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EC-2006 - Electronics—200641 Set-B 7 1 The valueuofeC...

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Unformatted text preview: Electronics—200641 _ _ _ ' Set-B: 7 1 - The valueuofeC which-gives 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 3-dB 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 3-dB 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 two-stage cascade amplifier will be a) 10 b) 1.09 c) 1.0 d) 10.9 7 In Sigma-delta 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 — 2006-11 the first system is given byH,(Z): $13: , Input Output 2’2 — 0 22-3 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) High-pass 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 —- 2006-11 . . - Set-B 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 two-input 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 ...... Xn-1 + X2+X3+X5 ...... Xn-1 + ..... + X52 + Xn_1 +Xn 19 A Pulse train with a frequency of 1MHz is counted using a modulo 1024 ripple-counter built with ,J-K flip-flops. For pr0per operation of the counter the maximum permissible propagation delay per flip-flop 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 J-K flip-flop when both the inputs are 1 3. Master-slave 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 flip-flop 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 emitter-coupled 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 —- 2006-11 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 - 2006-11 Set-B '44 Diplexer is madefir-offi 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 — 2006-11 '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 — 2006-11 Set—B ' $77,763 A box contai,n$,,5,bl,ack..and 5 red balls. Two balls-arewrandomly 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 time-constant of the network shown in the figure is a) CR. b) 2 CR anisafion Page 10 of 11 K Electronics - 2006-11 . l ‘ Set-B 78 _ For the circuit,shownbelow-the , 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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