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+//Example 4_7
+clc;funcprot(0);
+//Given data
+Q=400;// m^3/sec
+H=45;// m
+n_t=0.90;// The turbine efficiency
+N=250;// r.p.m
+
+//Calculation
+w=1000*9.81;// N
+P_t=(w*Q*H*n_t)/(1000);// kW
+//(a)
+N_sf=200;// Specific speed
+P=((N_sf*H^(5/4))/N)^2;// kW
+f_n=(P_t/P);// Number of francis turbine required
+// (b)
+N_sk=600;// Specific speed
+P=((N_sk*H^(5/4))/N)^2;// kW
+k_n=(P_t/P);// Number of kaplan turbine required
+printf('\n Number of francis turbines=%0.0f \n Number of kaplan turbine used=%0.0f',f_n,k_n);
+if(f_n>k_n)
+    printf('\n The installation of kaplan turbine is more economical than francis turbine as number of units required is less.');
+else(k_n>f_n)
+    printf('\n The installation of francis turbine is more economical than kaplan turbine as number of units required is less.');
+end
+// The answer provided in the textbook is wrong