BEL Placement Paper Technical - Electronics all India-4 Jun 2010
there were total of 150 ques and a time of 2.30 hrs. for ece branch.q-1 based on passege and 6 ques.q-7-8 synonymsq 9-10 fill in the blanks15-20 a table was given and we have to ans based on that 21-25 again simple ques based on puzzle test.26-30 simple ques based on series likefour rules were given and we have to identify what type of rule is being followed by series.now technical part startedbased on all subjects ie. analog electr,digital elec,analog n digital comm.,op-amp,radar,s-xform,con system,microwave .few ques r like thiswhat is laplace xform of integral of f(t).one based on xfer funclap xfom of c1f(t)+c2f(t)by adding pentavalent imp which semi cond is formedcommonly used trivalent imp.if a -ve feedbak is used then what is o/p r+s or r-s 1 based on routh hurwitzunit of conductivityangstorm=?10^-10 m ,etcwhich of the foll is analog modlnwhich of the foll is digital modln techamplify gives more o/p than i/p isnt it violation of law of enegyAns. it use dc power so law is not violated based on ic-555antena used for tvname of satelite use for earth resourcesradar ques based on prf,radar eqn,which is tracking radarstandard time taken in tv scanalpha of plumbicon tubegauss law2-3 ques on microprocessorwhich window is used for n/wmin ram reqd in 95 windowseq after(777)8 n (1111)2 here 8 n 2 r base in digi elec.853.29 can be represented as _____ in float representshifting left is equalent to---------ans. multiply by 2if we req o/p eual to i/p then which flip-flop wii be used gate use for making inv-----ans nandarea under unit impulsein whic amp curr flows for full cycle---a,ab,cwhic antena is not omnidirmany ques from microwavewhich jun is formed by recrystallizationat microwave freq ohm law isa)J=sigmaE b)J=sigma/E
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