illumination over the area without reflector(lux)

+

+// Results

+disp("PART IV - EXAMPLE : 4.3 : SOLUTION :-")

+printf("\nCase(i) : Illumination at the centre without reflector = %.2f lux", I_i)

+printf("\n          Illumination at the centre with reflector = %.1f lux", I_with)

+printf("\nCase(ii): Illumination at the edge of the surface without reflector = %.2f lux", I_without)

+printf("\n          Illumination at the edge of the surface with reflector = %.1f lux", I_with)

+printf("\nAverage illumination over the area without the reflector, I  = %.3f lux\n", I_avg)

+printf("\nNOTE: ERROR: Slight calculation mistake & more approximation in textbook solution")

diff --git a/3472/CH42/EX42.5/Example42_5.sce b/3472/CH42/EX42.5/Example42_5.sce
new file mode 100644
index 000000000..e0bd6a1ac
--- /dev/null
+++ b/3472/CH42/EX42.5/Example42_5.sce
@@ -0,0 +1,28 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.5 :

+// Page number 754

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+flux = 900.0       // Lamp emitting light(lumens)

+D = 30.5           // Diameter of globe(cm)

+B = 250.0*10**-3   // Uniform brightness(Ambert)

+

+// Calculations

+cp = %pi/4*D**2*(B/%pi)            // Candle power

+flux_emit = cp*4*%pi               // Flux emitted by globe(lumens)

+flux_abs = flux-flux_emit          // Flux absorbed by globe(lumens)

+light_abs_per = flux_abs/flux*100  // Light absorbed(%)

+

+// Results

+disp("PART IV - EXAMPLE : 4.5 : SOLUTION :-")

+printf("\ncp of the globe = %.f ", cp)

+printf("\nPercentage of light emitted by lamp that is absorbed by the globe = %.1f percent\n", light_abs_per)

+printf("\nNOTE: Changes in the obtained answer from that of textbook is due to more precision here & approximation in textbook solution")

diff --git a/3472/CH42/EX42.6/Ex42_6.png b/3472/CH42/EX42.6/Ex42_6.png
new file mode 100644
index 000000000..bdc30ba94
--- /dev/null
+++ b/3472/CH42/EX42.6/Ex42_6.png
diff --git a/3472/CH42/EX42.6/Example42_6.sce b/3472/CH42/EX42.6/Example42_6.sce
new file mode 100644
index 000000000..f28dfd28f
--- /dev/null
+++ b/3472/CH42/EX42.6/Example42_6.sce
@@ -0,0 +1,64 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.6 :

+// Page number 754-755

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+cp_0 = 500.0      // Candle power

+theta_0 = 0.0     // θ(°)

+cp_1 = 560.0      // Candle power

+theta_1 = 10.0    // θ(°)

+cp_2 = 600.0      // Candle power

+theta_2 = 20.0    // θ(°)

+cp_3 = 520.0      // Candle power

+theta_3 = 30.0    // θ(°)

+cp_4 = 400.0      // Candle power

+theta_4 = 40.0    // θ(°)

+cp_5 = 300.0      // Candle power

+theta_5 = 50.0    // θ(°)

+cp_6 = 150.0      // Candle power

+theta_6 = 60.0    // θ(°)

+cp_7 = 50.0       // Candle power

+theta_7 = 70.0    // θ(°)

+h = 6.0           // Height of lamp(m)

+

+// Calculations

+I_0 = cp_0/h**2*(cosd(theta_0))**3    // Illumination(lux)

+l_0 = h*tand(theta_0)                 // Distance(m)

+I_1 = cp_1/h**2*(cosd(theta_1))**3    // Illumination(lux)

+l_1 = h*tand(theta_1)                 // Distance(m)

+I_2 = cp_2/h**2*(cosd(theta_2))**3    // Illumination(lux)

+l_2 = h*tand(theta_2)                 // Distance(m)

+I_3 = cp_3/h**2*(cosd(theta_3))**3    // Illumination(lux)

+l_3 = h*tand(theta_3)                 // Distance(m)

+I_4 = cp_4/h**2*(cosd(theta_4))**3    // Illumination(lux)

+l_4 = h*tand(theta_4)                 // Distance(m)

+I_5 = cp_5/h**2*(cosd(theta_5))**3    // Illumination(lux)

+l_5 = h*tand(theta_5)                 // Distance(m)

+I_6 = cp_6/h**2*(cosd(theta_6))**3    // Illumination(lux)

+l_6 = h*tand(theta_6)                 // Distance(m)

+I_7 = cp_7/h**2*(cosd(theta_7))**3    // Illumination(lux)

+l_7 = h*tand(theta_7)                 // Distance(m)

+l = [-l_7,-l_6,-l_5,-l_4,-l_3,-l_2,-l_1,l_0,l_0,l_1,l_2,l_3,l_4,l_5,l_6,l_7]

+I = [I_7,I_6,I_5,I_4,I_3,I_2,I_1,I_0,I_0,I_1,I_2,I_3,I_4,I_5,I_6,I_7]

+a = gca() ;

+a.thickness = 2                                       // sets thickness of plot

+plot(l,I,'ro-')                                       // Plot of illumination curve

+x = [0,0,0,0,0,0]

+y = [0,5,10,11,14,16]

+plot(x,y)                                             // Plot of straight line

+a.x_label.text = 'Distance(metres)'                   // labels x-axis

+a.y_label.text = 'Illumination(flux)'                 // labels y-axis

+xtitle("Fig E4.4 . Illumination on a horizontal line below the lamp") 

+xset('thickness',2)                                   // sets thickness of axes

+

+// Results

+disp("PART IV - EXAMPLE : 4.6 : SOLUTION :-")

+printf("\nThe curve showing illumination on a horizontal line below lamp is represented in Figure E4.4")

diff --git a/3472/CH42/EX42.7/Example42_7.sce b/3472/CH42/EX42.7/Example42_7.sce
new file mode 100644
index 000000000..749f4853e
--- /dev/null
+++ b/3472/CH42/EX42.7/Example42_7.sce
@@ -0,0 +1,39 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.7 :

+// Page number 755

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+d = 9.15       // Lamp space(m)

+h = 4.575      // Height(m)

+P = 100.0      // Power(candle)

+

+// Calculations

+theta_3_max = 0                                                                          // θ(°)

+cos_theta_3_max_cubic = cosd(theta_3_max)**3

+theta_4_max = atand(2)                                                                   // θ(°)

+cos_theta_4_max_cubic = cosd(theta_4_max)**3

+theta_5_max = atand(4)                                                                   // θ(°)

+cos_theta_5_max_cubic = cosd(theta_5_max)**3

+theta_6_max = atand(6)                                                                   // θ(°)

+cos_theta_6_max_cubic = cosd(theta_6_max)**3

+I_max = P/h**2*(cos_theta_3_max_cubic+2*cos_theta_4_max_cubic+2*cos_theta_5_max_cubic+2*cos_theta_6_max_cubic)   // Max illumination(lux)

+theta_4_min = atand(1)                                                                   // θ(°)

+cos_theta_4_min_cubic = cosd(theta_4_min)**3

+theta_5_min = atand(3)                                                                   // θ(°)

+cos_theta_5_min_cubic = cosd(theta_5_min)**3

+theta_6_min = atand(5)                                                                   // θ(°)

+cos_theta_6_min_cubic = cosd(theta_6_min)**3

+I_min = P/h**2*2*(cos_theta_4_min_cubic+cos_theta_5_min_cubic+cos_theta_6_min_cubic)     // Minimum illumination(lux)

+

+// Results

+disp("PART IV - EXAMPLE : 4.7 : SOLUTION :-")

+printf("\nMaximum illumination on the floor along the centre line = %.2f lux", I_max)

+printf("\nMinimum illumination on the floor along the centre line = %.2f lux", I_min)

diff --git a/3472/CH42/EX42.8/Example42_8.sce b/3472/CH42/EX42.8/Example42_8.sce
new file mode 100644
index 000000000..f2f4f675b
--- /dev/null
+++ b/3472/CH42/EX42.8/Example42_8.sce
@@ -0,0 +1,30 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.8 :

+// Page number 758

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+b = 15.25     // Breadth of workshop(m)

+l = 36.6      // Length of workshop(m)

+no = 20.0     // Number of lamps

+P = 500.0     // Power of each lamp(W)

+n = 15.0      // Luminous efficiency of each lamp(lumens/watt)

+df = 0.7      // Depreciation factor

+cou = 0.5     // Co-efficient of utilization

+

+// Calculations

+lumen_lamp = no*P*n                // Lamp lumens

+lumen_plane = lumen_lamp*df*cou    // Lumens on the working plane

+I = lumen_plane/(l*b)              // Illumination(lm/sq.m)

+

+// Results

+disp("PART IV - EXAMPLE : 4.8 : SOLUTION :-")

+printf("\nIllumination on the working plane = %.1f lm per sq.m\n", I)

+printf("\nNOTE: ERROR: The breadth should be 15.25m but mentioned as 5.25m in textbook statement")

diff --git a/3472/CH42/EX42.9/Example42_9.sce b/3472/CH42/EX42.9/Example42_9.sce
new file mode 100644
index 000000000..cdca63f25
--- /dev/null
+++ b/3472/CH42/EX42.9/Example42_9.sce
@@ -0,0 +1,39 @@
+// A Texbook on POWER SYSTEM ENGINEERING

+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar

+// DHANPAT RAI & Co.

+// SECOND EDITION 

+

+// PART IV : UTILIZATION AND TRACTION

+// CHAPTER 4: ILLUMINATION

+

+// EXAMPLE : 4.9 :

+// Page number 758-759

+clear ; clc ; close ; // Clear the work space and console

+

+// Given data

+b = 27.45      // Breadth of hall(m)

+l = 45.75      // Length of hall(m)

+I_avg = 108.0  // Average illumination(lumens/sq.m)

+h = 0.75       // Height(m)

+cou = 0.35     // Co-efficient of utilization

+pf = 0.9       // Pereciation factor

+P_fl = 80.0    // Fluorescent lamp power(W)

+n_100 = 13.4   // Luminous efficiency for 100W filament lamp(lumens/watt)

+n_200 = 14.4   // Luminous efficiency for 200W filament lamp(lumens/watt)

+n_80 = 30.0    // Luminous efficiency for 80W fluorescent lamp(lumens/watt)

+

+// Calculations

+area = b*l                                   // Area to be illuminated(Sq.m)

+I_total = area*I_avg                         // Total illumination on working plane(lumens)

+gross_lumen = I_total/(cou*pf)               // Gross lumens required

+P_required = gross_lumen/n_200               // Power required for illumination(W)

+P_required_kW = P_required/1000              // Power required for illumination(kW)

+no_lamp = P_required/200                     // Number of lamps

+P_required_new = gross_lumen/n_80            // Power required when fluorescent lamp used(W)

+P_required_new_kW = P_required_new/1000      // Power required when fluorescent lamp used(kW)

+P_saving = P_required_kW-P_required_new_kW   // Saving in power(kW)

+

+// Results

+disp("PART IV - EXAMPLE : 4.9 : SOLUTION :-")

+printf("\nSuitable scheme: Whole area divided into %.f rectangles & 200-watt fitting is suspended at centre of each rectangle", no_lamp)

+printf("\nSaving in power consumption = %.1f kW", P_saving)