1.the threshold voltage of n-channel MOSFET can be increased bya.increasing the channel dopant concentrationb. reducing the channel dopant concentrationc.reducing the gate oxide thickness

d.reducing the channel length.(NET DEC 14II) 2.the thevenins equivalent across AB is

3.the input to a differentiator is -5V.the output will be a.square wave b.0Vc.+5V d.sine wave

(NET DEC 14II)

4.in successive approximation converter, input to the comparator is through a.DACb.latchc.flip flopd. sample and hold circuit

.(NET DEC 14II)5.the assembler directive used to give name to some value or symbol for 8086ASM-86 isa.DD b.NAME c.EQU d.PROC

.(NET DEC 14II)6.which of the following is not a infinite loop?a. int I =1; b.for (;;); while(1):{i++}c.int i=0,f; while(t){F=1;}d.int y,x=0do{y=x;} While( x==0);

.(NET DEC 14II)7.in a two cavity klystron the secondary cavity is calleda.buncherb.velocity modulationc.coupled cavityd.catcher .(NET DEC 14II)

8.in FM a. carrier never becomes zerob.J-coefficient ocassionaly are negativec.total power remains constant with respect to modulation indexd.pulse rate decreases. (NET DEC 14II)

9.in thyristor di/dt failure is prevented by a.putting L in series with anodeb.putting R in series with anodec.putting C in series with anoded.putting RC in series with anode (NET DEC 14II)

10.The driving point impedance Z(S) of a network has pole-zero plot as shown in the fig.If Z(0)=3, then Z(s)=?

a.Z(S)=3(s+3)/S2+2s+3b. Z(S)=2(s+3)/S2+2s+2c. Z(S)=3(s-3)/S2+2s+2d. Z(S)=2(s-2)/S2+2s+2 .(NET DEC 14II)

11.the CE configuration is normally preferred because it provides ;1.voltage gain2.current gain3.power gain4.stabilityWhich is correct a.1,2b.1,2,3c.2,3d.2,3,4 (NET DEC 14II)

12.an element between the two terminals of a network to which a connection can be made is called________ while the branches of the tree is called ________1.branch 2.node3.twig4.loopWhich is correct ?1,22,3

3,41,4 .(NET DEC 14II)

13.consider the following statements regarding an RC phase shift oscillator :1.amplifier gain is positive2. amplifier gain is negative3.phase shift introduced by the feedback network is 1800

4. phase shift introduced by the feedback network is 3600 .(NET DEC 14II)

14.read the following statements 1. gate is a combinational circuit. 2.JK flip flop in toggle mode is not combinational logic3.MS JK FF suffers from race hazard 4. counters are sequential logicWhich is correct?a.1,2b.2,3c.1,3d.1,2,3 .(NET DEC 14II)

15.which of the following provide I/O facilities?1.82792.81553.82594.8255

a.1,2b.2,3c.3,4d.2,4 (NET DEC 14II)

16.the three types of the loops available in C language are:1.for2.while3.do-whileWhich loops do not operate without testing the condition even once?a.1,3b.1,2c.2,3d.1,2,3 (NET DEC 14II)

17.a PIN diode can not be used as a 1.microwave switch 2.microwave mixor

3. microwave detector .(NET DEC 14II)

18.read the statements:1. DSB has two side bands and SSB has one2. DSB has carrier andtwo side bands and SSB has acarrier and a side band3. DSB has carrier and two side bands and SSB without carrier and two different side bandsWhich statements are correct ?a.1,2b.2,3c.1,3d.1,4 .(NET DEC 14II)

19.which of the following are biredirectional devices? 1.SCR 2. TRIAC3.DIAC 4.SCS

a. 1,2 b.2,3c.1,3 d.1,2,3

(NET DEC 14II)

20.which of the following transducer are not linear?1.thermistor2.thermocouple3.IC sensora.1,2b.2,3c.1,3d.1,2,3 (NET DEC 14II)

21.which one of the following is not a LED material?1.GaAs 2.GaP3.Si 4.SiO2

a.1,2 b.2,3c.3,4 d.1,4 . (NET DEC 14II)

22.which of the following quantities can not be measured /determined using HALL effect?1.type of the semiconductor 2.band gap3.diffusion constant 4.carrier concentrationa.1,2b.2,3c.1,4d.1,3 .(NET DEC 14II)

23.which of the following are not part of an AM Superheterodyne receiver?1.De emphasis netwok 2.mixer3.IF amplifier 4.limiter

a.1,2 b.1,4c.1,3 d.2,4 .(NET DEC 14II)

24.the following is true for multimode graded index fiber:1. the R.I varies as the function of radial distance from the centre2.the R.I undergoes sudden change at the the cladding boundary 3.it provides vetter band width and the data rate than the multimode step index 4.it provides the better bandwidth and data rate than single mode step indexa. 1,3b. 2,4c.1,4d.3,4 (NET DEC 14II)

25.A MOSFET differs from the JFET because 1. of the characteristics2.the MOSFET has two gates3.theJFET has p-n junctions4.of the physical reduced size.a.1,2b.1,3c.1,4d.2,3 (NET DEC 14II)

26. match the following. a. n*p i.26mV/Tb. PN diode ii.2/I VP I(√ IDS−IDSS)c.JFET iii. ID=K(VGS-VGST)2

d. enhancement MOSFET iv. Mass action law

A b c d(A) iii i iv ii(B) ii iv iii i(C) iv i ii iii(D) i ii iv iii

.(NET DEC 14II)

27. list 1 list IIa. h-parameter i. o/p voltage varies as

the slope of input voltage

b.differentiator ii.noise divisionc.half-wave rectifier iii.function of a Q

point d.integrator iv. Series diode clipper

A b c d(A) iii i iv ii(B) ii iii iv i(C) i iv ii iii(D) iv iii i ii .(NET DEC 14II)

28. list I list II

a.Volatge shunt negativefeedback i.increase of CMRRb.constant current source differentialamplifier ii.op voltage

attenuated by the factor 1/29

c.phase shift oscillator iii.FSK detectord.PLL iv.decrease of o/p

impedence

A b c d(A) i iii iv ii(B) iv i ii iii(C) iii ii i iv(D) ii iv iii i.(NET DEC 14II)

30LIST I LIST II a.8086 i.128byte RAM b.8051 ii.2-key lock out c.8279 iii.3 chip configuration d.8085 iv. Maximum mode

A b c d(A) iii i iv ii(B) ii I iii iv (C) iv i ii iii(D) i iii iv ii.(NET DEC 14II)

31.LIST –I LIST –IIa.associativity i.memeory storage

b.#define ii.if- then-elsec.auto iii.operators with

equal precedence

d.conditional operator iv.define operator

A b c d(A) i iii iv ii(B) iii Iv i ii (C) iv ii iii i(D) ii iv i iii.(NET DEC 14II)

32.list –I List –IIa.DSB-SC modulation i.envlope detectionb.SSB-modulation ii.foster seeleyc.AM modulation iii.weaver methodd.phase-shift detection iv.balanced modulator

A b c d(A) i iv ii iii(B) iv Iii i ii (C) ii i iv iii(D) iii ii i iv.(NET DEC 14II)

33.list –I list-ii a. snubber circuit i.SCRB.Inverter ii.high efficiencyc.phase control iii.dv/dt protectiond.SMPS iv.UJT

34.List –I list -iia.miller sweep in CRO i.storage oscilloscopeb.study of transiaents ii. Integratorc.korkrotkodd sound iii.phase measurementd.lissajous pattern iv.blood pressure A b c d(A) i iii ii iv(B) iii Iv ii i (C) ii i iv iii(D) iv ii iii i.(NET DEC 14II)

35.list –I list-iia.power efficient transmission i.SSB-SCB.Most bandwidth efficient transmission

of voice signal ii.VSBc.simplest receiver iii.FMd.bandwidth efficient transmission of signals with significant dc component iv.AM

A b c d(A) i ii iii iv(B) iii I iv ii (C) iv ii iii i(D) ii iv i iii.(NET DEC 14II)

36. assertion(A):MOS ICs based on MOSFET structure find wide application in digital field. Reason (R); MOS ICs have small size and are easy to fabricate. .(NET DEC 14II)

37. assertion(A):the series pass transistor in a regular is in class A mose. Reason (R);class A is a switching mode and yields high effieiency. .(NET DEC 14II)

38. assertion(A):the most commonly used amplifier in S/H circuit is unity gain NINV amplifier. Reason (R);at the sampling state signal building is not desired.(NET DEC 14II)

39.assertion(A): in some application it is required to delay pulse train by some number of clock periods Reason (R); for delay operation derail in parallel out shift registers are useful.

(NET DEC 14II)

40. assertion(A):interfacing is a technique to make operation of peripheral or I/O device compatible with that of a microprocessor Reason (R);some peripherals and I/O devices are not TTL compatible. .(NET DEC 14II)

41. assertion(A):C uses many data types such as integers(short and long)and float etc. Reason (R);conversion specifier used for short unsigned integer is %lu. .(NET DEC 14II)

42. assertion(A):the two types of optical sources used in transmitter of optical communication link are LED and LASER. Reason (R);LASER s are costly hence not preferred for small distance low cost systems..(NET DEC 14II)43. assertion(A):in application such as FM and FSK,VCO plays an important role. Reason (R);the frequency control is easily possible by varying dc voltage. (NET DEC 14II)

44. assertion(A):SCR and SCS belong to the thyristor category . Reason (R); what distinguishes between SCS from SCR is that SCS is two gate voltage..(NET DEC 14II)

45. assertion(A):oscilloscope provides graphical representation of time varying signals. Reason (R);bandwidth is the limitation of oscilloscope..(NET DEC 14II)

46.a multimode step index fibre has glass core(n1=1.5)and fused quartz cladding (n2=1.46),which one of the following is the value of acceptance angle?a.20.20 b.21.20

c.22.20 d.76.70.(NET DEC 14II)

47.following is not the usual classification of an optical fibre.a.single mode step indexb.single mode graded indexc.multimode step indexd.multimode graded index.(NET DEC 14II)

48.when atoms in direct bandgap semiconductors move from higher energy state(E2)to lower energy state (E1) and emission of light takes place , the energy of emitted photon is given asa. hv12=E1-E2

b. hv12=E2/E1

c. hv12>E2-E1

d. hv12<E2-E1.(NET DEC 14II)

49.which of the following are the cases of signal attenuation ?1.SPLICING2.intermodal delay 3.scattering 4. chromatic dispersion a.1,3 b.2,3 c.1,4 d.2,4.(NET DEC 14II)

50.the following are correct about a semiconductor LASER:1. it requires population inversion 2.it has shorter lifetime than LED3.it demonostrates spontaneous emission phenomenon 4.it genertates monochromatic incoherent light Find out the correct answers

a.1,2b.1,3c.1,4d.2,4 .(NET DEC 14II)