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49.

If a signal f(t) has energy E, the energy of the signal f(2t) is equal to
[1 mark]
(a) E
(b) E/2
(c) 2E
(d) 4E

asked in Electronics and Communication Engineering, 2001

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50.

The PDF of a Gaussian random variable X is given by
. The probability of the event {X = 4} is [1 mark]
(a) 1/2
(b) 1/3√2π
(c) 0
(d) 1/4

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2001

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51.

A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through [1 mark]
(a) an RC filter
(b) an envelope detector
(c) a PLL
(d) an ideal low-pass filter with appropriate bandwidth

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2001

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52.

Let δ(t) denote the delta function. The value of the integral

[1 mark]
(a) 1
(b) -1
(c) 0
(d) π/2

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2001

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53.

The Nyquist plot for the open-loop transfer function G(s) of a unity negative feedback system is shown in figure if G(s) has no pole in the right half of splane, the number of roots of the system characteristic equation in the right half of s-plane is

[1 mark]
(a) 0
(b) 1
(c) 2
(d) 3

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2001

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54.

The root-locus diagram for a closed loop feedback system is shown in Figure. The system is overdamped.

[1 mark]
(a) only if 0 ≤ K ≤ 1
(b) only if 1 < K < 5
(c) only if K > 5
(d) if 0 ≤ K < 1 or K > 5

asked in Electronics and Communication Engineering, 2001

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