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diff --git a/3830/CH4/EX4.2/Ex4_2.sce b/3830/CH4/EX4.2/Ex4_2.sce
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+// Exa 4.2

+

+clc;

+clear;

+

+// Given

+

+f = 83.3 ; // frequency of  sinusoidal voltage in KHz

+

+// Solution

+// part a

+

+printf('Being sunchronised, the frequency of the saw-tooth wave will be a submultiple of the signal. \n');

+

+printf(' Frequency of saw-tooth curve = %.2f kHz \n',f/10);

+F = f/10;

+printf(' Period of the saw-tooth curve = %.1f microsec \n',(1/F)*10^3);

+

+// since, Sine wave y = A sin theta

+// but y/A = 0.5(since, end of trace was at position half the amplitide away from x-axis)

+theta = asind(1/2) ;

+printf(' The 10th wave is in short of a complete since wave by %d degrees \n',theta);

+printf(' Therefore, No of full waves of sine form seen on the screen are 9 11/12 waveforms \n');

+

+// Rise time +decay time = period of wave = 120 microsec

+T = 120 ; // period in microsec

+ Rise_by_decay = (119/12) / (10- 119/12);

+DecayTime = Rise_by_decay/T;

+printf(' Decay time = %.1f microsec \n',round(DecayTime));

+printf(' Rise time = %.1f microsec \n',T-DecayTime);

+

+// part b

+

+printf(' Since, increase time base frequency = 10/4 times the final value \n');

+

+L = (10/4)* theta ;

+printf(' Length of trace blanked in degrees due to flyback time = %d degrees \n ',L);

+T_new = T*4/10;

+printf('Period of new time base = %d microsec \n',T_new);

+printf(' Rise time as per new time base = %d microsec \n',T_new-1);