ECE :: Exam Questions Paper
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The recursion relation to solve x = e-x using Newton Raphson method is
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In the circuit shown in the given figure the diode states at the extremely large negative values of the input voltage vi are :
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Consider a baseband binary PAM receiver shown below. The additive channel noise n(t) is whit with power spectral density SN(f) = N0/2 = 10-20 W/Hz. The low-pass filter is ideal with unity gain and cutoff frequency 1 MHz. Let Yk represent the random variable y(tk).
Yk = nNk if transmitted bit bk = 0
Yk = a + Nk if transmitted bit bk = 1
Where Nk represents the noise sample value. The noise sample has a probability density function, PNk(n) = 0.5ae-a|n| (This has mean zero and variance 2/a2). Assume transmitted bits to be equiprobable and threshold z is set to a/2 = 10-6 V.
The value of the parameter a (in V-1) is -
The probability density function of a random variable x is as shown.
The mean of the distribution is: -
The skin-depth of copper at a frequency of 3 GHz is 1 micron. At 12 GHz, for a non-magnetic conductor whose conductivity is
times of copper, the skin depth would be : -
If the z-transform of x(n) is given by
then the filter it represents is __________ . -
The system of linear equations 4x + 2y = 1 , 2x + y = 6 has
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Which of the following periodic waveforms will have only odd harmonics of sinusoidal waveform?
Select the correct option using the codes given below Codes: -
A control system is as shown in given figure The maximum value of gain K for which the system is stable is
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A transmitted using AM has in modulated carrier output power of 10 KW and can be modulated to a maximum depth of 90% by a sinusoidal modulating voltage without causing overloading. Find the value to which an modulated carrier power can be increased without resulting in overloading if the maximum permitted modulating index is 40%
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which is equal to power since mean is zero ⇒ 
.
, where T is the period and
and (1 + K) both should be + ve 
0 ∴ K should be more than - 1 and less than 5 
