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253.

A casual LTI system is described by the difference equation
2y[n] = αy[n-2] – 2x[n] + βx[n-1] The system is stable only if [2 marks]
(A) |α| = 2, |β| < 2
(B) |α| > 2, |β| > 2
(C) |α| < 2, any value of β
(D) |β| < 2, any value of α

asked in Electronics and Communication Engineering, 2004

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254.

Consider the sequence x[n] = [-4-j5     1+j2       4]
The conjugate anti-symmetric part of the sequence is [2 marks]
(a) [ -4 – j2.5      j2              4 – j2.5]
(b) [– j2.5           1                     j2.5]
(c) [– j5 j2                        0]
(d) [ -4               1                          4]

asked in Electronics and Communication Engineering, 2004

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255.

A rectangular pulse train s(t) as shown in Fig. is convolved with the signal cos²(4p×10³t) the convolved signal will be a

(a) DC
(b) 12 kHz sinusoid
(c) 8 kHz sinusoid
(d) 14 kHz sinusoid

asked in Electronics and Communication Engineering, 2004

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256.

A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low-pass filter with cut-off frequency 800 Hz. The output signal has the frequency [2 marks]
(a) zero Hz
(b) 0.75 kHz
(c) 0.5 kHz
(d) 0.25 kHz

asked in Electronics and Communication Engineering, 2004

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257.

It is desired to multiply the numbers 0AH by 0BH and store the result in the accumulator. The numbers are available in registers B and C respectively. A part of the 8085 program for this purpose is given below:
MVI A, 00H
Loop; - - - - - - - - - -
…………………………..
…………………………..
HLT END
The sequence of instruction to the complete the program would be
[2 marks]
(a) JNZ LOOP, ADD B, DCR C
(b) ADD B, JNZ LOOP, DCR C
(c) DCR C, JNZ LOOP, ADD B
(d) ADD B, DCR C, JNZ LOOP

asked in Electronics and Communication Engineering, 2004

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258.

A Boolean function f of two variables x and y is defined as follows:
f(0,0) = f(0,1) = f(1,1)=1; f(1,0) = 0
Assuming complements of x and y are not available, a minimum cost solution for realizing f using only 2-input NOR gates and 2-input OR gates (each having unit cost) would have a total cost of [2 marks]
(a) 1 unit
(b) 4 unit
(c) 3 unit
(d) 2 unit

asked in Electronics and Communication Engineering, 2004

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