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295.

The z-transfrom of a system is H(z) = z/(z-0.2)
If the ROC is |z| < 0.2, then the impulse response of the system is
[1 mark]
(a) (0.2)ⁿ u[n]
(b) (0.2)ⁿ u[-n-1]
(c) -(0.2)ⁿ u[n]
(d) -(0.2)ⁿ u[-n-1]

asked in Electronics and Communication Engineering, 2004

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296.

The distribution function f_x(x) of a random variable X is shown in Fig, the probability that X = 1 is

[1 mark]
(a) zero
(b) 0.25
(c) 0.55
(d) 0.30

asked in Electronics and Communication Engineering, 2004

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297.

The impulse response h[n] of a linear time-invariant system is given by
h[n]= u[n + 3]+ u[n - 2]- 2u[n - 7]
where u[n] is the unit step sequence. The above system is [1 mark]
(a) stable but not causal
(b) stable and causal
(c) causal but unstable
(d) unstable and not causal

asked in Electronics and Communication Engineering, 2004

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298.

Figure is the voltage transfer characteristic of

[1 mark]
(a) an NMOS inverter with enhancement mode transistor as load
(b) an NMOS inverter with depletion mode transistor as load
(c) A CMOS inverter
(d) A BJT inverter

asked in Electronics and Communication Engineering, 2004

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299.

Figure shows the internal schematic of a TTL AND-OR-Invert (AOI) gate. For the inputs shown in Figure, the output Y is

[1 mark]
(a) 0
(b) 1
(c) AB
(d) AB

asked in Electronics and Communication Engineering, 2004

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300.

Choose the correct one from among the alternatives A,B,C,D after matching an item from Group 1 with the most appropriate item in Group 2.

Group 1 Group 2

P. Shift register 1. Frequency division

Q. Counter 2. Addressing in memory chips

R. Decoder 3. Serial to parallel data conversion

[1 mark]
(a) P – 3, Q – 2, R - 1
(b) P – 3, Q – 1, R - 2
(c) P – 2, Q – 1, R – 3
(d) P – 1, Q – 2, R - 2

asked in Electronics and Communication Engineering, 2004

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