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+//CHAPTER 10- THREE-PHASE INDUCTION MACHINES
+//Example 2
+
+disp("CHAPTER 10");
+disp("EXAMPLE 2");
+
+//VARIABLE INITIALIZATION
+P=6;                           //number of poles
+f1=60;                         //frequency in Hertz
+N_r1=1140;                     //in rpm
+
+//SOLUTION
+N_s=(120*f1)/P; 
+s1=(N_s-N_r1)/N_s;             //slip at full load
+
+//solution (a)
+N_r2=0;
+s2=(N_s-N_r2)/N_s;
+disp(sprintf("(a) At standstill, the slip is %f %%",s2*100));
+if(s2>1)
+disp("Since the slip is greater than 100%, the motor operates as brake");
+end;
+if(s2<0)
+disp("Since the slip is negative, the motor operates as generator");
+end;
+f2=s2*f1;
+disp(sprintf("And the frequency is %d Hz",f2));
+if(f2<0)
+disp("Since frequency is negative, phase sequence of voltage induced in rotor winding is reversed");
+end;
+
+//solution (b) 
+N_r3=500;
+s3=(N_s-N_r3)/N_s;
+disp(sprintf("(b) At %d rpm, the slip is %f %%",N_r3,s3*100));
+if(s3>1)
+disp("Since the slip is greater than 100%, the motor operates as brake");
+end;
+if(s3<0)
+disp("Since the slip is negative, the motor operates as generator");
+end;
+f3=s3*f1;
+disp(sprintf("And the frequency is %d Hz",f3));
+if(f3<0)
+disp("Since frequency is negative, phase sequence of voltage induced in rotor winding is reversed");
+end;
+
+//solution (c)
+N_r4=500;
+s4=(N_s+N_r4)/N_s;              //as motor runs in opposite direction  
+disp(sprintf("(c) At %d rpm, the slip is %f %%",N_r4,s4*100));
+if(s4>1)
+disp("Since the slip is greater than 100%, the motor operates as brake");
+end;
+if(s4<0)
+disp("Since the slip is negative, the motor operates as generator");
+end;
+f4=s4*f1;
+disp(sprintf("And the frequency is %d Hz",f4));
+if(f4<0)
+disp("Since frequency is negative, phase sequence of voltage induced in rotor winding is reversed");
+end;
+
+//solution (d)
+N_r5=2000;
+s5=(N_s-N_r5)/N_s;
+disp(sprintf("(d) At %d rpm, the slip is %f %%",N_r5,s5*100));
+if(s5>1)
+disp("Since the slip is greater than 100%, the motor operates as brake");
+end;
+if(s5<0)
+disp("Since the slip is negative, the motor operates as generator");
+end;
+f5=s5*f1;
+disp(sprintf("And the frequency is %d Hz",f5));
+if(f5<0)
+disp("Since frequency is negative, phase sequence of voltage induced in rotor winding is reversed");
+end;
+
+//END