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EC QUIZ -4
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Question 1
The transfer function 
of the circuit shown below is
of the circuit shown below is Question 2
In the circuit shown below β = 75. Calculate Q point (ICQ, VCEQ) is ___?
Question 3
Consider two signal x[n] = {1, 2, 3, 4, 5} and h[n] = {1}.
The convolution y[n] = x[n] * h[n] is
Question 4
A super heterodyne receiver operates in the frequency range of 58 MHz - 68 MHz. The intermediate frequency fIF and local oscillator frequency fLO are chosen such that
. It is required that the image frequencies fall outside the 58 MHz - 68 MHz band. The minimum required fIF(in MHz) is
. It is required that the image frequencies fall outside the 58 MHz - 68 MHz band. The minimum required fIF(in MHz) is Question 5
A series RL circuit is excited at t = 0 by closing a switch as shown in the figure. Assuming zero initial conditions, the value of 
at t = 0+ is
at t = 0+ is
Question 6
The input X to the Binary Symmetric Channel (BSC) shown in the figure is '1' with probability 0.8. The cross-over probability is 1/7. If the received bit Y= 0, the conditional probability that '1' was transmitted is ______.
Question 7
A trapezoidal display of modulated signal is shown in below figure.
Where
. The percentage modulation can be
Where
. The percentage modulation can be Question 8
In the voltage regulator circuit shown in the figure, the op-amp is ideal. The BJT has 
and 
and the zener voltage is 4.7 V. For a regulated output of 9 V, the value of R (in Ω) is _________.
and and the zener voltage is 4.7 V. For a regulated output of 9 V, the value of R (in Ω) is _________. Question 9
The figure below shows the doping distribution in a p-type semiconductor in log scale.
The magnitude of the electric field (in kV/cm) in the semiconductor due to non uniform doping is
The magnitude of the electric field (in kV/cm) in the semiconductor due to non uniform doping is
Question 10
Suppose that binary PSK is used for transmitting information over an AWGN with power spectral density of 
W/Hz. The transmitted signal energy is
W/Hz. The transmitted signal energy is
Where Tb is the bit interval A is signal amplitude. The bit error probability of the system is 10-6. If the data rate is 10 kbps, then the required signal amplitude is.......{Assume Q(4.74) = 10-6 }
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