diff options
Diffstat (limited to '1538/CH17')
-rwxr-xr-x | 1538/CH17/EX17.1/Ex17_1.sce | 13 | ||||
-rwxr-xr-x | 1538/CH17/EX17.2/Ex17_2.sce | 17 | ||||
-rwxr-xr-x | 1538/CH17/EX17.3/Ex17_3.sce | 15 | ||||
-rwxr-xr-x | 1538/CH17/EX17.4/Ex17_4.sce | 16 |
4 files changed, 61 insertions, 0 deletions
diff --git a/1538/CH17/EX17.1/Ex17_1.sce b/1538/CH17/EX17.1/Ex17_1.sce new file mode 100755 index 000000000..2c67c654c --- /dev/null +++ b/1538/CH17/EX17.1/Ex17_1.sce @@ -0,0 +1,13 @@ +//example-17.1
+//page no-511
+//given
+//density of nickel and nickel oxide (NiO)
+rhom=8900 //kg/m^3
+rhoc=7080 //kg/m^3
+//molecular weight of nickel and nickel oxide
+Mm=58.51
+Mc=74.71
+//molar volumes are
+Vm=Mm/rhom //m^3/mol
+Vc=Mc/rhoc //m^3/mol
+printf ("it is clear that Vc>Vm, so a protective film will form over nickel")
diff --git a/1538/CH17/EX17.2/Ex17_2.sce b/1538/CH17/EX17.2/Ex17_2.sce new file mode 100755 index 000000000..9bec8bc55 --- /dev/null +++ b/1538/CH17/EX17.2/Ex17_2.sce @@ -0,0 +1,17 @@ +//example-17.2
+//page no-513
+//given
+//oxidation loss on the copper surface is 0.1 mm in 25 hours
+t1=25 //hours
+x1=0.1 //mm
+//to find the loss in 300 hours
+t2=300 //hours
+// as we know that oxidation loss is given by
+//x^2=Cp*t
+//for t1 and t2 we have following equations
+//x1^2=Cp*t1 -------(1)
+//x2^2=Cp*t2 -----------(2)
+//dividing equation 1 by 2
+//we get
+x2=x1*sqrt(t2/t1) //mm
+printf ("loss in 300 hours is %f mm",x2)
diff --git a/1538/CH17/EX17.3/Ex17_3.sce b/1538/CH17/EX17.3/Ex17_3.sce new file mode 100755 index 000000000..d43f884c7 --- /dev/null +++ b/1538/CH17/EX17.3/Ex17_3.sce @@ -0,0 +1,15 @@ +//example-17.3
+//page no-515
+//given
+//atomic weight and density of magnesium
+MMg=24.3 //gm
+rhoMg=1.740 //g/cm^3
+//molecular weight and density of MgO
+MMgO=40.3 //gm
+rhoMgO=3.650 //g/cm^3
+//volume of Mg and Mgo
+VMg=MMg/rhoMg //cm^3
+VMgO=MMgO/rhoMgO //cm^3
+//we know that pilling-bedworth ratio is given by
+PBR=VMgO/VMg
+printf ("since PBR is less than 1 so the film formed is not protective ")
diff --git a/1538/CH17/EX17.4/Ex17_4.sce b/1538/CH17/EX17.4/Ex17_4.sce new file mode 100755 index 000000000..9072cc4d5 --- /dev/null +++ b/1538/CH17/EX17.4/Ex17_4.sce @@ -0,0 +1,16 @@ +//example-17.4
+//page no-526
+//given
+//one mole of magnesium weighs
+MMg=0.0243 //Kg
+//current density
+I=20*10^-3 //A/m^2
+//design life of 15 years
+t=15*365*24*3600 //sec
+//charge= 2 faradya
+Q=2*96490 //C
+//charge needed per m^2 of structure's for design life
+q=I*t //A s
+//the amount of magnesium needed
+AMg=MMg*q/Q //kg/m^2
+printf("the amount of magnesiun meeded is %f kg/m?^2",AMg)
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