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Unformatted text preview: Electronics—200641 _ _ _ ' SetB: 7 1  The valueuofeC whichgives the.
critical damping in? the given .
circuit is a) 2F b) 4F c) 8F 0 d) 1F 2 A series RLC circuit resonates at 3 MHz and has 3dB bandwidth of 10
kHz. The Q of the circuit at resonance  a) 30 b) 300 c) 300 d) 300% ' g 3 The value of resistance R shown
in the given ﬁgure is a) 3.5 o b) 2.5 o c) 1 Q d) 4.5 o  4 At 3dB frequencies, current in the series RLC circuit equal current at
resonance multiplied by a)1 ' b)—] c)1 1
2 ﬁ , 4 (”SE 5 A series RLC circuit resonates at 1000 kHz. At frequency of 995 kHz, the
circuit impedance is ~
a) Resistive b) minimum 0) Inductive d) capacitive 6 If each stage had gain of 10dB and noise ﬁgure of 10dB, then the overall
noise ﬁgure of twostage cascade ampliﬁer will be
a) 10 b) 1.09 c) 1.0 d) 10.9 7 In Sigmadelta ADC, high bit accuracy is achieved by a) Over sampling and noise shaping b) Over sampling . c) Under sampling d) None of the above
8 Let s(t) denote the delta function. The value of the integral ~16(1)cos(%)a’t is a) 1 b) 1 C) 0 d) ,7/2 .‘ ”‘ l ‘ ’ ' P 1 {11
gm { Indian Space Research Organisation age 0 Electronics — 200611 the ﬁrst system is given byH,(Z): $13: , Input Output
2’2 — 0 223 Z” — 0 82'3
a H Z = b H 2 =
) H 1.042‘ ) 2” 1~052‘l
 Z‘l —0.ZZ‘3 Z‘ ~08Z‘3
c H Z _ d H Z _ '
) 2() 1—042‘! ) 2() l—(LSZ—l
10 The 2  transform of the signal
Ln = —l
Zn=0
x01): —l,n=l
1,72 = 2
0,0therwise
a)z+2—z"+2‘2 b) 2""+2——z+z2
C)z+222—2"+z'2 d) z+2—z“+z‘2
11 For the circuit shown in the given _ 8
ﬁgure, the voltage VAB is 10v _ .0v
5:: 5“ 3100
a) 6V b)10V c)25V d)40V 12 The equivalent capacitance 0,1uF
across ‘ab’ will be 0 lot? 0.1%?! ' 1,
mar 0.1%, of“?
a) 0.2uF b) 0.1 ”F c) 0.5m: d) o
13 .
_ The transfer function, 7‘ (s) is thatofa
5+0 3) Low—pass ﬁlter b) Notch ﬁlter
0) Highpass ﬁlter d) Band—pass ﬁlter 7‘ I ndian ac e earch r 3111' ati
“4'1”? 1 Sp 8R 5 0 g s on \__ Electronics — 200611 . .  SetB
NM.
,, 1,4 A particular current is made up of two components:'a~1"0‘A“dc“a‘n"d"a ' sinusoidal current of peak value of 1.414 A. The average value of the
resultant current is a) Zero b) 24.14A c)1OA d)14.14A
15 By doubling the sampling frequency a) Quantisation noise decreases by 3dB b) Quantisation noise density decreases by 3dB c) Quantisation noise increases by 3dB d) Quantisation noise density increases by 3dB 16 The output voltage (v0) of the
' circuit shown in the given ﬁgure is a)Zero ' b)5.7V ‘ c) 6.9V 'd)12.6v 17 Assuming that only the X and Y logic inputs are available and their complements } and 3’.are not available, what is the minimum number
of twoinput NAND gates requires to implement X EB Y? '
a) 2 . b) 3 c) 4 d) 5 18 In the given network of AND
and OR gates f can be written
as: 3) X0 X1 X2 ...... Xn + X1 X2 ...... Xn + X2 X3 ...... Xn ...... Xn b) X0 X1 + X2 + X3 + ...... +Xn_1 , Xn C) X0 + X1+ X2 + ...... Xn d) X0 X1 X3 ...... Xn1 + X2+X3+X5 ...... Xn1 + ..... + X52 + Xn_1 +Xn 19 A Pulse train with a frequency of 1MHz is counted using a modulo 1024
ripplecounter built with ,JK ﬂipﬂops. For pr0per operation of the
counter the maximum permissible propagation delay per ﬂipﬂop stage
is
a) 100 n sec b) 50 n sec 0) 20 n sec d) 10 n sec 20 The AID converter used in a digital voltmeter could be (1) successive
approximation type (2) Flash converter type (3) Dual slope converter
type. The correct sequence in the increasing order of their conversion times is
8) 1,2,3 b) 2,1,3 0) 3,21 d) 3,1,2 h. .~ ‘3 .  I
‘ . mine 9 ace e earth Oroam t1 Pa e 3 of 11
Eﬁjl Bra I I I] k P R S t: 53 on g a) An 8—bit converter b) A 10—bit converter
0) A 12 bit converter d) A 16 bit converter
22 In a microprocessor, the resister which holds the address of'the next
instruction to be fetched is ‘ a) Accumulator b) Program counter
c) Stack pointer d) instructor register
23 In microcomputer, WAIT sta a) Make the processor wait during 3 DMA operation b) ‘ Make the processor wait during a power interrupt processmg
c) Make the processor wart during a power shutdown d) Interface slow penpherals to the processor 9 statements are correct
1. A ﬂip—ﬂop is used to store =1 bit of information 2. Race~around condition occurs in a JK ﬂipflop when both the
inputs are 1 3. Masterslave conﬁ
information 4. A transparent latch consists of a D
a) 1,2 and3 b) 1,3 and4 guration is used in flip~ﬂops to store 2 bits of ‘ type ﬂipﬂop
0) 1,2 and 4 d) 2,3 and 4
25 How many 1 ‘3 ar e present in the binary representation of
3x512+7x64+5x8+3? ,
a) 8 b) 9 c) 10 d) 11
26 For emittercoupled logic, the switching speed is very high because
a) Negative logic, is used
b) The transistors are not saturated when conducting
c) Emitter~coupled transistors are used
d) . Multi—emitter transistors are used a) A pulse train ,of duration 0.5 sec. b) A pulse train of duration 2 sec.
c) A pulse train of duration 1 sec. d) A pulse train of duration 5 sec. a)1100‘ b)1001 c)O110 d) 0100
29 10 bit AID converters the quantization error is given by (in percent)
a) 1 b) 2 c) 01 d) 0.2 M Page 4 of It Electronics  2006—11 > , 7 Seen 30” For the switch,circuit,mtagking open
as 0 and closed as 1, the
expression for the circuit is Y. a) A+ (B+C) D b) A + BC+ D
c) A (BC+D) d) None of these 31 The Boolean expression for the shaded area in
the Venn' diagram is A z
\ a);+?+z b)X?2+§Tz’ C)X+Y+Z d)§?2+XY If the memory chip size is 256*1 bits, then the number of chips required
32 .
to make up 1K bytes of memory is a)32 b)24 c)12 d)8 33 Given the decimal number — 19, an'eight bit two’s complement
representation is given by 8) 11101110 b)11101101 c) 11101100 d) None ofthese 34 The function shown in the ﬁgure when simpliﬁed will yield a result
with a) 2 terms b) 4 terms 0) 7 terms ' 4 T ' a eRe 3 ch roani at’ Pa e50f11
{an}: m 1 Indian Sp C 58 r 0 b 3 1011 g Electronics — 200611 3) Excess —3 code b) Gray code
c) BCD code d) Hamming code e time requrred for change of state
will be a) 25 ns b) 50 ns c) 75 ns d) 100 ns
37 An electromagnetic wave incident on a perfect conductor is : a) Entirely reﬂected b) Fully transmitted c) Partially transmitted d) None of these d) Z = VL/ C
39 A lossless line of 50 ohms is terminated in a load of 100 ohms resistive.
The VSWR is
a)1:2 b)2:1 (3)41 d)14 3) TE waves
c) TE waves and TM waves n In the two cases are In the ratio of
a)18 b)12 c)21 d)11
42 The bandwrdth requnred for QPSK modulated channel is
a) Twice the BW of BPSK b) Equal to BPSK
0) Equal to FSK  d) Half of the BW of BPSK
43 Magic T is
a) Four partjunction b) Two partjunction
C) Three partjunction d) it is not junction di ( e esearch r03 isat’ Pae60f11
mm In anSpac R 0,: n ion g ..___“\._..._..~~ Electronics  200611 SetB '44 Diplexer is madeﬁrofﬁ 7 , N ,7 ,, . W. a)Only receive ﬁlter b) Only transmit ﬁlter ' c) Only circulator d) Both receive ﬁlter and transmit ﬁlter 45 The gain G of an antenna of effective area A is given by _ a)G=47:/1 b) G=4ﬂ (3)ng d)None A A 1 respectively the characteristic impedance is given by
a)1OOQ b)1OQ c)15Q d)1000OQ 47 The input impedance of short circuited line of length l where
l/4<l</l/2, is a) Capacitive b) inductive c) Resistive d) None of these
48 Maximum coding gain in a) Block Codes b) Convolution Codes c) Turbo Codes d) RS Codes 49 Noise ﬁgure of an ampliﬁer depends on a) Bandwidth b) Outputpower QPOWQWPUV mgsonvimhe 50 BCH code belongs to a) Block Codes b) Convolution Codes
(3) Turbo Codes d) None of the above 51 When a carrier is phase modulated, with an integrated modulating
signal, the resultant is
a) Phase modulated signal b) Frequency modulated signal
0) Amplitude modulated signal d) QPSK modulated signal 52 A satellite orbiting in 600 km orbit transmits 5 GHz frequency. The Doppler shift observed at the ground station, when the satellite. is over
head of the station is a) Zero b) Maximum 0) Inﬁnity d) Egg/id the . Indian ace Research Oroanisatio Pa e 7 of 11
@195 13m Sp ’3 n g Electronics — 200611 'ﬁer with a gain of 3
power of the ampliﬁer a) 1.0w b) OdBm . 's
a) —83dBW b) ~80dBW C) ~86dBW d) +80dBW
57' f7 = 2i~3j,Q= —3i+4j—2k, and I? are. in equilibrium,_ if I? is
a)—i—j+2k b) i—j+2k c)i+j+2k d) i—j—2k gular velocitya) about a ﬁxed
‘ty of a pomt of the body then curl v =
a) (0 b) 02 C) 20 d) 202
59‘ Laplace transform of sin3 2t is
a) 24 b) l __
l32+4 isz+36) lsz+4 Rs2+64)
48 64
C) lsz+4 isz+36) d) 2 60 The value of the determinant O —sin6 0 c0349 a)0 b) 1 CH d)2 51 Solution of (D2 +4)y= sin2 x, is
a) y:Acost+Bsin2x—%§sin2x b) y=Acos2x+Bsin2x+§+£sm2x
C) y:Acost+Bsin2x—%+§sin2x d) y=Acost+Bsin2x+l—isin2x 8
62 The value of k for which the lines 2x+y—] =
3x+ky— 2 = O, are concurrent is a) —2 b) 3 0,4x+3y~3=0 and c) 2 d) 3 $43.7, ; Indian Space Research Organisation \. Page 8 of 11 Electronics — 200611 Set—B ' $77,763 A box contai,n$,,5,bl,ack..and 5 red balls. Two ballsarewrandomly picked one after another from the box, without replacement. The probability for
both balls being red is 1 1 19 2
a —— b  c — d —
) 90 ) 5 ) 90 ) 9
54 x3+xsinx is
a) Constant function ' b) Odd function
0) Even function d) Periodic function
65 J dx is
xsz — 02
a) icosec“l[£) b) lsirﬂ i
(1 a a a
C) lc0546)? ‘ d) lsec—(i)
' a a ~. a a
66 ‘ _ —5 2
Ergen values of 2 2 are a) 6, 1 b) 6, 1 C) 6,1 d) 6,1 67 The approximate equivalent
resistance at the points X1 and
X2 in the circuit shown below a) coo b) 40o c) 809 . d) zoo 68 An inductor supplied with 50 V ac with a frequency of 10 kHz passes a
current of 7.96 mA. The value ofinductor is
a) 1mH b) 10mH c) 100mH d) 1H 69 In a capacitor, the electric charge is stored in 3) Dielectric b) Metal plates
c) Dielectric as well as metal plates d) Neither dielectric nor metal plates 70 Oscillator requires a) No feedback ' b) Negative feedback
c) Positive feedback d) Either positive or negative
feedback
71 Which loss in a transformer varies signiﬁcantly with load?
a) Hysteresis loss b) Eddy current loss
c) Copper loss d) Core loss .  l  Indian ace Research Oroanisation Pa e 9 of 11
smi ISru‘ [ Sp 2: g __, ,___ I _7 ______._ Electronics — 2006—11 73 Time constant ofa series R
a) UR second state current is e steady
V V ' V d) Zero
a — b ~—
) R ) C C) JRZ +02
75 The» given circuit represents a 2C 25;
. “‘1 l‘o
L .
a) Low pass ﬁlter b) High pass ﬁlter 0) Band pass (1) Band stop ﬁlter ﬁlter 76 The very low frequency gain of the low pass ﬁlter shown in the given
ﬁgure is a)10 dB b) 20 dB 77 The timeconstant of the network
shown in the ﬁgure is a) CR. b) 2 CR anisaﬁon Page 10 of 11 K Electronics  200611 . l ‘ SetB 78 _ For the circuit,shownbelowthe ,
current I ﬂowing through the
circuit will be 79 When L is doubled and C is halved, the resonance frequency of series
tuned circuit becomes a) Doubled b) Halved c) One quarter d) Unchanged 80 In a Series resonant circuit, with the increase in L
a) Resonant frequency will decrease
b) ‘ Bandwidth will decrease
c) Q will increase
d) All of these  .. '3 cc Research Or anisation Pa e 11 of 11
m m i Ind] 11 Spa g f g ...
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