201. Stray filter A. coefficient quantization error in Direct form realization of IIR filters B. coefficient quantization error in cascaded-Direct form realization of IIR filters C. coefficient quantization error in ladder form realization of IIR filters D. none of above ANSWER: A

202. Limit cycle is A. zero input limit cycle B. overflow limit cycle C. a & b D. none of above ANSWER: C

203. The effects of limit cycles in first and second order systems were studied by A. Hendy using an effective value model B. Thomson using an effective value model C. Jackson using an effective value model D. none of aboveANSWER: C

204. If a is positive the limit cycle will have A. variable magnitude by alternating sign. B. constant magnitude by alternating sign. C. constant phase by alternating sign. D. none of above ANSWER: B

205. What is scaling? A. Scaling must be done in such a way that no overflow occurs at the summing point. B. Scaling must be done in such a way that overflow occurs at the summing point. C. Scaling must be done in such a way that no underflow occurs at the summing point. D. none of aboveANSWER: A

206. The necessary and sufficient condition for preventing overflow in a IIR digital filter.

A.

B.

C.D. None of the aboveANSWER: B

207. The band of integers is known as the "deadband". A. true B. false C. either true or false D. none of above ANSWER: B

208. In the second order system, under rounding, the output assumes a cyclic set of values of the deadband.

A. limit-cycle. B. band-cycle. C. dead-cycle. D. none of above ANSWER: A

209. With finite precision the reponse does not converge to the origin but assumes cyclically a set of values:

A. the limit-cycle. B. band-cycle. C. dead-cycle. D. none of above ANSWER: A

210. With infinite precision the response converges to the. . .......... A. origin. B. center. C. mid. D. none of aboveANSWER: A

211. Below figure Shows:

A. Quantisation error in rounding. B. Quantisation error in truncation in 2’s complement. C. Quantisation error in truncation in sign magnitude. D. none of aboveANSWER: A

212. below figure shows:

A. Quantisation error in rounding. B. Quantisation error in truncation in 2’s complement. C. Quantisation error in truncation in sign magnitude. D. none of aboveANSWER: B

213. Below figure shows:

A. probabilistic characteristics of Quantisation error in round-off. B. probabilistic characteristics of Quantisation error in truncation in 2’s complement. C. probabilistic characteristics of Quantisation error in truncation in sign magnitude. D. none of aboveANSWER: A

214. Below figure shows:

A. probabilistic characteristics of Quantisation error in round-off. B. probabilistic characteristics of Quantisation error in truncation in 2’s complement. C. probabilistic characteristics of Quantisation error in truncation in sign magnitude. D. none of aboveANSWER: B

215. This is a deterministic frequency response error is referred to as…………... A. coefficient quantization error B. product quantization error C. a & b D. none of above ANSWER: A

216. A digital system is characterized by the difference equation y(n)=0.9 y(n-1) + x(n) with x(n)=0 and initial condition y(-1)=12. Determine deadband of the system.

A. [-5,5] B. [-3 , 3] C. [-1,1] D. none of above ANSWER: A

217. FIR filters are ….. generally as sensitive to coefficient roundoff. A. not B. less

C. most D. none of above ANSWER: A

218. FIR filters often require more computation, because you must do ………… for each term in the impulse response.

A. a multiply-add B. add C. multiply D. all of aboveANSWER: D

219. FIR filters can be ………. delay, IIR filters can…………. A. constant, not B. not, constant C. not, not D. none of aboveANSWER: A

220. “Linear Phase” (constant delay), If a filter has a ………….delay, the phase shift of the filter will be t*w, where t is the time delay, and w the natural frequency (2*pi*f). a.

A. constant B. variable C. equal D. none of above ANSWER: A

221. Non-linear delay, This is the part of the phase shift (in and around the filter’s passband) that is not modeled by a ………...

A. straight line B. circle C. square D. none of aboveANSWER: A

222. Power of quantization noise

A.

B.

C.D. None of the above.

ANSWER: A

223. If you don’t want a zero at pi, you can’t use a symmetric ……-length filter. You can use an antisymmetric even length filter if you want a highpass filter, but then you’ll have a zero at DC. This means that symmetric high pass filters are of …… length.

A. even , odd B. odd, even C. even, even D. none of aboveANSWER: A

234. 1. The voltage levels for a negative logic systemA. must necessarily be negative

B. could be negative or positiveC. must necessarily be positiveD. must necessarily be either zero or —5 V

ANSWER: B

235. The output Qn of a J-K flip-flop is zero. It changes to 1 when a clock pulse is applied. The inputs Jn and Kn are respectively

A. 1 and X

B. 0 and XC. X and 0D. X and 1

ANSWER: A

236. The larger the RAM of a computer, the faster is its speed, since it eliminatesA. need for ROM

B. need for external memoryC. frequency disk I/O sD. need for a data-wide path

ANSWER: C

237. DB, DW and DD directives are used to place data in particular location or to simply allocate space without preassigning anything to space. The DW and DD directories are used to generate

A. offsetsB. full address of variablesC. full address of labelsD. offsets of full address of labels and variables

ANSWER: D

238. The number of bits needed to address 4K memory isA. 6

B. 8C. 12D. 16

ANSWER: C

239. The ESC instruction of 8086 may have two formats. In one of the formats, no memory operand is used. Under this format, the number of external op-codes (for the co-processor) which can be specified is?

A. 64

B. 128C. 256D. 512

ANSWER: B

240. The TRAP is one of the interrupts available its INTEL 8085. Which one of the following statements is true of TRAP?

A. It is level triggered

B. It is negative edge triggeredC. It is positive edge triggeredD. It is both positive edge triggered and level triggered

ANSWER: D

241. In a 16-bit microprocessor, words are stored in two consecutive memory locations. The entire word can be read in one operation provided the first

A. word is even

B. word is oddC. memory location is oddD. memory address is even

ANSWER: D

242. A 3 x 8 decoder with two enable inputs is to be used to address 8 blocks of memory. What will be the size of each memory block when addressed from a sixteen bit bus with two MSBs used to enable the decoder

A. 2KB. 4KC. (c)16KD. 64K

ANSWER: C

243. The following . items consist of two statements, one labeled as ‘Assertion A ‘ and the other labeled the ‘Reason R’. You are to examine these two statements carefully and decide if the Assertion A and the Reason R are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly:

Codes:

A. Both A and R are true and R is the correct explanation of A.B. (b)Both A and Rare true but R is NOT a correct explanation of A.C. A is true but R is falseD. (d)A is false but R is true

244. Assertion (A): TTL and CMOS cannot be normally used together.

Reason (R) : .TTL operates on a (±5 0.25) V regulated supply voltage and some mA, while the CMOS operates on unregulated supply voltage of +3 to +15 and some microA.

ANSWER: B

245. Assertion (A): Machine language program is written in hexadecimal.

Reason (R) : Microprocessor can understand hexadecimal number system.ANSWER: D

246. A JK flip-flop has its J input connected to logic level 1 and its K input to the Q output. A clock pulse is fed to its clock input. The flip-flop will now

A. change its state at each clock pulse

B. go to state 1 and stay thereC. go to state 0 and stay thereD. retain its previous state

ANSWER: A

247. A decade counter requiresA. 10 flip-flops

B. 4 flip-flopsC. 3 flip-flopsD. 2 flip-flops.

ANSWER: D

248. The decimal value for the BCD coded number 00010010 isA. 6

B. 10C. 12D. 18.

ANSWER: C

249. The Boolean expression (A+C÷D) (B+D+C) may be simplified asA. AB + CB

B. (b)AB+C+÷DC. A+BC+DD. A+B+CD.

ANSWER: B

250. An adder takes……. Input/s and produces………. Output/sA. one, two

B. two, twoC. three, twoD. two, three.

ANSWER: C

251. Increasing the precision of the REAL data type requires using at least one additional bit inA. the mantissa

B. the exponent

C. both the mantissa and the exponentD. none of the above.

ANSWER: A

252. Let * be the binary operation on rational numbers given a*b=a+b+2ab. Which of following are true?

I. * is commutative

II. There is a rational number that is a*identity

III. Every rational number. has as a* inverse.

A. I onlyB. II onlyC. I and IID. I,II and III

ANSWER: C

253. How many 1 are present in the binary representation of 15 x 256 + 5 x 16 + 3?A. 8

B. 9C. 10D. (d)11

ANSWER: A

254. Which of the following combinations of gates does not allow the implementation of an arbitrary Boolean function?

A. OR gates and inverters only

B. NAND gates onlyC. OR gates and exclusive – OR gates onlyD. OR gates and NAND gates.

ANSWER: D

255. Which logic circuit is the fastest?A. TTLB. DTLC. RTLD. All have same speed.

ANSWER: A

256. A half adder hasA. 2 inputs and 2 outputs

B. 2 inputs and 3 outputsC. 3 inputs and 3 outputsD. None of the above.

ANSWER: A

257. The main advantage of flip-flops over transistor circuit isA. immunity from noise

B. low heatingC. low propagation delay timeD. high propagation.

ANSWER: C

258. The Integrated injection Logic has higher density of integration than TT’L because itA. does not require transistors with high current gain and hence they have smaller geometry

B. uses bipolar transistorC. does not require isolation diffusionD. uses dynamic logic instead of static logic.

ANSWER: B

259. In a positive edge triggered JK flip-flop, a low J and a low K produce the……. state A high J and a high K mean that the output will …….on the rising edge of the clock

A. active…. race

B. inactive ……deadC. inactive …..toggleD. active …..constant

ANSWER: C

260. How many bits does one need to encode all twenty-six letters, ten symbols, and ten numerals?

A. 5

B. 6C. 7D. 46

ANSWER: B

261. Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign = and magnitude.In which representation is there overflow from the addition of the integers 1000 and 011000 ?

A. Two’s complement only

B. Sign and magnitude and one’s complement onlyC. Two’s complement and one’s complement onlyD. All three representations.

ANSWER: D

262. Which of the following sets represents a universal logic family?

A. NANDB. XORC. NORD. None of the above.

ANSWER: A

263. The maximum propagation value in case of 7400 NAND gates is

A. 1 secondB. 20 milli secondsC. less than 20 nano secondsD. less than 20 pico seconds.

ANSWER: C

264. The total number of Boolean functions which can be realized with your variables Is ?A. 4

B. (b)16C. 256D. 65,536

ANSWER: B

265. The Fourier series expansion of odd function with half wave symmetry will have only odd harmonics

A. trueB. false

ANSWER: A

266. The trigonometric Fourier series of an even function of time does not contain

C. sine termD. odd harmonic termE. cosine termF. DC termANSWER: A

267. The trigonometric Fourier series of a periodic time function have

G. sine termsH. cosine termsI. DC term and (a) and (b)J. both (a) and (b)ANSWER: D

268. For expansion in Fourier series, the function f (t) must be/have

K. single valued function of tL. only finite number of discontinuitiesM. finite number of maxima and minimaN. all of theseO. (f) only (a) and (c)ANSWER: E

269. The number of polynomials that can go through two fixed data points (x1 , y1) and (x2 , y2) isA. 0B. 1C. 2D. infiniteANSWER: D

270. A unique polynomial of degree __________________ passes through n+1 data points.

A. n+1

B. n+1 or lessC. nD. n or less ANSWER: D

271. The following function(s) can be used for interpolation:A. polynomialB. exponential

C. trigonometricD. all of the above

ANSWER: D

272. Polynomials are the most commonly used functions for interpolation because they are easy to

A. evaluateB. differentiateC. integrateD. evaluate, differentiate and integrateANSWER: D

273. Given n+1 data points (x0 , y0 ) , (x1 , y1) , .. .. . ., (xn−1 , yn−1) , (xn , y n) , assume you pass a function f ( x ) through all the data points. If now the value of the function f ( x ) is required to be found outside the range of the given x -data, the procedure is called

A. extrapolationB. interpolationC. guessingD. regressionANSWER: A

274. Given three data points (1,6), (3,28), and (10, 231), it is found that the function

y=2x2+3 x+1 passes through the three data points. Your estimate of y at x=2 is most nearly:

A. 6B. 15C. 17D. 28

ANSWER: B

275. A unique polynomial of degree ______________ passes through n+1 data points.

A. n+1B. nC. n or less

D. 1n or lessANSWER: C

276. A FIR system her feedback. This statement is: 1. true2. falseANSWER: B

277. FIR systems Rave foot output terms. This terms. This statement is 1. true2. false

ANSWER: B

278. IIR system have past output terms. This statement is A. trueB. falseANSWER: A

279. Direct form-I and Direct form-II exists for

A. FIR system onlyB. IIR system onlyC. both (a) and (c)D. none of theseANSWER: B

280. For Hanning window function

1. α = 0.42. α = 0.53. α = 0.254. α = 0.6ANSWER: B

281. For Hamming window function

1. α = 0.542. α = 0.453. α = 0.494. α = 0.51ANSWER: A

282. A ________ filter rejects all frequencies within a specified band and passes all those outside this band.

A. low-passB. high-passC. band-passD. band-stopANSWER: D

283. Filters with the _________ characteristics are useful when a rapid roll-off is required because it provides a roll-off rate greater than -20dB/decade/pole.

A. ButterworthB. ChebyshevC. BesselANSWER: B

284. A ________ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.

A. Low PassB. High PassC. Band PassD. Band Stop.ANSWER: B

285. Refer to the given circuit. The circuit is known as ------------ filter and the fc is----------?

A. high-pass, 1.59 kHzB. band-pass, 15.9 kHzC. low-pass, 15.9 kHzD. high-pass, 15.9 kHzANSWER: D

286. The bandwidth in a ________ filter equals the critical frequency.A. Low PassB. High PassC. Band PassD. Band Stop.ANSWER: A

287. Filters with ---------- characteristics are used for filtering pulse waveforms:A. ButterworthB. ChebyshevC. BesselANSWER: C

288. Refer to the given figure. The roll-off for this filter is about:

A. 20dB/decadeB. 40dB/decadeC. 60dB/decadeD. 80dB/decadeANSWER: A

289. Refer to the given figure. The roll-off for this filter is about:

A. 20dB/decadeB. 40dB/decadeC. 60dB/decadeD. 80dB/decadeANSWER: A

290. Which filter exhibits a linear phase characteristic?A. BesselB. ButterworthC. ChebyshevD. All of the above.ANSWER: A

291. Refer to the given figure. The cutoff frequency of this filter is---------------, and the circuit is known as----------?

A. 721 Hz, low-pass filterB. 721 Hz, high-pass filter

C. 72 Hz, low-pass filterD. 721 Hz, band-pass filter.ANSWER: A

292. The critical frequency is defined as the point at which the response drops ________ from the passband.

A. -20dBB. -3dBC. -6dBD. -40dBANSWER: B

293. Filters with the ______ Characteristic provide a very flat amplitude in the passband and a roll-off rate -20dB/decade/pole.

A. ButterworthB. ChebyshevC. BesselANSWER: A

294. Fast convolution techniques:A. overlap saveB. overlap addC. a & bD. none of aboveANSWER: C

295. CorrelationA. It gives a measure of similarity between two data sequences.B. It gives a measure of dis-similarity between two data sequencesC. a & bD. none of aboveANSWER: A

296. Find the response of an FIR filter with impulse response h(n)= {1,2,4} to the input sequence x(n)={1,2}.

A. y(n)={1,4,8,8}B. y(n)={1,4,6,6}C. y(n)={1,2,8,8}D. none of aboveANSWER: A

297. IIR filters A. Use feedback B. Are sometimes called recursive filters C. Can oscillate if not properly designed D. all of the above

ANSWER: A

298. A Blackman window can eliminate ripple in FIR filters. The tradeoff is A. larger transition bandwidth B. smaller transition bandwidth C. a non-linear phase response D. possible instability ANSWER: A

299. The output of two digital filters can be added. Or, the same effect can be achieved by A. adding their coefficients B. subtracting their coefficients C. convolving their coefficients D. Averaging their coefficients and then using a Blackman window.ANSWER: A

300. The letter A below indicates the filter A. stopband B. transition band C. passband D. rippleANSWER: C