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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1938/CH2/EX2.34 | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '1938/CH2/EX2.34')
| -rwxr-xr-x | 1938/CH2/EX2.34/2_34.jpg | bin | 0 -> 68068 bytes | |||
| -rwxr-xr-x | 1938/CH2/EX2.34/2_34.sce | 19 |
2 files changed, 19 insertions, 0 deletions
diff --git a/1938/CH2/EX2.34/2_34.jpg b/1938/CH2/EX2.34/2_34.jpg Binary files differnew file mode 100755 index 000000000..59828e5f5 --- /dev/null +++ b/1938/CH2/EX2.34/2_34.jpg diff --git a/1938/CH2/EX2.34/2_34.sce b/1938/CH2/EX2.34/2_34.sce new file mode 100755 index 000000000..1486be271 --- /dev/null +++ b/1938/CH2/EX2.34/2_34.sce @@ -0,0 +1,19 @@ +clc,clear
+printf('Example 2.34\n\n')
+
+V=250, I_a1=20, R_a=0.5
+N_1=1000, N_2=500
+
+//T (prop.) I_a and T_1=T_2
+I_a2=I_a1
+E_b1 = V - I_a1*R_a
+
+//N (prop.) E_b
+E_b2= E_b1 *(N_2/N_1)
+R_x= (V-E_b2)/I_a2 - R_a //because E_b2 = V - I_a2*(R_a+R_x)
+printf('Additional resistance = %.0f ohms',R_x)
+T3_by_T2=0.5 //torque is halved
+I_a3= I_a2 *(T3_by_T2) //new armature current
+E_b3 = V - I_a3*(R_x + R_a)
+N_3=E_b3*N_2 / E_b2 //N (prop.) E_b
+printf('\nNew speed = %.3f rpm',N_3)
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