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//CHAPTER 8- DIRECT CURRENT MACHINES
//Example 31
disp("CHAPTER 8");
disp("EXAMPLE 31");
//VARIABLE INITIALIZATION
r_a=0.1; //combined resistance of armature & field resistance in Ohms
v_t=230; //in Volts
I_a1=100; //in Amperes
N1=1000; //in rpm
I_a2=200; //in Amperes
ratio=1.2; //ratio of Φ2:Φ1=1.2
//SOLUTION
E_b1=v_t-(I_a1*r_a); //numerator of LHS according to the book
E_b2=v_t-(I_a2*r_a); //denominator of LHS according to the book
N2=(E_b2/E_b1)*(1/ratio)*N1;
N2=round(N2); //to round off the value
disp(sprintf("The new speed of the armature is %d rpm",N2));
//END
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