initial commit / add all books

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+//Example 1_2 page no:23

+clc;

+//given

+//solving a sub part

+voltage = 500;//in v

+current = 32;//in A

+arm_res = 0.4;//in ohm

+fl_win_res = 250;//in ohm

+rpm = 450;

+field_current = 2;

+input_pow = (voltage*current)/1000;

+arm_current = current - field_current;

+//when running at 600rpm

+rpm1 = 600;

+k_phi = (voltage - 12)/rpm1;

+//when running at 450rpm

+R = -(k_phi*rpm-voltage)/arm_current;

+R = R - arm_res;

+disp("To decrease the speed to 450 rev/min");

+disp(R,"the resistance added with the armature is (in ohm)");

+disp(current,"the current is (in A)");

+disp(input_pow,"the kw-input taken from the supply is(in kW)");

+//solving b sub part

+disp("To increase the speed to 700 rev/min");

+flux_ratio = 600/700;

+res_added = (fl_win_res/flux_ratio)- fl_win_res;

+disp(res_added,"the resistance to be added is (in ohm)");

+arm_current = arm_current*(1/flux_ratio);

+fld_current = 1.25;

+tot_current = arm_current + fld_current;

+pow = tot_current * voltage/1000;

+disp(arm_current,"the armature current is (in A)");

+disp(fld_current,"the field current is (in A)");

+disp(tot_current,"the total current is (in A)");

+disp(pow,"the kw-input taken from the supply is(in kW)");

+//the resistance value is rounded off in text book so armature current, total current , input power vary slightly with text book