ELECTRONICS SYSTEMS AND TECHNOLOGIES QUESTIONS - average.docx

ELECTRONICS SYSTEMS AND TECHNOLOGIES QUESTIONS AVERAGE QUESTION 1.

In elect electro roac acou oust stc cs! s! "#at "#at $o %ou %ou cal call l t#e t#e e&ua e&uat ton on s#o" s#o" to 'easure re(er)eraton t'e*  RT 60=

ANS+ER, /.

9/5 MH<-976 MH<



T#e T#e a)l a)lt t% % o3 o3 an an ant anten enna na to sen$ sen$ or rece rece(e (e sn snal als s o(e o(er r a narro" #or
.

Reonal Center

A tel tele4 e4#o #one ne su)s su)scr cr) )er er lne lne 'ust 'ust #a(e #a(e an SNR SNR $@ a)o(e =6. +#at s t#e 'n'u' nu')er o3 )ts* ANS+ER,

7.

9.9 u'

In E-GSM E-GSM 966! 966! t#e t#e 3re 3re&u &uenc enc% % o3 o3 t#e t#e A)so A)solut lute e Ra$ Ra$o o >re& >re&ue uenc% nc% C#annel Nu')er A>CN2 re3ers to ts center 3re&uenc% an$ t#e allocate$ s /66 ?H
5.

Norrs-E%rn E&uaton

T#s T#s s t#e t#e # ##e #est st-r -ran an;n ;n  o33 o33c ce e n n t#e t#e DDD DDD net net"o "or; r; n tele4#on% n ter's o3 t#e s
=.

−Sln (1−a´ )

+#at +#at s t#e t#e 'a0 'a0' 'u' u' core core $a' $a'et eter er n u'2 u'2 3or 3or a 3)e 3)er r 3 3 t t s to o4erate n snle 'o$e at a "a(elent# o3 1556 n' 3 t#e #al3 anle o3 acce4tance cone s 7.89 O* ANS+ER,

:.

  0.049

$rect(t%

A =66 =66 ;' re4e re4eat ater er s%st s%ste' e' cons conss sts ts o3 ' $en $ent tca cal l ca) ca)le le secton "t# B  6.= $@;' an$ ' $entcal a'4l3ers "t# :6 $@ 'a0'u' an. >n$ t#e re&ure$ nu')er o3 sectons so t#at out  56 '+ "#en  n  / +.

ANS+ER, 8.

In an o4tcal 3)er! t#ose eo'etrcal 4at#s "#c# 4ass t#rou# t#e a0s o3 s%''etr% an$ o)e% t#e sel3-nter3erence con$ton are ;no"n as FFFFF. ANS+ER,

9.

TE /6

>n$ t#e (eloct% o3 a satellte n a crcular or)t 566 ;' a)o(e t#e eart#s sur3ace. ANS+ER,

1=.

7:8 '+

A snal 4ro4aate$ n a "a(eu$e #as a 3ull "a(e o3 electrc ntenst% c#ane )et"een t"o 3urt#er "alls! an$ no co'4onent o3 t#e electrc 3el$ n t#e $recton o3 4ro4aaton. T#e 'o$e s ANS+ER,

1:.

==.5 ;'

An solator #as a 3or"ar$ loss o3 6. $@ an$ a return loss o3 /7 $@. A source 4ro($es 1 + to t#e solator! an$ t#e loa$ s resst(e "t# an S+R o3 :. Ho" 'uc# 4o"er s $ss4ate$ n t#e loa$* ANS+ER,

1/.

1/.=5 ;+

Ho" 3ar 3ro' t#e trans'tter coul$ a snal )e rece(e$ 3 t#e trans'ttn an$ rece(n antennas "#ere =6 ' an$ /6 '! res4ect(el%! a)o(e le(el terran* ANS+ER,

11.

Mer$an ra%

Calculate t#e total trans'tte$ 4o"er o3 an a' trans'tter "t# a 16 ;" carrer "#c# trans'ts 11./ ;" "#en 'o$ulate$ at 56 "t# anot#er sne "a(e. ANS+ER,

16.

5

.7 ;'s

+#at s a 4ac;et )ase$ $ata net"or;! "#c# s "ell sute$ 3or non-real t'e nternet usae nclu$n t#e retre(al o3 e'als! 3a0es! an$ as%''etrc "e) )ro"sn! "#ere t#e user

$o"nloa$s 'uc# 'ore $ata t#an t u4loa$s on t#e nternet* It can su44ort 'an% users )ut n a )urst%J 'anner. ANS+ER,

15.

It s a 'ore a$(ance$ u4ra$e to t#e GSM stan$ar$ t#at re&ures a$$tonal #ar$"are an$ so3t"are o3 e0stn )ase statons. It allo"s 3or nne $33erent autono'ousl% an$ ra4$l% selecta)le2 ar nter3ace 3or'ats. It s ;no"n as 'ult4le 'o$ulaton an$ co$n sc#e'e MCS2! "t# (ar%n $erees o3 error control 4rotecton. +#at s t#s t#at "as $e(elo4e$ 3ro' t#e $esre o3 GSM an$ IS-1:7 o4erators to #a(e a co''on tec#nolo% 4at# to e(entual :G ## s4ee$ $ata access* ANS+ER,

17.

EDGE

>or a (en lent# o3 RG 8AU coa0al ca)le "t# a $str)ute$ ca4actance C 97.7 4>'! a $str)ute$ n$uctance L /=1.57 nH'! $eter'ne t#e (eloct% 3actor. ANS+ER,

1.

GRS

6.79

Assu'e a rece(er s locate$ 16 ;' 3ro' a 56 "att trans'tter. T#e carrer 3re&uenc% s 966 MH
ANS+ER,

-91.5 $@+