initial commit / add all books

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diff --git a/3826/CH2/EX2.11/Ex2_11.sce b/3826/CH2/EX2.11/Ex2_11.sce
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+//Example 2_11 page no:141

+clc;  

+//given

+speed1 = 37.5;//in km/h

+speed2 = 48.2;//in km/h

+tractive_effort = 4670;//in N

+flux_speed = 100 * speed1/speed2;

+//if current is reduced by 30% then new flux will from the magnetisation curve be 64%

+flux = 64;//in percentage

+speed = speed2*flux_speed/flux;

+disp(speed,"the speed at new flux will be(in km/h)");

+tractive_effort = tractive_effort * flux/70.7;//calculating new tractive effort

+disp(tractive_effort,"the new tractive effort at 100A will be(in N)");

+//the new tractive effort calculated is wrong in textbook. It is a calculation error

+

diff --git a/3826/CH2/EX2.12/Ex2_12.sce b/3826/CH2/EX2.12/Ex2_12.sce
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+//the examples are continuously numbered in textbook. This is the second example in chapter 2 as first example cannot be codded in scilab. 

+//Example 2_12 page no:146

+clc;

+//given

+weight = 391000;//in kg

+no_of_motor = 12;

+no_of_motors_parallel = 6;

+tot_tractive_effort = 171000;//in N

+line_voltage = 600;//in V

+avg_current = 380;//in A

+speed = 41.8//in km/h

+tot_res = 0.158;//in ohm

+acceleration = tot_tractive_effort / (0.2778*weight);

+time1 = speed/1.575;

+//in full series position

+back_emf_series = 300 - ( avg_current * tot_res);

+//in full parallel position

+back_emf_parallel = 600 - (avg_current * tot_res);

+speed_parallel = 41.8;

+speed_series = speed_parallel * back_emf_series/back_emf_parallel;

+time2 = speed_series / 1.575;

+time_parallel = time1 - time2;

+disp("Total Energy Supplied during starting period is (in Wh)")

+series = no_of_motors_parallel * line_voltage * avg_current * time2;

+series = series / 3600;//converting to watt-hour

+parallel = no_of_motor * line_voltage * avg_current * time_parallel;

+parallel = parallel / 3600;//converting to watt-hour

+disp(parallel+series);

+disp("Energy lost in starting resistances(in Wh)");

+series = no_of_motors_parallel * 0.5 * back_emf_series * avg_current * time_parallel;

+series = series / 3600;//converting to watt-hour

+parallel = no_of_motor * 0.5*300 * avg_current * time_parallel;

+parallel = parallel / 3600;//converting to watt-hour

+disp(parallel+series);

+disp("Energy lost in motor resistance(in Wh)");

+W = no_of_motor * avg_current^2 * tot_res * time1;

+W = W / 3600;//converting to watt-hour

+disp(W);

+KE = 0.5 * (time1/3600)*(tot_tractive_effort * speed * 1000/3600);

+disp(KE,"useful energy is (in Wh)");

+//the result vary slightly hence values are rounded off in textbook

+

diff --git a/3826/CH2/EX2.13/Ex2_13.sce b/3826/CH2/EX2.13/Ex2_13.sce
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+//Example 2_14 page no:188

+clc;

+//given

+mass = 136000;//in kg

+g = 9.81;

+up_gradient = 1/600;

+len = 1005;//in m

+V = 1500;

+comp_train_wg = mass * g * up_gradient;

+net_tractive_effort = 104500 - 6675;

+f = net_tractive_effort / (1.1* mass);

+quantity = 1/f;

+retarding_coasting = 4448/(1.1 * mass);

+area_current_curve = 21300*V/3600;

+energy_consumption = area_current_curve/(mass*len);

+disp(energy_consumption,"the energy consumption of motor-coach train is (in Wh/kg-m)");