2 files changed, 44 insertions, 0 deletions
diff --git a/3802/CH7/EX7.7/Ex7_7.jpg b/3802/CH7/EX7.7/Ex7_7.jpg
new file mode 100644
index 000000000..96b2ca359
--- /dev/null
+++ b/3802/CH7/EX7.7/Ex7_7.jpg
diff --git a/3802/CH7/EX7.7/Ex7_7.sce b/3802/CH7/EX7.7/Ex7_7.sce
new file mode 100644
index 000000000..7b7c06762
--- /dev/null
+++ b/3802/CH7/EX7.7/Ex7_7.sce
@@ -0,0 +1,44 @@
+//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex7_7.sce
+clc;
+clear;
+KVA=50e3;
+
+printf("\n (a)")
+PF=0.7;
+iron_loss=430;             //primary power of transformer on open circuit test in watt is called iron loss
+copper_loss_FL=525;              //primary power of transformer on short circuit test in watt is called copper loss
+total_loss_FL=iron_loss+copper_loss_FL;
+eta_FL=(KVA*PF)/((KVA*PF)+total_loss_FL)*100;                 //full load efficiency
+printf("\n   Full load efficiency for 0.7 power factor=%2.2f percentage \n",eta_FL)
+copper_loss_HL=(0.5^2)*copper_loss_FL;
+total_loss_HL=iron_loss+copper_loss_HL;
+eta_HL=(KVA*PF*0.5)/((KVA*0.5*PF)+total_loss_HL)*100;
+printf("\n   Half load Efficiency  for 0.7 power factor=%2.2f percentage \n",eta_HL)
+
+printf("\n (b)")
+Vsc=124;                            //primary voltage on short circuit test in volts
+Isc=15.3;                           //primary current on short circuit test in amphere
+Psc=525;                           //primary power of transformer on open circuit test in watt
+pi_e=acosd(Psc/(Vsc*Isc));
+pi_2=acosd(PF);
+Voc=3300;
+voltage_regulation1=Vsc*cosd(pi_e-pi_2)/(Voc)*100;
+printf("\n   The voltage regulation for 0.7 lagging power factor=%1.1f percentage \n",voltage_regulation1)
+pi_2=-acosd(PF);
+voltage_regulation2=Vsc*cosd(pi_e-pi_2)/(Voc)*100;
+printf("\n   The voltage regulation for 0.7 leading power factor=%1.2f percentage \n",voltage_regulation2)
+
+printf("\n (c)")
+Voc=400;
+decrease_in_voltage=voltage_regulation1*Voc/100;
+Vs1=Voc-decrease_in_voltage;
+increase_in_voltage=voltage_regulation2*Voc/100;
+Vs2=Voc-increase_in_voltage;
+printf("\n   The secondary terminal voltage corresponding to 0.7 pf lagging=%3.1f V \n",Vs1)
+printf("\n   The secondary terminal voltage corresponding to 0.7 pf leading=%3.1f V \n",Vs2)
+