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author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
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committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /1445/CH10/EX10.12/ch10_ex_12.sce | |
parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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diff --git a/1445/CH10/EX10.12/ch10_ex_12.sce b/1445/CH10/EX10.12/ch10_ex_12.sce new file mode 100644 index 000000000..c2ab1d370 --- /dev/null +++ b/1445/CH10/EX10.12/ch10_ex_12.sce @@ -0,0 +1,43 @@ +//CHAPTER 10- THREE-PHASE INDUCTION MACHINES +//Example 12 + +disp("CHAPTER 10"); +disp("EXAMPLE 12"); + +//VARIABLE INITIALIZATION +v=440; //in Volts +I=1200; //in Amperes +eff=0.85; //full load efficiency +pow_fact=0.8; //full load power factor + +//SOLUTION + +//solution (a) +I_fl1=I/5; //starting current at rated voltage is 5 times the rated full-load current +p1=sqrt(3)*v*I_fl1*pow_fact*eff; +disp(sprintf("(a) The maximum rating when the motor starts at full voltage is %f kW",p1/1000)); + +//solution (b) +I_fl2=I/((0.8^2)*5); +p2=sqrt(3)*v*I_fl2*pow_fact*eff; +disp(sprintf("(b) The maximum rating when the motor is used with an auto-transformer is %f kW",p2/1000)); + +//solution (c) +I_fl3=I/((0.578^2)*5); +p3=sqrt(3)*v*I_fl3*pow_fact*eff; +disp(sprintf("(c) The maximum rating when the motor is used with star-delta starter is %f kW",p3/1000)); + +//The answers are slightly different due to precision of floating point numbers + +//END + + + + + + + + + + + |